expansion tank

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    Weil-Mclain Boiler Mystery Leaking

    I have a Weil Mclain WGO-5 boiler. ITT Bell Gossett HFT-60 diaphragm expansion tank next to the boiler. When the boiler is off the pressure gauge says 3 PSI and temperature around 167 degrees. During a long burn the pressure rises to 25-28psi and the temperature hits 175 area. No water leaks...
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