Frequently asked questions

We've shared the answers to some of the most frequently asked questions about boilers, heating systems, servicing and maintenance. Can't find the answer? Contact us and we'll do our best to help.


Check out our glossary of heating terms to help you find what you are looking for.

Categories

  • All FAQs
  • Winter Advice
  • Troubleshooting
  • Flood Advice
  • Boiler Servicing
  • Gas Safety
  • General Boiler Info
  • Parts Advice
  • Energy Saving Tips
  • Benchmark
  • Future of Home Heating

All FAQs

Grants for heat pumps

Future of Home heating

Check out if there are grants available in your area to help with the cost of installing air source heat pump

Living with an air source heat pump

Future of Home heating

Is a heat pump right for me? Can a heat pump provide hot water? How efficient is a heat pump? We answer your questions about living with an air source heat pump

Getting my home ready for an air source heat pump

Future of Home heating

We explain the energy saving work needed before you fit an air source heat pump, where in your home you can have it and who can install it

How do air source heat pumps work

Future of Home heating

What are heat pumps

Future of Home heating

What are heat pumps? We explain what an air source heat pump and a ground source heat pump is. 

Boiler Upgrade Scheme

General Boiler info, Future of home heating, Energy Saving Tips

The government boiler upgrade scheme was launched in April 2022. It will provide a boiler upgrade grant to help owners of domestic and small non-domestic properties in England or Wales with the upfront cost of installing low carbon heating systems, such as heat pumps. It will run from 2022 to 2025.

Why should I get the water in my central heating system cleaned?

General Boiler info

If sludge is allowed to build up, it can result in blocked pipes, inefficient radiators and damaged parts in the boiler.  The heat exchanger in a boiler consists of many narrow pipes which the water passes through to heat up.  If the narrow pipes become restricted or blocked, the boiler will shut down to prevent it from overheating and getting even more damaged.  If the boiler breaks down because of sludge in the system, the repair work is not covered by the boiler warranty and could lead to expensive repair bills.

How do I know if I've got sludge in my central heating system?

Boiler Servicing

The common signs of sludge in the central heating system are:

  • Radiators are hot at the top, but cold at the bottom
  • Radiators require bleeding more frequently
  • Pipework to the radiators get hot, but the radiators themselves do not
  • Some radiators do not heat up to the required temperature, even when the temperature is turned up
  • The boiler pump leaks or fails
  • When boiler parts are removed or replaced, they are full of dirt
  • The water pipe coming out of the boiler (the flow) is hot but water pipe coming back to the boiler (the return) is lukewarm or cold
  • The system is noisy – it gurgles and ‘kettles’ (the term kettling means exactly what it sounds like – your system whistles, pops and bubbles, just like a kettle does when it is boiling)

What is central heating sludge?

General Boiler info

Sludge, or magnetite, to give it its proper name, is a black substance in the central heating pipes made up of dissolved and rusted metal.  It forms when the water in the system reacts with the metal in radiators and pipes.

Because sludge is heavier than water, it can settle in radiators and pipework and, if left to build up, it can damage the boiler and the system.

Is it worth having a magnetic filter fitted?

General Boiler info

Replacing your boiler is a major investment and you want to know that you can rely on it to give you heating and hot water for many years.  A boiler filter will catch dirt and debris in your central heating system before the water enters your boiler. This will help to prevent sludge building up in pipes and your radiators, which would make your boiler lose efficiency and could lead to higher energy bills.

Does my filter need cleaning and how do I get my filter cleaned?

General Boiler info

The sludge that your magnetic filter collects will need to be removed because once the filter is filled up, it can’t catch any more debris.  It will still allow the water to pass through, but will not collect any more sludge.

How is a filter fitted and can I get one fitted for my existing boiler?

General Boiler info

Your installer should fit a magnetic filter on the pipe that is returning the water to your boiler after it has been round the central heating system. This will prevent any debris that has been picked up on the circuit from entering your boiler. From 15th June 2022, having a magnetic filter fitted will be a requirement of the Building Regulations when you have a new boiler installed.

Why should I have a filter fitted and will having a magnetic water filter save me money?

General Boiler info, Boiler Servicing

Many boiler breakdowns that occur are due to sludge in the heating system. This ‘sludge’ (which is also known as magnetite) is caused by fragments of rust and other debris in the pipes that accumulates over time and, if left, can cause cold patches on your radiators, make your boiler work harder to heat your home and also can block or damage the components inside your boiler.

Do I have to have a magnetic boiler filter installed?

Boiler Servicing, General Boiler info

Fitting a filter is considered Best Practice when installing a new boiler and is already included in a document called BS7593:2019 – Code of practice for the preparation, commissioning and maintenance of domestic central heating and cooling water systems.

What is a magnetic boiler filter?

Boiler Servicing

The water in your central heating system flows from your boiler, where it is heated up, around all your radiators and then back to the boiler to be reheated and circulate again. A magnetic boiler filter is a small device that is installed into the pipework close to where the water goes back into your boiler.

Why is the government banning natural gas

Future of Home Heating

In order for the UK to meet the government’s target of net zero emissions by 2050, the way we heat our homes will have to change.  The Government is planning to prevent the use of natural gas for heating new build homes in an effort to reduce carbon emissions.

