Water Heater Thermal Expansion Tank Sizing

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Water heater thermal expansion tank sizing.

Sizing expansion tanks for water heaters can be a complex engineering challenge but residential expansion tank sizing has been simplified through the use of calculators. Our sizing guide for potable water expansion tanks helps you find the right watts regulator or data potable tank. Thermal expansion tank sizing residential commercial. Pmc sizing chart for residential water heaters water heater capacity in gallons inletwater pressure 30 40 50 66 82 100.

Determining incoming or supply water pressure. Expansion tanks are pre charged with a 38 psi air charge. There are two important considerations to make when sizing an expansion tank. The incoming or supply water pressure and the volume of the storage tank.

Hot water heater expansion tanks are small but there available in several sizes. If the inlet water pressure is higher than 38 psi the expansion tank s air pressure must be adjusted to match that pressure but must not be higher than 80 psi. New or larger expansion tanks may be needed due to pressure reducing valves check valves and backflow preventers added to the community s water system.