View Single Post
Old 10-20-2022, 08:57 PM   #7
John Mercier
Senior Member
 
Join Date: Jun 2021
Posts: 2,904
Thanks: 2
Thanked 523 Times in 431 Posts
Default

That might be due to a circulator...

The system should be charged with no air in it, but when the circulator comes on and the zone valve is open... it can shake the pipes in some case.
The heated water also conducts heat to the piping and causes it to expand.
John Mercier is offline   Reply With Quote