Can I still replace my old gas boiler

Future of Home Heating

Yes, you can replace your existing gas boiler and no, you don’t have to do this before 2025. There is talk that only gas boilers that are ‘hydrogen ready’, i.e., they can be adapted easily and quickly to work on a 100% hydrogen supply

Are gas boilers going to be banned

Future of Home Heating

Gas boilers will not be banned from 2025. However, from 2025 new build properties could be required to have low carbon heating, such as a heat pump, 

What alternatives are there to gas boilers

Future of Home Heating

There are a number of alternative heating systems, both available now or currently in development. Electric boilers, heat pumps and heat networks are already

Are you developing a heat pump

Future of Home Heating

Our highly experienced team of experts is at the cutting edge of heat pump technology. Focused on quality, safety, and performance, we are helping to advance the use of heat pumps in residential and commercial buildings.

What is Net zero carbon

Future of Home Heating

Net zero carbon is when the amount of carbon dioxide we add to the atmosphere is the same or less than as the amount taken out of the atmosphere.  Achieving net

Why are hydrogen boilers being developed

Future of Home Heating

Natural gas is a fossil fuel and is contributing to the climate change crisis. Manufacturers and government are working together to find solutions that reduce our dependence on fossil fuels and one of these is to repurpose the gas grid for transporting hydrogen

Top tips for energy saving in the home

Energy Saving Tips

By following Baxi’s top tips for reducing energy consumption, it’s possible to protect pockets and make our homes more efficient in the process.

Should you turn off your boiler in summer

General boiler info, Troubleshooting

Is it ok to turn off your boiler in summer? The short answer is: it depends on your home and your circumstances. Let’s go through those circumstances, and see which ones apply to you, so you know ‘what to do with your boiler in the summer?'

Tips to make sure your boiler is ready for winter

General boiler info, Winter Advice

As the nights draw in and the days get cooler, your boiler’s workload increases significantly. However, you may not have had your heating on for months. Ageing pipes, lower boiler pressure, grime building up inside your central heating system – there’s plenty that can happen over time that can reduce the effectiveness or even damage your boiler.

How to bleed a radiator?

General boiler info, Winter Advice, Troubleshooting

Is your home not heating up as much as you’d like? Have you turned up your thermostat higher than you normally would? There’s a good chance that your radiators are not as efficient as they could be. A common cause of this is air trapped inside the heating system – and this is when to bleed your radiators.

Water from boiler too hot? Here is how to fix it

General boiler info, Troubleshooting

When it comes to hot water temperature, everyone has a different preference on what’s ideal. Some like it hot, some like it too hot, and some like it warm. This guide is to help you set the right water temperature, and using BAXI boiler temperature settings to get your water temperature to your exact liking.

Even if you don’t have a BAXI boiler, we want to help you set your water temperature to what is most comfortable for you and everyone in your home. Most boilers have temperature controls, whether they’re combi boilers, heat-only boilers, or system boilers.

Why is my radiator cold?

General boiler info, Troubleshooting

The most likely explanation for this is that there are bubbles of air trapped inside your radiator. Fortunately, this is the simplest issue to solve. All you need to do is bleed your radiator.

This can be done with only a radiator key, an old towel or rag or bucket to catch any water that comes out of the radiator. You can find out how to do this in our in-depth guide on how to bleed your radiator.

What temperature should a boiler be set at?

General boiler info, Winter Advice, Troubleshooting

Central heating systems are pretty complex. They keep your water hot and your home comfortable all day, every day. Plus, they need to last a long time. So, when you’re trying to work out what is the best temperature setting for central heating, you need to understand your boiler and its controls and settings.

No hot water? What to check

General boiler info, Winter Advice, Troubleshooting

Waking up or coming home to find the hot water not working… is one of those things you could have done without today. Don’t let it ruin your day! We’re here to help you find out what causes hot water to stop working, and sort it out.

How to diagnose a leaking boiler

General Boiler info, Troubleshooting

If you’ve found water leaking from your boiler, the important thing is not to panic. We’ll help you diagnose the issue, and then show you what needs to be done. We have plenty of advice on boilers: how long they last, when they need replacing, and what you can do to make them last longer.

How to look after your boiler in the summer

General Boiler Info

Just like you would check your car’s oil, brake pads and spark plugs to make sure it’s running safely and efficiently, it’s the perfect time to get your boiler checked over too. Read our top tips for your boiler’s summer maintenance here. 

How much does a new boiler cost?

General Boiler Info

How much a new boiler costs will depends on a number of things, including the model, output and installation of the boiler. Read our advice here.

How long does a boiler last?

General Boiler Info

We understand that buying a new boiler is a big investment, and you need to be sure of getting it right. Your boiler is also the heart of your home so it’s vital you make the right choice when the time comes to replace it. Read our advice on how long a boiler lasts, how to maintain it and when to consider getting a new one.

What is Flue Gas Heat Recovery?

General Boiler Info

A FGHR device that uses recycled heat when heating up the incoming cold water, lowering the amount of energy needed to warm the water up. Read more to find out how FGHR works and the benefits. 

Why is my boiler pressure low?

Boiler maintenance and advice

The pressure on your boiler can go up or down for different reasons. Whether you have high or low boiler pressure, we explain how to adjust it and what to do if your boiler keeps losing pressure.

Are carbon monoxide detectors (CO alarms) required by law?

