Boilers need an expansion tank that allows the water to expand as the heating system functions. Thus, the relief valve is working alright, and you must address the pressure spike in the boiler system.Ī common reason for this pressure spike is a failing expansion tank. Suppose your boiler blows the relief valve when the pressure gauge reads 30 psi (~2.07 bar) or greater. Hence, the relief valve is faulty, and you should replace it. A relief valve should not blow at this pressure, but it can fail due to wear, sediment buildup, corrosion, or damage. The pressure inside a standard residential boiler system can reach ~25 psi (1.72 bar) when you call for heat. However, the relief valve can blow despite the pressure gauge reading below 30 psi (~2.07 bar). If it seems to be working properly, you can investigate the other probable causes in this guide. Thus, you should check the temperature and pressure gauge for your boiler to confirm if the relief valve is doing its job correctly. So, this temperature and pressure relief valve should blow or allow water to leak through its outlet when the closed-loop boiler system exceeds 30 psi (~2.07 bar). Most residential boilers use a relief valve rated for 30 psi (~2.07 bar). Why Your Boiler Is Blowing Its Relief Valve
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