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Thanks for all that helped in my last thread, but I think now my prob is cavitation. Being a fully pumped open vent sys with 2 zone valves . The distance from the boiler to the pump is approx 30ft horizontally piped in 22mm. The noise in the pump happens intermittently and just sounds like a...

Hi All, first post I got an open vented system i've recently changed from gravity to fully pumped. I seem to be sucking air into the system. I teed off the vent pipe to the pump to feed 2 zone valves. I teed in the cold water feed into the vent pipe about 4ft further up. Should I have teed cw...