Re: "Air in line" when hot water heater is on.
Posted by jimbo on April 07, 2004 at 22:21:27:
In response to Re: "Air in line" when hot water heater is on.
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: I can definitely relate to one point you make here--about the the typical house has become a closed system due to the changes in the mains you mention. Out here ( So. Calif.) the codes do not require an expansion tank; but in the last several years I have noticed it is very common for pressure buildup to become a problem when a new water heater is installed. My theory is that it was a problem with the old heater, but the T/P valve was frozen shut with mineral deposits, so the problem was not noticed. I now always recommend an expansion tank be installed.


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