i didn't turn up the pressure, i have 2 zone (basement and upper floor)
and the basement hot water is using a pump to cycle the water i bleive
( which i have see a device near the boiler look like pump)
the pipe around the boiler has change , and also partial of the return
pipe too. there was a leak on pipe before, which has been fix.
If it is pipe hanger, how come the loudest noise is from near boiler?
i do call people to check, which the boiler didn't show some "respect".
When they come and check, the boiler keep quite and system just look
fine as new. Just can't keep paying for visite for nothing.
now i belive it is more like you guys say water hammer, because it is
only ON when the heat is coming.
BTW: i say turn higher temp. on basement which i want to cycle the
water that is in the pipe. Because the basement most time heat is not
on, which pump will not cycleing the water.
So far so good, as today the hammer "music" is not coming every night.
If it do come, it go away faster than before. I will do more cycling
the water to clean up the pipe.
Thanks for all your people helping me, hope this info will be helping
other water hammer victims too.