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Thanks for all the replies. @ boilerdoktor - I tested the internal expansion vessel using a tyre gauge, isn't the system pressure the bar gauge from 0 - 4 bar on the front of the unit? - When EV scraeder pressed only air comes out. After using the tyre pressure gauge on the EV the...

Using a tyre gauge. :?

Hello I have noticed water droplets from the pressure relief pipe recently which has also changed colour at the end ( blue ). I have kept an eye on the water pressure which on heating is always in the red / 3 bar. It then drops to 2 bar when water temp around 50 during the day / when no...