knocking in pipes
#1
I have a gas hot water cast iron system,
when the heat goes on I hear a knocking
sound in the pipes for a min or two and
then it stops. The knocking only happens
on startup. Thanks for you help.
when the heat goes on I hear a knocking
sound in the pipes for a min or two and
then it stops. The knocking only happens
on startup. Thanks for you help.