Gas safety

Currently, carbon monoxide detectors (CO alarms) for gas appliances are not required by law, in either privately owned, private rented or social housing.

How do I top up the water pressure?

Trouble Shooting

Sometimes boilers need to be repressurised. This is quite normal and you can repressurise your boiler yourself. Our videos show you how, whether you have a rigid or a flexible filling loop, or Easy-Fill permanent filling link.

Tips for saving energy around the home

Energy Saving Tips

Here are our suggestions for things we can all do around the home that won’t cost anything at all, but that could help to reduce our energy bills.

How to stay safe during the floods

Flood advice

With serious flooding in some areas of the UK, boilers and central heating systems may not be your first consideration, yet when the floods subside there are some important things to consider to help keep you and your family safe.

The Baxi uSense smart room thermostat

Smart room thermostat

Baxi uSense is compatible with all combi boilers using the 230V switch live. Additional features, such as boiler fault diagnosis, are enabled when connected via OpenTherm.

The following Baxi boilers are OpenTherm compatible:

Baxi 800

Baxi 600

Baxi 400

Baxi 200

How to book a boiler service online

Boiler Servicing

If you have a Domestic & General Maintenance & Support plan, please follow our 3 simple steps to book your boiler service online.

Top tips for maintaining your boiler

Boiler Servicing

There are a few simple maintenance jobs you can do yourself to keep it in tip top condition.

What are the benefits of a boiler service

Boiler Servicing

Regular servicing can keep you and your family safe, save you money and keep your warranty valid. Click to read more on the benefits of a boiler service.

How to protect your boiler this winter

Winter advice

Here are some steps you can take to protect your boiler and keep yourself, and your dear ones, warm and cosy, even during the coldest weather.

What is Benchmark?

Benchmark

Benchmark is a nationally recognised scheme that gives manufacturers and installers the responsibility for ensuring best practice for the installation, commissioning and servicing of domestic heating and hot water products, in accordance with the Building Regulations in England and Wales. 

How to thaw a frozen boiler condensate pipe

Winter Advice

If your boiler has stopped working in below zero temperatures, then it is likely your condensate pipe has frozen. Luckily it is quite simple to thaw and get your boiler up and running again without the need for an engineer. Follow our simple steps to get your boiler working again.

My boiler keeps losing pressure. What should I do?

Troubleshooting

The pressure on your boiler can go up or down for different reasons. Whether you have high or low boiler pressure, we explain how to adjust it and what to do if your boiler keeps losing pressure.

What’s wrong with my boiler? Try our basic boiler checks

Trouble Shooting

This five part basic checks video series can help you identify and repair basic boiler faults, problems, issues and error codes, helping you save time and money.

Click through to view our videos.

Where is safe to install a boiler?

General boiler info

You can have your boiler installed safely in most rooms, or even the loft. There are, however a few things to consider.

What is a gas safety certificate?

Gas Safety

Under The Gas Safety (Installation and Use) Regulations 1998, owners of residential rented properties must arrange a gas safety check by a Gas Safe registered engineer for all pipework, appliances and flues in each of the properties which the landlord owns and provides for tenants to use.

What is a condensing boiler?

General boiler info

The difference between an old non-condensing boiler and a new condensing model is the amount of useable heat it produces from the fuel it burns.

What is a back boiler?

General boiler info

Back boilers (also known as back boiler units or BBUs) became popular in 1966 with the launch of the original Baxi Bermuda. A back boiler is a small, compact boiler fitted at the back of an open fireplace hearth. It sits behind a gas fire and provides hot water and central heating to the property.

Click to find out everything you need to know about replacing a back boiler.

What do Baxi error codes E133 or E28 mean?

Troubleshooting

If your boiler has shut down and is showing error code E133 or E28, then your condensate pipe may be frozen.

What do Baxi error codes mean?

Troubleshooting

If your boiler develops a problem, it will often display an error code on the control panel that will help you or your Gas Safe registered installer identify what went wrong.

Water treatment explained: How to keep your heating system healthy

Boiler servicing

Buying a new boiler is a big investment, and not taken lightly, whether it’s a distress purchase because your old boiler has broken down and can’t be repaired, you have extended your home and need a bigger boiler to cope with more radiators or you are concerned about your carbon footprint and want to be more energy efficient.

Can I run a bath and shower at the same time?

General boiler info

If you have a hot water storage cylinder, usually found in the airing cupboard, you should be able to run a bath and have a shower at the same time.

How do I maintain a boiler flue in the ceiling?

General boiler info

If you live in a property that has a boiler flue which cannot be inspected because it is hidden behind a wall or ceiling, you need to install an inspection hatch.

How to reset a Baxi boiler

Troubleshooting

If your boiler needs to be reset, these videos show you how, whether your boiler has a dedicated reset button, an ON/OFF/SELECTOR switch or a thermostat control knob.

Bleed a radiator in 8 easy steps

Troubleshooting

If you have cold spots at the top of your radiators, it means that there is trapped air that needs to be removed so your radiators will heat your room efficiently.

Follow our 8 simple steps on how to bleed a radiator.

How old is my boiler?

General boiler info

To find out how old your boiler is, visit the official industry database Fill in details of your boiler and the dates when manufacture of that model began and ended will be displayed. You can search for all brands and models of boilers in this database. Or you can look at your boiler’s serial number. This can usually be found on the drop down panel on the front. The serial number has all the information needed for us to tell you when your boiler was manufactured. Contact us with the details.

