boiler expansion tank

  1. S

    New Expansion tank on hot water boiler - but still getting water overflow

    I've recently installed a new expansion tank on my hot water boiler. The tank is not full of water and releases air when i press the schrader valve. However, the bucket below my TP relief valve continues to fill with water...I need to empty it once a week or I get a wet basement floor. I have...
  2. Audra Caler

    What is the purpose of this second expansion tank on our boiler?

    Hi all, We just bought a house with a Weil Mclain WTGO-3 115k BTU Output Gold Oil Boiler w/ Tankless Heater and baseboard heating and have been struggling to understand why the system has two expansion tanks. The smaller expansion tank adjacent to the boiler is a Therm-X-Trol ST-5 (2 gallon)...
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