Quote:
Originally Posted by mtdjed
I have a gas hot water heater and I recently was in the garage when the water heater started up. I hear several low clunking noises as it first starts and then the noise stops as the heater goes through its heating process.
Water heats well, no leaks, expansion tank seems to be functioning. I have talked to others who have noticed similar startup noises.
Wondering if someone else has experienced the condition and knows the cause? Defective sacrificial anode comes to mind.
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Good suggestions, but you could try & drains about 5 gals. out of it to see if you have sediment on the bottom of the tank. Doesn't hurt to try.