What happens at a boiler service?

Boiler servicing

Getting your boiler serviced every year is a bit like getting your car serviced. The law requires that all servicing and gas safety checks are made by a Gas Safe registered engineer and an annual service can make all the difference in reliability, efficiency and household bills. If your boiler is still under warranty, having an annual service is a condition of the warranty. Always ask to see the engineer’s Gas Safe ID.

How often should I have my boiler serviced?

Boiler servicing

Getting your boiler serviced every year is a bit like getting your car serviced. The law requires that all servicing and gas safety checks are made by a Gas Safe registered engineer and an annual service can make all the difference in reliability, efficiency and household bills. If your boiler is still under warranty, having an annual service is a condition of the warranty. Always ask to see the engineer’s Gas Safe ID.

How energy efficient is my boiler?

Energy Saving Tips

As one of the biggest costs for householders in the UK, it is worth understanding how energy efficient your boiler is, and how much you could save if you replaced it with a new high efficiency model.

In April 2018, the Building Regulations changed again, requiring all new boilers to be at least ErP 92% efficient.

How does a system boiler work?

General boiler info

A system boiler, or sealed system, is a great option if you have more than one bathroom or your household has a high demand for hot water.

How does a heat only boiler work?

General boiler info

Heat only boilers are also known as conventional, traditional, open vent or regular boilers.

How does a combi boiler work?

General boiler info

Combi, or combination boilers are the most popular type of domestic boiler sold in the UK.

How do I maintain the pilot light?

Troubleshooting

If you have an older boiler (SEDBUK Band G), you should regularly check its pilot light, a small naked flame inside the boiler that you can see through a small hole covered by glass.

Do I need a carbon monoxide detector for a gas boiler?

Gas Safety

Your carbon monoxide detector could save your and your family’s lives, so it is vital you install them in the best place to protect you from this poisonous gas. Here we answer some frequently asked questions about carbon monoxide (CO); what is carbon monoxide, what are the signs of carbon monoxide poisoning, where to place a carbon monoxide detector and more to keep you and your family safe.

Which Baxi boiler do I have?

General boiler info

The easiest way to find out which Baxi boiler you have is by looking at the instructions that came with it. It is always worth keeping these in a safe place, because they also include the Benchmark Checklist that your installer should have carried out when they fitted the boiler and also the boiler’s service history, which should be completed by the engineer when they carry out your annual service.

However, if you no longer have the instruction booklet you can find the serial number here.

What are the different types of boilers?

General boiler info

We explain about the different types of boiler and their pros and cons, so you can make an informed decision on which type of boiler you need when you come to replace yours.

Where can I find the serial number of my boiler?

Boiler servicing

The serial number can usually be found on the drop down panel on the front of the boiler. Some boilers have a tag underneath the boiler that slides out to reveal the serial number. If you can’t find your serial number, call Baxi Customer Support 0330 678 0917 with the name of your boiler and they will help you find it.

Baxi Genuine Parts

Parts Advice

It might be difficult to tell the difference between a counterfeit part being installed into your boiler and a genuine part, but this could make a real difference to the running of your home heating system.

We recommend always asking your installer to use Baxi Genuine Parts, because they have been tested and approved for use in Baxi boilers.

What should the pressure gauge on my boiler be reading?

Troubleshooting

The normal operating water pressure for your boiler and central heating system is between 1.0 and 2.0 bar. If the pressure drops below 1.0 bar, you need to repressurise it. If the pressure goes above 3.0 bar, you will see water coming from the pressure relief valve (usually on an outside wall). You can reduce the pressure by bleeding a radiator or draining some water out of the system using a drain point, usually found underneath a radiator.

Boiler pressure too high? We explain how to fix it

Troubleshooting

If your boiler pressure is too high, it could be because a radiator has been removed, for example, while decorating a room, and the system was over-filled when it was replaced. If the water pressure continues to be high after bleeding the radiators, please call your heating engineer, or Baxi Customer Support on 0330 678 0917 to check the system is safe to use.

What does Boiler Plus mean to you?

General Boiler Info

The part of the Building Regulations that deals with central heating boilers is undergoing the biggest change since the introduction of condensing boilers in 2005. The change, commonly known as Boiler Plus, affects you when your old boiler is replaced, or you have a new boiler installed where there wasn’t one before.

The new law becomes effective on 6 April 2018 and applies to homes in England only.

Carbon monoxide (CO) advice

Gas Safety

Carbon monoxide (CO) is a toxic gas produced by the incomplete combustion of fossil fuels including gas, oil, wood and coal used in boilers, engines, oil burners, gas fires, water heaters, gas ovens, solid fuel appliances and open fires.

It can occur when a gas appliance has been incorrectly fitted, badly repaired or poorly maintained. It can also occur if flues, chimneys or vents are blocked.

It is colourless, odourless and tasteless, so the best way to detect carbon monoxide is to fit a CO alarm.

How do I get my central heating system cleaned?

General Boiler info

If your radiators have cold patches at the bottom and you need to bleed them more regularly or your central heating system is making more noise than usual, be sure to tell your Gas Safe registered heating engineer when they come to give your boiler its annual service.

Are Baxi customer support engineers Gas Safe registered?

