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This most commonly occurs because the temperature on the hot water heater is set too high. Another thing that can lead to excess water pressure is if the exterior water supply to a house comes in at too high a pressure. A defective temperature pressure relief valve can also lead to an excess buildup of pressure in a hot water heater.What makes a water heater build up pressure?
As the temperature increases, the maximum working pressure for which the water heater was designed (150 PSI) can be exceeded. Pressure build-up caused by temperature increase in a closed system is very rapid - the burner operating for only a few minutes to raise the temperature 16°F.How high the max pressure of water heater can be?
The pressure the system is designed to operate at is usually 12- to 25-psi for a two-story house, and 18- to 25-psi for a three-story house. The operating high temperature should not be over 200 F., but 180 F. is the normal maximum design temperature.Is a tank-style water heater always under pressure?
If you have an electric tank-style water heater, the hot water that comes out of it should be under the same pressure as the cold water that enters it. If the cold water in the shower has enough pressure, but the hot water doesn't, check your plumbing pipes -- particularly if you live in an old house.