2. How to reset pressure on my Heat Interface Unit

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

The Baxi AquaHeat HIUs have an analogue pressure gauge visible on the front of the unit, the optimum system pressure is highlighted with a green triangle on the gauge. If the system pressure has dropped below the optimum amount, the pressure can be topped up using the Baxi EasyFill (where the Baxi first fix rail has been installed). 


The EasyFill can be located on the top of the unit. The below video shows the top-up procedure for one of our Baxi gas boilers with which we utilise the same filling lever.

Related FAQs

Heat Interface Unit (HIU) efficiency 

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..

Read more

Heat Interface Unit (HIU) pros and cons

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

Read more

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

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

Read more

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

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.

Read more

What support is available in the design of my system?

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

Read more
Show more