A heat trap with the piping should be installed if the hot water leaving the water heater travels upward and or horizontal.
Hot water heater check valve.
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A faulty check valve at the hot outlet could also reduce minimize or prevent adequate pressure and flow from reaching the hot faucets.
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.
What was just described is an installation where two check valves are necessary.
The valve should always be in good working order to ensure the water heater is safe in the event of extreme pressure buildup.
Water heater temperature and pressure relief valves or t p valves are a safety feature found on all tank water heaters.
1 some municipalities require a check valve to prevent the flow of water from the house back to main.
A standard water heater does not require a check valve.
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.
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This valve allows water or steam to escape from the water heater if the temperature or pressure gets.
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One on the cold water supply to the water heater before the connection of the recirculating piping and the other on the recirculating piping after the last connection of a hot water fixture.