I was told that rattling pipes can be caused by sediment trapped in the water heater. Is this true? If not, what are the causes and is this a simple fix? Any advice is greatly appreciated.
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I never heard that sediment in water heater would cause pipes to rattle. I would think the pipes need to be strapped to supports more often. Also, water hammer can make pipes rattle. There are shock absorbers (air chambers) that can be put on to stop water hammer. You may want to post your question at Breaktime to get more answers.
Rattling pipes are caused by a plumber who never learned the correct way to install water pipes. Pipes that are loose and unsecured will jerk and move when the water is shut on and off. The jerking will bang against the wood framing and make the noise you hear.
Sand in the water heater might make bubbling noise only at the water heater. You will find whoever gave you the "stupid" answers is not a Journeyman plumber.
The simple fix is to lower the water pressure. The best fix is to find the loose pipe and clamp it down with something soft between the clamp, pipe and wood. In the attic or underfloor area, grabbing and shaking the pipe will duplicate and reveal the rattling noise you heard