Take the tour ×  We had a new furnace installed about a month
ago. The heating in our house is hot water baseboards. Ever
since the new furnace was installed, when the heat comes on or
turns off, there is a loud bang in the pipes. It's not 100%
consistent, but it happens quite often.  We had the furnace
company come back to look at the problem. They said it was
likely water hammer because the new Honeywell valves flow twice
as much water as the valves that were on the previous furnace.
They only suggestions they had were adding padding around the
pipes where they leave the furnace room and closing the ball
valves on each zone a bit to limit the water flow. Neither
suggestion helped.  Would it make sense to try and fasten the
heating pipes coming out of the furnace to the walls in the
furnace room in an attempt to limit pipe movement and hopefully
reduce the sound? Does anyone have any other suggestions?  It
sounds way too loud to be air in the pipes and it didn't happen
with the old furnace, so something abou