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.

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What outputs are the Baxi AquaHeat range available in?

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

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

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.

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What approvals and certification does the Baxi AquaHeat range hold?

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

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What is VWART?

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

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

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

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