By code you have to run the same size as the opening which means the pipe needs to be 3 4 in diameter.
Water heater relief valve pipe.
How doers get more done.
The pipe itself needs to be either copper cpvc or galvanized water piping.
Place a bucket under the discharge pipe connected to the valve to collect any water and open the t p valve.
Water heaters come equipped with a temperature and pressure relief valve also known as a tprv.
This valve allows water or steam to escape from the water heater if the temperature or pressure gets.
Open the drain valve on the water heater then open the hot water tap at a nearby sink to release the vacuum on the tank.
The relief valve on your water heater has a pipe attached.
When no water exits the discharge pipe from the t p valve close the drain valve and remove the garden hose.
Most residential water heaters have a 3 4 threaded opening for the discharge pipe.
But if the termination of the piping is not readily visible such as if it is located under the house the water will continue to drain until the homeowner gets an amazing electric or gas bill and goes searching for the reason.
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The temperature pressure relief valve or tpr valve on any heated appliance that contains water such as a heating boiler hot water tank water heater water cylinder must have a drain line or discharge tube properly installed routed and made of proper materials.
If the pressure in the tank exceeds 150 psi or the temperature exceeds 210 degrees fahrenheit the tpr valve opens to release the pressure.