Gas Safety

Yes, our nationwide network of Baxi Customer Support engineers are employed by Baxi and are Gas Safe registered.

Winter Advice

How to protect your boiler this winter

Winter advice

Here are some steps you can take to protect your boiler and keep yourself, and your dear ones, warm and cosy, even during the coldest weather.

How to thaw a frozen boiler condensate pipe

Winter Advice

If your boiler has stopped working in below zero temperatures, then it is likely your condensate pipe has frozen. Luckily it is quite simple to thaw and get your boiler up and running again without the need for an engineer. Follow our simple steps to get your boiler working again.

Tips to make sure your boiler is ready for winter

General boiler info, Winter Advice

As the nights draw in and the days get cooler, your boiler’s workload increases significantly. However, you may not have had your heating on for months. Ageing pipes, lower boiler pressure, grime building up inside your central heating system – there’s plenty that can happen over time that can reduce the effectiveness or even damage your boiler.

Top tips for energy saving in the home

Energy Saving Tips

By following Baxi’s top tips for reducing energy consumption, it’s possible to protect pockets and make our homes more efficient in the process.

What temperature should a boiler be set at?

General boiler info, Winter Advice, Troubleshooting

Central heating systems are pretty complex. They keep your water hot and your home comfortable all day, every day. Plus, they need to last a long time. So, when you’re trying to work out what is the best temperature setting for central heating, you need to understand your boiler and its controls and settings.

No hot water? What to check

General boiler info, Winter Advice, Troubleshooting

Waking up or coming home to find the hot water not working… is one of those things you could have done without today. Don’t let it ruin your day! We’re here to help you find out what causes hot water to stop working, and sort it out.

How to bleed a radiator?

General boiler info, Winter Advice, Troubleshooting

Is your home not heating up as much as you’d like? Have you turned up your thermostat higher than you normally would? There’s a good chance that your radiators are not as efficient as they could be. A common cause of this is air trapped inside the heating system – and this is when to bleed your radiators.

Trouble Shooting

What’s wrong with my boiler? Try our basic boiler checks

Trouble Shooting

This five part basic checks video series can help you identify and repair basic boiler faults, problems, issues and error codes, helping you save time and money.

Click through to view our videos.

How do I top up the water pressure?

Trouble Shooting

Sometimes boilers need to be repressurised. This is quite normal and you can repressurise your boiler yourself. Our videos show you how, whether you have a rigid or a flexible filling loop, or Easy-Fill permanent filling link.

Flood Advice

How to stay safe during the floods

Flood advice

With serious flooding in some areas of the UK, boilers and central heating systems may not be your first consideration, yet when the floods subside there are some important things to consider to help keep you and your family safe.

Boiler Servicing

How do I know if I've got sludge in my central heating system?

Boiler Servicing

The common signs of sludge in the central heating system are:

  • Radiators are hot at the top, but cold at the bottom
  • Radiators require bleeding more frequently
  • Pipework to the radiators get hot, but the radiators themselves do not
  • Some radiators do not heat up to the required temperature, even when the temperature is turned up
  • The boiler pump leaks or fails
  • When boiler parts are removed or replaced, they are full of dirt
  • The water pipe coming out of the boiler (the flow) is hot but water pipe coming back to the boiler (the return) is lukewarm or cold
  • The system is noisy – it gurgles and ‘kettles’ (the term kettling means exactly what it sounds like – your system whistles, pops and bubbles, just like a kettle does when it is boiling)

Where can I find the serial number of my boiler?

Boiler servicing

The serial number can usually be found on the drop down panel on the front of the boiler. Some boilers have a tag underneath the boiler that slides out to reveal the serial number. If you can’t find your serial number, call Baxi Customer Support 0330 678 0917 with the name of your boiler and they will help you find it.

Water treatment explained: How to keep your heating system healthy

Boiler servicing

Buying a new boiler is a big investment, and not taken lightly, whether it’s a distress purchase because your old boiler has broken down and can’t be repaired, you have extended your home and need a bigger boiler to cope with more radiators or you are concerned about your carbon footprint and want to be more energy efficient.

How to book a boiler service online

Boiler Servicing

If you have a Domestic & General Maintenance & Support plan, please follow our 3 simple steps to book your boiler service online.

Top tips for maintaining your boiler

Boiler Servicing

There are a few simple maintenance jobs you can do yourself to keep it in tip top condition.

What are the benefits of a boiler service

Boiler Servicing

Regular servicing can keep you and your family safe, save you money and keep your warranty valid. Click to read more on the benefits of a boiler service.

What happens at a boiler service?

Boiler servicing

Getting your boiler serviced every year is a bit like getting your car serviced. The law requires that all servicing and gas safety checks are made by a Gas Safe registered engineer and an annual service can make all the difference in reliability, efficiency and household bills. If your boiler is still under warranty, having an annual service is a condition of the warranty. Always ask to see the engineer’s Gas Safe ID.

How often should I have my boiler serviced?

Boiler servicing

Getting your boiler serviced every year is a bit like getting your car serviced. The law requires that all servicing and gas safety checks are made by a Gas Safe registered engineer and an annual service can make all the difference in reliability, efficiency and household bills. If your boiler is still under warranty, having an annual service is a condition of the warranty. Always ask to see the engineer’s Gas Safe ID.

What is a magnetic boiler filter?

