- Joined
- 8 Oct 2008
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What non return valve did they install, is it the sprung loaded or clacker type.
The later usually is more a metal to metal tinkle/rattle.
Don't know. The system (pipes and boiler) si old. There is a rattle if the CH circulator is on the lowest speed.
MickyG - If I could live with the noise I wouldn't be asking for advice.