gas water heater

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  #1  
Old 04-21-00, 02:51 PM
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my hot water heater is making a knocking sound when it is heating up, any ideas?
 
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  #2  
Old 04-21-00, 05:05 PM
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it sounds like thermal expansion, but you didn't give us much background to go on. Such as:
1)Did this just start?
2) is the heater new?
3) do you have a backflow preventer on your water line?
4) ect ect ect.
install a 2.5 gal. thermal expansion tank on the incoming cold water line befoe it goes into the water heater.
 
  #3  
Old 04-21-00, 10:18 PM
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SOUNDS LIKE A FAIRLY OLD HEATER THAT HAS AN ACCUMULATION OF SEDIMENT IN THE BOTTOM CREATING THE RUMBLING ??
 
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