Boiler Servicing

The water in your central heating system flows from your boiler, where it is heated up, around all your radiators and then back to the boiler to be reheated and circulate again. A magnetic boiler filter is a small device that is installed into the pipework close to where the water goes back into your boiler.

Why should I have a filter fitted and will having a magnetic water filter save me money?

General Boiler info, Boiler Servicing

Many boiler breakdowns that occur are due to sludge in the heating system. This ‘sludge’ (which is also known as magnetite) is caused by fragments of rust and other debris in the pipes that accumulates over time and, if left, can cause cold patches on your radiators, make your boiler work harder to heat your home and also can block or damage the components inside your boiler.

Do I have to have a magnetic boiler filter installed?

Boiler Servicing, General Boiler info

Fitting a filter is considered Best Practice when installing a new boiler and is already included in a document called BS7593:2019 – Code of practice for the preparation, commissioning and maintenance of domestic central heating and cooling water systems.

Gas Safety

Do I need a carbon monoxide detector for a gas boiler?

Gas Safety

Your carbon monoxide detector could save your and your family’s lives, so it is vital you install them in the best place to protect you from this poisonous gas. Here we answer some frequently asked questions about carbon monoxide (CO); what is carbon monoxide, what are the signs of carbon monoxide poisoning, where to place a carbon monoxide detector and more to keep you and your family safe.

What is a gas safety certificate?

Gas Safety

Under The Gas Safety (Installation and Use) Regulations 1998, owners of residential rented properties must arrange a gas safety check by a Gas Safe registered engineer for all pipework, appliances and flues in each of the properties which the landlord owns and provides for tenants to use.

Are Baxi customer support engineers Gas Safe registered?

Gas Safety

Yes, our nationwide network of Baxi Customer Support engineers are employed by Baxi and are Gas Safe registered.

Are carbon monoxide detectors (CO alarms) required by law?

Gas safety

Currently, carbon monoxide detectors (CO alarms) for gas appliances are not required by law, in either privately owned, private rented or social housing.

Carbon monoxide (CO) advice

Gas Safety

Carbon monoxide (CO) is a toxic gas produced by the incomplete combustion of fossil fuels including gas, oil, wood and coal used in boilers, engines, oil burners, gas fires, water heaters, gas ovens, solid fuel appliances and open fires.

It can occur when a gas appliance has been incorrectly fitted, badly repaired or poorly maintained. It can also occur if flues, chimneys or vents are blocked.

It is colourless, odourless and tasteless, so the best way to detect carbon monoxide is to fit a CO alarm.

General Boiler Info

How does a combi boiler work?

General boiler info

Combi, or combination boilers are the most popular type of domestic boiler sold in the UK.

How do I maintain a boiler flue in the ceiling?

General boiler info

If you live in a property that has a boiler flue which cannot be inspected because it is hidden behind a wall or ceiling, you need to install an inspection hatch.

Can I run a bath and shower at the same time?

General boiler info

If you have a hot water storage cylinder, usually found in the airing cupboard, you should be able to run a bath and have a shower at the same time.

Which Baxi boiler do I have?

General boiler info

The easiest way to find out which Baxi boiler you have is by looking at the instructions that came with it. It is always worth keeping these in a safe place, because they also include the Benchmark Checklist that your installer should have carried out when they fitted the boiler and also the boiler’s service history, which should be completed by the engineer when they carry out your annual service.

However, if you no longer have the instruction booklet you can find the serial number here.

What are the different types of boilers?

General boiler info

We explain about the different types of boiler and their pros and cons, so you can make an informed decision on which type of boiler you need when you come to replace yours.

How does a system boiler work?

General boiler info

A system boiler, or sealed system, is a great option if you have more than one bathroom or your household has a high demand for hot water.

What is a back boiler?

General boiler info

Back boilers (also known as back boiler units or BBUs) became popular in 1966 with the launch of the original Baxi Bermuda. A back boiler is a small, compact boiler fitted at the back of an open fireplace hearth. It sits behind a gas fire and provides hot water and central heating to the property.

Click to find out everything you need to know about replacing a back boiler.

How old is my boiler?

General boiler info

To find out how old your boiler is, visit the official industry database Fill in details of your boiler and the dates when manufacture of that model began and ended will be displayed. You can search for all brands and models of boilers in this database. Or you can look at your boiler’s serial number. This can usually be found on the drop down panel on the front. The serial number has all the information needed for us to tell you when your boiler was manufactured. Contact us with the details.

What does Boiler Plus mean to you?

General Boiler Info

The part of the Building Regulations that deals with central heating boilers is undergoing the biggest change since the introduction of condensing boilers in 2005. The change, commonly known as Boiler Plus, affects you when your old boiler is replaced, or you have a new boiler installed where there wasn’t one before.

The new law becomes effective on 6 April 2018 and applies to homes in England only.

What is a condensing boiler?

General boiler info

The difference between an old non-condensing boiler and a new condensing model is the amount of useable heat it produces from the fuel it burns.

Where is safe to install a boiler?

General boiler info

You can have your boiler installed safely in most rooms, or even the loft. There are, however a few things to consider.

Is it worth having a magnetic filter fitted?

General Boiler info

Replacing your boiler is a major investment and you want to know that you can rely on it to give you heating and hot water for many years.  A boiler filter will catch dirt and debris in your central heating system before the water enters your boiler. This will help to prevent sludge building up in pipes and your radiators, which would make your boiler lose efficiency and could lead to higher energy bills.

