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Plumbing in the Home/knocking coming from the water heater


I have a  3 year old water heater  that is knocking with  the hot  water  on in the  bathroom.. the hot water heater is right behind the  wall in the bath room  please help  ashley

Dear Ashley,

   Depending on the water quality near your home you are probably getting a buildup of sediment at the bottom of the water heater tank.  If the heater is electric then you can have buildup occurring on the heating elements as well.

   After just 3 years though, I wouldn't expect the problem to be too far advanced.  Try flushing and draining the tank.  You can find instructions for that either here from other questions or from many videos on youtube or other sites as well.

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Thomas Ambler


I am experienced at troubleshooting and solving all types of plumbing problems. Issues related to specific manufacturers fixtures and specifications though are beyond my field of expertise. I have dealt with problems in both rural and urban areas, and with water supply and drainage systems. Plumbing issues can be very obscure... such as odors, stains or occasional seepage. I have even had to chase rats from a customer's sewer line.


I have 25 years experience dealing with plumbing systems (which also includes hot water and steam heating systems). My main expertise is in diagnosing and solving problems. I have worked in construction and installation of new systems but do not regard myself as an expert in that area.

Asbury Park Press, Seattle Times, Denver Post.

I completed high school and one year of college. I served 4 years in the Marine Corps and have education in electronic and electrical troubleshooting and repair. I have attended classes on installing and repair of oil burners, and I have EPA universal certification for air conditioning and refrigeration. I am now enrolled as a full-time student at Everest college to re-train for a new career. Any donations of financial support would be greatly appreciated.

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All of Denny's Restaurants in NJ, Several Burger King stores, I have done work at two different homes for Bruce Springsteen. I have also worked for Jim Johnson (of J&J) and his family, Whitney Houston, Steve Forbes and many others.

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