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  1. H

    Prob Cavitation not Air in System

    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...
  2. H

    Air in system

    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...
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