How is a filter fitted and can I get one fitted for my existing boiler?

General Boiler info

Your installer should fit a magnetic filter on the pipe that is returning the water to your boiler after it has been round the central heating system. This will prevent any debris that has been picked up on the circuit from entering your boiler. From 15th June 2022, having a magnetic filter fitted will be a requirement of the Building Regulations when you have a new boiler installed.

How to look after your boiler in the summer

General Boiler Info

Just like you would check your car’s oil, brake pads and spark plugs to make sure it’s running safely and efficiently, it’s the perfect time to get your boiler checked over too. Read our top tips for your boiler’s summer maintenance here. 

How much does a new boiler cost?

General Boiler Info

How much a new boiler costs will depends on a number of things, including the model, output and installation of the boiler. Read our advice here.

Does my filter need cleaning and how do I get my filter cleaned?

General Boiler info

The sludge that your magnetic filter collects will need to be removed because once the filter is filled up, it can’t catch any more debris.  It will still allow the water to pass through, but will not collect any more sludge.

What is central heating sludge?

General Boiler info

Sludge, or magnetite, to give it its proper name, is a black substance in the central heating pipes made up of dissolved and rusted metal.  It forms when the water in the system reacts with the metal in radiators and pipes.

Because sludge is heavier than water, it can settle in radiators and pipework and, if left to build up, it can damage the boiler and the system.

Why should I get the water in my central heating system cleaned?

General Boiler info

If sludge is allowed to build up, it can result in blocked pipes, inefficient radiators and damaged parts in the boiler.  The heat exchanger in a boiler consists of many narrow pipes which the water passes through to heat up.  If the narrow pipes become restricted or blocked, the boiler will shut down to prevent it from overheating and getting even more damaged.  If the boiler breaks down because of sludge in the system, the repair work is not covered by the boiler warranty and could lead to expensive repair bills.

How long does a boiler last?

General Boiler Info

We understand that buying a new boiler is a big investment, and you need to be sure of getting it right. Your boiler is also the heart of your home so it’s vital you make the right choice when the time comes to replace it. Read our advice on how long a boiler lasts, how to maintain it and when to consider getting a new one.

What is Flue Gas Heat Recovery?

General Boiler Info

A FGHR device that uses recycled heat when heating up the incoming cold water, lowering the amount of energy needed to warm the water up. Read more to find out how FGHR works and the benefits. 

How do I get my central heating system cleaned?

General Boiler info

If your radiators have cold patches at the bottom and you need to bleed them more regularly or your central heating system is making more noise than usual, be sure to tell your Gas Safe registered heating engineer when they come to give your boiler its annual service.

How does a heat only boiler work?

General boiler info

Heat only boilers are also known as conventional, traditional, open vent or regular boilers.

Should you turn off your boiler in summer

General boiler info, Troubleshooting

Is it ok to turn off your boiler in summer? The short answer is: it depends on your home and your circumstances. Let’s go through those circumstances, and see which ones apply to you, so you know ‘what to do with your boiler in the summer?'

Water from boiler too hot? Here is how to fix it

General boiler info, Troubleshooting

When it comes to hot water temperature, everyone has a different preference on what’s ideal. Some like it hot, some like it too hot, and some like it warm. This guide is to help you set the right water temperature, and using BAXI boiler temperature settings to get your water temperature to your exact liking.

Even if you don’t have a BAXI boiler, we want to help you set your water temperature to what is most comfortable for you and everyone in your home. Most boilers have temperature controls, whether they’re combi boilers, heat-only boilers, or system boilers.

Why is my radiator cold?

General boiler info, Troubleshooting

The most likely explanation for this is that there are bubbles of air trapped inside your radiator. Fortunately, this is the simplest issue to solve. All you need to do is bleed your radiator.

This can be done with only a radiator key, an old towel or rag or bucket to catch any water that comes out of the radiator. You can find out how to do this in our in-depth guide on how to bleed your radiator.

How to diagnose a leaking boiler

General Boiler info, Troubleshooting

If you’ve found water leaking from your boiler, the important thing is not to panic. We’ll help you diagnose the issue, and then show you what needs to be done. We have plenty of advice on boilers: how long they last, when they need replacing, and what you can do to make them last longer.

Tips to make sure your boiler is ready for winter

General boiler info, Winter Advice

As the nights draw in and the days get cooler, your boiler’s workload increases significantly. However, you may not have had your heating on for months. Ageing pipes, lower boiler pressure, grime building up inside your central heating system – there’s plenty that can happen over time that can reduce the effectiveness or even damage your boiler.

Why should I have a filter fitted and will having a magnetic water filter save me money?

General Boiler info, Boiler Servicing

Many boiler breakdowns that occur are due to sludge in the heating system. This ‘sludge’ (which is also known as magnetite) is caused by fragments of rust and other debris in the pipes that accumulates over time and, if left, can cause cold patches on your radiators, make your boiler work harder to heat your home and also can block or damage the components inside your boiler.

Do I have to have a magnetic boiler filter installed?

Boiler Servicing, General Boiler info

Fitting a filter is considered Best Practice when installing a new boiler and is already included in a document called BS7593:2019 – Code of practice for the preparation, commissioning and maintenance of domestic central heating and cooling water systems.

