Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

Cavitation noise

Chuck_36Chuck_36 Member Posts: 42
Last season my heating system was noisy at the boiler; until the sysem had been cycling almost all night, when it would stop. I have been advised it was cavitation. Last season I installed a Grundfos 15-100 in place of a 15-58, thinking that more "punch" at a low flow would improve the heat at the farthest radiators. That worked as best as I can tell. But now the noise. The boiler is a Burnham 204, with a boiler by-pass, circulator pulling away on the supply side. By pass is fully open and the return flow ball valve is half closed. The provides good boiler operating temperature which is something I have wanted. Piping is 1 1/4" CI at the boiler. All large Cast iron feeds and radiators. Your thoughts and suggestions to eliminate the noise are welcome.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!