lately my gas water heater makes loud knocking noise when you cut water on in the house for a couple of seconds. it is not leaking or anything else it is a couple years old whats up .thanks andy :)
Sounds like loose water pipe(s)
Sharp Advice
01-12-05, 03:25 AM
Hello: Andy
Tank needs flushing to remove internal rust. The noise is called percolating. Follow the instructions below and read the sticky note pertaining to water heaters in this forum topic.
PERCOLATING - Noises or Noisey Tanks:
Water heaters that make noises or sounds like they are percolating is caused by excessive sediment deposits on the bottom of the tank. The noise is commonly referred to as "percolating."
Which means the heat transfer to the water must pass through a layer of sediment, which causes the water to actually boil close to the bottom of the tank.
Thus the boiling is the method and means used to pass the heat through the sediment to heat the water inside the tank. This also causes a very high concentration of heat at the base of the tank.
To help resolve the problem, tank flushing is required. See the posted topic at the topic of the forums list of questions. Read the tank flushing instructions and flush the tank.
Tank flushing usually but not always resolves the problem. Tanks that have not been flushed yearly may have an excessive amount of sediment which has already baked onto the bottom of the tank.
Older tanks also acquire this problem despite frequent flushing and tanks used in high sediment water supplies. If flushing does not resolve the problem, tank replacement is the only solution.
WATER HEATER DRAINING AND FLUSHING INFO:
http://forum.doityourself.com/showthread.php?t=159797
Since the question pertains to water heaters and there is a water heater topic in the plumbing forum group of topics, I moved your question into this topic. Gas appliances only pertains to kitchen appliances. The professional plumbers may have additional info and or advice to offer you. Check back on your question several more times.
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