What temperature should a boiler be set at?

General boiler info, Winter Advice, Troubleshooting

Central heating systems are pretty complex. They keep your water hot and your home comfortable all day, every day. Plus, they need to last a long time. So, when you’re trying to work out what is the best temperature setting for central heating, you need to understand your boiler and its controls and settings.

No hot water? What to check

General boiler info, Winter Advice, Troubleshooting

Waking up or coming home to find the hot water not working… is one of those things you could have done without today. Don’t let it ruin your day! We’re here to help you find out what causes hot water to stop working, and sort it out.

How to bleed a radiator?

General boiler info, Winter Advice, Troubleshooting

Is your home not heating up as much as you’d like? Have you turned up your thermostat higher than you normally would? There’s a good chance that your radiators are not as efficient as they could be. A common cause of this is air trapped inside the heating system – and this is when to bleed your radiators.

Boiler Upgrade Scheme

General Boiler info, Future of home heating, Energy Saving Tips

The government boiler upgrade scheme was launched in April 2022. It will provide a boiler upgrade grant to help owners of domestic and small non-domestic properties in England or Wales with the upfront cost of installing low carbon heating systems, such as heat pumps. It will run from 2022 to 2025.

Parts Advice

Baxi Genuine Parts

Parts Advice

It might be difficult to tell the difference between a counterfeit part being installed into your boiler and a genuine part, but this could make a real difference to the running of your home heating system.

We recommend always asking your installer to use Baxi Genuine Parts, because they have been tested and approved for use in Baxi boilers.

Energy Saving Tips

Tips for saving energy around the home

Energy Saving Tips

Here are our suggestions for things we can all do around the home that won’t cost anything at all, but that could help to reduce our energy bills.

How energy efficient is my boiler?

Energy Saving Tips

As one of the biggest costs for householders in the UK, it is worth understanding how energy efficient your boiler is, and how much you could save if you replaced it with a new high efficiency model.

In April 2018, the Building Regulations changed again, requiring all new boilers to be at least ErP 92% efficient.

Top tips for energy saving in the home

Energy Saving Tips

By following Baxi’s top tips for reducing energy consumption, it’s possible to protect pockets and make our homes more efficient in the process.

Boiler Upgrade Scheme

General Boiler info, Future of home heating, Energy Saving Tips

The government boiler upgrade scheme was launched in April 2022. It will provide a boiler upgrade grant to help owners of domestic and small non-domestic properties in England or Wales with the upfront cost of installing low carbon heating systems, such as heat pumps. It will run from 2022 to 2025.

Benchmark

What is Benchmark?

Benchmark

Benchmark is a nationally recognised scheme that gives manufacturers and installers the responsibility for ensuring best practice for the installation, commissioning and servicing of domestic heating and hot water products, in accordance with the Building Regulations in England and Wales. 

Future of Home Heating

Are gas boilers going to be banned

Future of Home Heating

Gas boilers will not be banned from 2025. However, from 2025 new build properties could be required to have low carbon heating, such as a heat pump, 

What are heat pumps

Future of Home heating

What are heat pumps? We explain what an air source heat pump and a ground source heat pump is. 

How do air source heat pumps work

Future of Home heating

Living with an air source heat pump

Future of Home heating

Is a heat pump right for me? Can a heat pump provide hot water? How efficient is a heat pump? We answer your questions about living with an air source heat pump

Getting my home ready for an air source heat pump

Future of Home heating

We explain the energy saving work needed before you fit an air source heat pump, where in your home you can have it and who can install it

Grants for heat pumps

Future of Home heating

Check out if there are grants available in your area to help with the cost of installing air source heat pump

Why is the government banning natural gas

Future of Home Heating

In order for the UK to meet the government’s target of net zero emissions by 2050, the way we heat our homes will have to change.  The Government is planning to prevent the use of natural gas for heating new build homes in an effort to reduce carbon emissions.

What alternatives are there to gas boilers

Future of Home Heating

There are a number of alternative heating systems, both available now or currently in development. Electric boilers, heat pumps and heat networks are already

Are you developing a heat pump

Future of Home Heating

Our highly experienced team of experts is at the cutting edge of heat pump technology. Focused on quality, safety, and performance, we are helping to advance the use of heat pumps in residential and commercial buildings.

What is Net zero carbon

Future of Home Heating

Net zero carbon is when the amount of carbon dioxide we add to the atmosphere is the same or less than as the amount taken out of the atmosphere.  Achieving net

Can I still replace my old gas boiler

Future of Home Heating

Yes, you can replace your existing gas boiler and no, you don’t have to do this before 2025. There is talk that only gas boilers that are ‘hydrogen ready’, i.e., they can be adapted easily and quickly to work on a 100% hydrogen supply

Why are hydrogen boilers being developed

Future of Home Heating

Natural gas is a fossil fuel and is contributing to the climate change crisis. Manufacturers and government are working together to find solutions that reduce our dependence on fossil fuels and one of these is to repurpose the gas grid for transporting hydrogen

Boiler Upgrade Scheme

General Boiler info, Future of home heating, Energy Saving Tips

The government boiler upgrade scheme was launched in April 2022. It will provide a boiler upgrade grant to help owners of domestic and small non-domestic properties in England or Wales with the upfront cost of installing low carbon heating systems, such as heat pumps. It will run from 2022 to 2025.

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