I've pressurised until the low pressure light goes off (gauge is reading just under 1bar) and then run the heating and watched as the pressure gauge goes to 3bar+. At this point, excess water is send through the PRV and I can see it dripping from the overflow. Then when the system cools, the...
What was the outcome on this one as I think that I'm in a very similar position. We've just bought a house and the pressure drops every day and the system has to be refilled.