Related FAQs

Question 1

Heat Interface Unit (HIU) efficiency

Accepted Answer

Using a twin plate HIU (indirect Heating & Domestic Hot Water) as an example, there are a few ways in which product efficiency can be measured. Read more..

Question 2

Heat Interface Unit (HIU) pros and cons

Accepted Answer

Find out the pros and cons of Heat Interface Units (HIUs) here at Baxi FAQs...

Question 3

How to reset pressure on my Heat Interface Unit (HIU)?

Accepted Answer

Watch this video to find out how  to reset pressure on my Heat Interface Unit (HIU)...

Question 4

What is the price of a HIU (Heat Interface Unit)?

Accepted Answer

Average cost for a Heat Interface Unit (HIU) can be from around £800 to £1500, depending on the HIU type, performance of the unit and equipment provided.

Question 5

What support is available in the design of my system?

Accepted Answer

Our Application Engineers can assist in advising clearances, dimensions, and possible locations for consideration. Find out more...

Question 6

What support is available for installation / set up of the Heat Interface Unit (HIU)?

Accepted Answer

Baxi’s technical helpline supports you at every step of your installation & commissioning process. Find out more about training & enhanced warranty here.

Question 7

How often does a Heat Interface Unit (HIU) need servicing?

Accepted Answer

Heat Interface Units (HIUs) have an annual maintenance requirement to ensure safe working and optimum performance. Find out more...

Question 8

Are the Baxi AquaHeat HIUs compatible with our range of boilers, water heaters and cylinders?

Accepted Answer

At Baxi we have a broad range of products to help meet our customers needs. Find out if HIUs are compatible with Boilers, water Heaters, & Cylinders here.

Question 9

Does the Baxi AquaHeat range come with any remote monitoring or control capabilities?

Accepted Answer

Yes, all Baxi AquaHeat models are compatible with our Baxi Data Management, Mercurius platform. Find out more about all the functionality it has to offer.

Question 10

What type of control system is used on the Baxi AquaHeat range?

Accepted Answer

Baxi AquaHeat HIUs contain a full electronic control system, using our in-house designed TR-04 controller. Some Key Functions can be found here...

Question 11

In what lead time are the Baxi AquaHeat range products available?

Accepted Answer

Baxi AquaHeat range & associated accessories & controls are available on an 8-week lead time. Baxi can also manage a phased delivery depending on project.

Question 12

What accessories do I need for my Heat Interface system?

Accepted Answer

The full list of compatible accessories required for your Heat Interface system can be found here...

Question 13

What is VWART?

Accepted Answer

VWART stands for Volume Weighted Average Return Temperature. Read more about it in our Baxi FAQ section...

Question 14

What approvals and certification does the Baxi AquaHeat range hold?

Accepted Answer

Baxi AquaHeat range of Heat Interface Units (HIUs) are all compliant with UK Water Regulations & Bylaws, with the certification carried out by NSF. Read more

Question 15

What primary (Heat Network) conditions are the AquaHeat HIUs suitable for operating at?

Accepted Answer

The AquaHeat range of HIUs can operate with primary temperatures from the Heat Network up to 90°C and maximum primary operating pressures of 16 bar.

Question 16

What temperatures can the Baxi AquaHeat Heat Interface Units (HIUs) operate at?

Accepted Answer

The Baxi AquaHeat Heat Interface Unit (HIU) range can provide space heating from 15 to 85°C. The AquaHeat HI / HWI models can provide DHW from 40 to 65°C.

Question 17

What outputs are the Baxi AquaHeat range available in?

Accepted Answer

Baxi AquaHeat HI/HWI is available in two different outputs, available with or without a Heat Meter and the Mercurius connected module factory fit. Read more

Question 18

What types of HIU are available as part of the Baxi AquaHeat range?

Accepted Answer

With two models, the Baxi AquaHeat Heat Interface Unit (HIU) range can meet the needs of most apartment building developments. Find out more...

Question 19

What applications are Heat Interface Units (HIUs) suited for?

Accepted Answer

Through these various product types, HIUs are suitable for residential and commercial applications as well as providing heat for communal spaces. Read more

Question 20

Does a Heat Interface Unit (HIU) use gas or electricity?

Accepted Answer

There is no gas connection required with an Heat Interface Unit. Energy required for heating and hot water is taken from the heat network. Find out more...

Question 21

How does a Heat Interface Unit (HIU) work?

Accepted Answer

FAQ Description/Answer Here

Question 22

What is a Hydraulic Interface Unit (HIU)?

Accepted Answer

Find out what an Hydraulic Interface Unit or HIU is at our Baxi FAQ's section...

Question 23

What is a Heat Network?

Accepted Answer

Find out what heat networks are and different types of heat networks at our Baxi FAQ's section...

Product Code	Description	7867470 – Aquaheat HI/HWI 4/50 w/ Heat Meter & Mercurius	7867472 – Aquaheat HI/HWI 4/50	7867476 – Aquaheat HI/HWI 14/50 w/ Heat Meter & Mercurius	7867477 – Aquaheat HI/HWI 14/50
7867481	Mercurius	O	P	O	P
7867480	First Fix Rail inc. flushing bypass & filling loop	P	P	P	P
7867485	First Fix Rail inc. flushing bypass & filling loop for use with stand-off bracket	P	P	P	P
7867482	Stand-off frame	P	P	P	P
7867483	Secondary L-pipes for use with stand-off frame	P	P	P	P
7867484	Primary L-pipes for use with stand-off frame	P	P	P	P

What accessories do I need for my Heat Interface system?

Take a look at Baxi's AquaHeat HIU

Related FAQs

Heat Interface Unit (HIU) efficiency

Heat Interface Unit (HIU) pros and cons

How to reset pressure on my Heat Interface Unit (HIU)?

What is the price of a HIU (Heat Interface Unit)?

What support is available in the design of my system?

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