Tankless Water Heater T And P Valve

To keep your heater from exploding.

Tankless water heater t and p valve. The t p relief valve short for temperature pressure relief valve is a critical safety device on your water heater. This is just a pressure relief valve i used with a 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. The takagi gas fired tankless water heater manual specifies a pressure relief valve on the hot water outlet.

If all goes well a tpr valve never gets used except during testing. In my application code requires a pressure relief but not a temperature relief t p. On the side or top of your water heater tank is a valve connected to a metal or plastic discharge tube pointing downward. You shouldn t need an expansion tank on a tankless water heater.

Here s an excerpt from that manual. So consult the manufacturer s installation manual. Gas fired tankless water heaters will usually require a pressure relief valve while electric on demand water heaters may not. This is one of those things that should never be needed unless something goes very very wrong with the tankless water heater.

I m betting the pressure is a little high and the act of water hammer is pushing the valve open a little. I d check the pressure on the house before you go to the extent of changing the t p valve. Tankless heaters are required to have a pressure relief valve.