Hot Water Boiler Expansion Tanks – HVAC Hydronics

Hot Water Boiler Expansion Tanks –┬áThere are two types of expansion tanks used on hot water boiler systems. The steel expansion tank and the bladder type expansion tank. These expansion tanks are used to provide a cushion for the expansion of water when it is heated. Without this cushion of air, the pressure in the boiler system would exceed the setting on the pressure relief valve. This will cause the pressure relief valve to open and discharge water to relieve the pressure. (more…)

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