Re: thermal expansion pressure
Posted by JEFF on August 31, 1999 at 18:00:50:
In response to Re: thermal expansion pressure
: It depends on the amount of water, the temperature before heating began, any possible pressure reducing backflow, and the amount of air in the system (if any). Answer, impossible to tell you.

: : How much of a pressure increase should occur when the water heater is on and heating or just after it shuts off?

OK, lets try this, is 120psi after water heater shutoffs too much for household pressure? Pressure stays at 120 psi for about 10 minutes or until a fuacet is turned on.

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