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Old 01-25-2016, 06:41 PM   #3
5/0
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Join Date: Jul 2004
Location: Mansfield,MA.
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Your forced hot water loop is basically a close system you will have an auto feed that's located on the cold water feed at the boiler.this will keep the pressure range from 12-15 psi.

The noise you are hearing is the expansion of the pipes when they are heating up and rubbing on the wood or the hangers.

Water hammer is usually on the cold water line public water pressure will normally range from 55-90 psi anything higher you'll need a pressure reducing valve that would get installed just after the water meter.
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