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Though the usage varies, there is a general rule of thumb you can use for getting the right size cylinder for your home, usually between 45-60 litres of water per occupant. A two-bedroom home (2–3 occupants) typically requires a cylinder that holds between 120 and 180 litres and three-bedroom homes (3–4 occupants) typically need a cylinder that holds between 180 and 240 litres.

According to the UK government’s Simple Energy Advice website, installing an ASHP in a typical four-bedroom detached house could improve the property’s EPC rating from a D to a B, potentially saving homeowners up to £1,300 per year on their energy bills.

When talking about the size of an air source heat pump, we’re actually referring to the power output, measured in kilowatts (kW) rather than its physical size. The output your heat pump will need to deliver depends on unique aspects of your home, such as:

• The size and layout of your property
• Occupancy and average heating usage
• How old your property is
• Quality of insulation
• Type of windows
• Your desired indoor temperature 

These, naturally, will be different for everyone, so be sure that you assess all of these carefully with your installer.

Typically, your boiler should be set to at least 65 degrees Celsius to prevent bacteria growing in the water and maintaining comfort.

The short answer is yes. Find out how an hot water cylinder work with an immersion heater works; and how to maintain the system...

Air source heat pump tends to cost around £14,000. But, homeowners in England & Wales can get a discount of up to £7,500 off an ASHP installation. More...

Grants such as the Boiler Upgrade Scheme are available to help eligible households with the cost of having an air source pump installed at the property.