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Posted by jh on January 13, 2010 at 17:34:44:
In Reply to: Water coming out of pressure relief valve posted by tom K on January 11, 2010 at 18:10:27:
check the press. on your expansion tank. if you look closely, very likely it has been stamped on tank. if diafragm in tank has been compromised, the water when heated has no place to go therefore making your safety relief valve discharge to compensate for the "swell"