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.

Tankless water heater t and p valve. This is one of those things that should never be needed unless something goes very very wrong with the tankless water heater. They are prone to failure particularly if there is any water condition hard water etc at all. I d check the pressure on the house before you go to the extent of changing the t p valve. 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.

So consult the manufacturer s installation manual. If all goes well a tpr valve never gets used except during testing. To keep your heater from exploding. You shouldn t need an expansion tank on a tankless water heater.

In my application code requires a pressure relief but not a temperature relief t p. Gas fired tankless water heaters will usually require a pressure relief valve while electric on demand water heaters may not. Here s an excerpt from that manual. The takagi gas fired tankless water heater manual specifies a pressure relief valve on the hot water outlet.

The valve is called a t p valve or tpr valve for temperature and pressure relief. On the side or top of your water heater tank is a valve connected to a metal or plastic discharge tube pointing downward. I m betting the pressure is a little high and the act of water hammer is pushing the valve open a little.