Please see link below.
Symptoms of water heater pressure relief valve failure include leaking water from the valve, excessive pressure in the water heater, and hot water not being delivered at the right temperature.
Your water heater relief valve may be dripping because there is too much pressure or temperature in the tank, which causes the valve to release excess water to prevent an explosion.
To determine if your water heater is leaking from the relief valve, check for water around the valve or any signs of dripping. If you notice water, it may indicate a leak and you should have it inspected by a professional plumber.
It is necessary to perform a hot water heater relief valve replacement when the valve is leaking, not functioning properly, or if it is more than five years old to ensure the safety and efficiency of the water heater.
To determine if your hot water heater is leaking from the relief valve, check for water pooling around the valve or dripping from it. If you notice any signs of leakage, it may indicate a problem with the valve or the pressure in the tank.
The purpose of the relief valve in a tankless water heater is to release excess pressure and prevent the tank from exploding due to a build-up of pressure.
To replace a hot water heater pressure relief valve, first, turn off the power and water supply to the heater. Drain some water from the tank to relieve pressure. Use a wrench to unscrew the old relief valve and remove it. Wrap the threads of the new relief valve with plumber's tape and screw it into place. Reconnect the water supply and power, then test the new valve for proper function.
150 psi
To determine if your hot water heater pressure relief valve is leaking, check for any water dripping or pooling around the valve. If you notice water, it may indicate a leak and you should have it inspected by a professional.
If water is coming out of the top of the water heater, it may be due to a leak in the pressure relief valve or a faulty temperature and pressure relief valve. To fix this issue, you can try replacing the pressure relief valve or adjusting the temperature settings on the water heater. If the problem persists, it is recommended to contact a professional plumber for further assistance.
Ask the manufacturer for the safest way to do install it
To replace the pressure relief valve on a water heater, first, turn off the power and water supply to the heater. Allow the water to cool down. Next, locate the valve on the top or side of the heater and unscrew it using a wrench. Replace it with a new valve of the same size and pressure rating. Finally, turn the water and power back on and check for leaks.