Michael Grossi
Michael,Sometimes if you have very hot water (say off of a boiler system) your washers in the hot side of a faucet can start to vibrate and make a hammer noise.Im guessing its a single handle faucet. I would just replace the cartridge. This should fix your problem.If you do have very hot water you may want to lower the temp.Walter Kuntz http://www.testyourwater.com
