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I've just recently replaced a Tower 2 port zone valve with a Honeywell V4043H1056 22mm as the Tower had been leaking and was passing a fair amount of heated water.
System boiler, two heating zones and one DHW zone valve.
Is it normal for them to pass a little under pressure? All seems okay when removed and blowing through them as a test. Even the replacement valve appears to pass a bit and I do not think it is heat transfer or reverse flow.
System boiler, two heating zones and one DHW zone valve.
Is it normal for them to pass a little under pressure? All seems okay when removed and blowing through them as a test. Even the replacement valve appears to pass a bit and I do not think it is heat transfer or reverse flow.