Tankless Water Heater T And P Valve

On the side or top of your water heater tank is a valve connected to a metal or plastic discharge tube pointing downward.

Tankless water heater t and p valve.

The takagi gas fired tankless water heater manual specifies a pressure relief valve on the hot water outlet. Gas fired tankless water heaters will usually require a pressure relief valve while electric on demand water heaters may not. The t p relief valve short for temperature pressure relief valve is a critical safety device on your water heater. To keep your heater from exploding.

This is just a pressure relief valve i used with a tankless water heater. This valve may sit quietly unnoticed on your water heater but it has a very important purpose. You shouldn t need an expansion tank on a tankless water heater. The valve is called a t p valve or tpr valve for temperature and pressure relief.

I m betting the pressure is a little high and the act of water hammer is pushing the valve open a little. Tankless heaters are required to have a pressure relief valve. So consult the manufacturer s installation manual. In my application code requires a pressure relief but not a temperature relief t p.

If all goes well a tpr valve never gets used except during testing. This is one of those things that should never be needed unless something goes very very wrong with the tankless water heater. My personal opinion of tankless heaters is that they are way too expensive to install and maintain never mind that few plumbers know how to service them.