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Hi Franc0Nelis
It’s been a couple of months since your post about loosing water / pressure via the PRV

Did you find out what caused the problem?
Would be great to know as a reference for the...

It’s one of those “it depends” situations.
Please see link below.

However, even if an owner did decide it was prudent to call in a gas engineer to for example start by first checking / pumping up...

Doesn’t present as an Intergas specific problem — most likely a general boiler issue.

First thing I’d check is how much the system pressure rises when all the radiators are fully hot.
Difficult...

I believe the purpose of the Intergas boiler’s RF unit is to enable the direct connection of Honeywell stand alone thermostats.

The boiler’s Opentherm connection is hardwired via a two conductor...

During heating season there is often a slug of hot water in the heat exchanger DHW waterway due to there being a combined CH and DHW heat exchanger design on Intergas boilers.

In summer months the...

Intergas Xtreme 30. Works 100%

Even better. I believe it’s the flow temperature.
This can be adjusted on the Intergas X series boilers. I think the lowest temperature default is 30 C.