The system normally sits at 1.5 to 2 bar happy as anything, I know the old prv was leaking (always dripping vent pipe). The new PRV does what it should and releases at 3 bar ( tested by using our wonderful 15bar water pressure!). Not sure (never caught the system shutting down) what pressure...
So all summer the boiler works a treat and then come winter the pressure relief valve relieves itself constantly. One valve replaced and pressure stays ok for 2 months until you guessed it pressure is zero and a puddle outside the house. Each time this happens (I assume there is a link) the...