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Have a 30 yr old hw boiler, old pressure temp gauge and blow off valve just replaced, now pressure is at near zero cold, by the time it gets to 170 it's at 30lb and blows the 30lb relief valve, expansion tank valve is open, is something wrong with expansion tank? Is a 30lb safey relief valve to high a rating on a 30 yr old boiler, it's a small 2 story with boiler in basement, boiler has circulator pump