Fix it before it blows out a solder joint, or damages a fixture.
Does it hammer just when you turn the water on or off, or does it hammer all of the time that the water is running?
It could be caused by a partially closed valve, or a loose faucet washer that flutters when the water flows past it. I have also found pieces of solder shaped like coins that were trapped at ells in the line. They flutter like crazy; it sounds like the whole house is going to come apart.
It could be caused by an area of low pressure at a place where two different sized pipes connect.
It could be that you need to put some air into your water storage tank, or that you have a bad bladder in the water storage tank.
If your plumber is good (and sometimes lucky) he will isolate the problem quickly. If he is not, he may be scratching his head for a while with this one. Sometimes it's easier to fix than to find.
The other guys will be along with some input too, so check back.
I do have a degree in hydrodynamics which is the study of fluids as they pass by structures. I also have a degree in fluid dynamics which is the study of fluids within structures. The latter is the relevant part.
Both relate to sympathatic (harmonic) fatigue of materials. Vibration will cause usually ductile materials, such as copper, to change into a crystaline structure. Crystaline structures are more prone to breakage, think diamonds or carbides. Glass is a fluid.
I have city water. I believe it is heated by a coil I do not have a hotwater tank. Not sure about a pressure reduction valve. I am a web designer so all this is greek to me. Basically, what you guys are telling me is to call a plumber.
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