Hot Water Heater Check Valve

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Hot water heater check valve.

There are at least 2 possible reasons for a check valve on the inlet of a hot water heater. Water heaters come equipped with a temperature and pressure relief valve also known as a tprv. Once a check valve is installed the hot water system becomes a closed system causing thermal expansion. Now a expansion tank is required.

This valve allows water or steam to escape from the water heater if the temperature or pressure gets. Without two check valves the system will not work properly. A heat trap with the piping should be installed if the hot water leaving the water heater travels upward and or horizontal. The valve should always be in good working order to ensure the water heater is safe in the event of extreme pressure buildup.

2 a check valve is used when a recurculating system is used to prevent long waits for hot water at fixtures far from the heater. What was just described is an installation where two check valves are necessary. 1 some municipalities require a check valve to prevent the flow of water from the house back to main. A faulty check valve at the hot outlet could also reduce minimize or prevent adequate pressure and flow from reaching the hot faucets.

A standard water heater does not require a check valve. 3 4 in lead free tankless water heater valve set female pipe thread hot and cold valve set no spring check 150 psi relief valve 44 95 44. Some water heaters have a check valve located at the cold water inlet to the heater but since you re able to fill the heater and see it draining a check valve at this location is probably still viable.