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I urgently need to replace the prv on my baxi bahama 100 - ideally tonight. The question is do I need to fully drain the ch system? Or will I be o.k. if I let the pressure out of the system (not hard as it drops very quickly due to the leak prv) and switch off the water supply? the valve itself...

Hi, hoping someone here can help me with some advice? Recently moved to a house that was built in 1999, it has a baxi bahama 100 combi boiler. CH is working but I'm having trouble getting even heating throughout the house. I've noticed that the pressure gauge drops even though I'm regularly...