Tankless Water Heater T And P Valve

Here s an excerpt from that manual.

Tankless water heater t and p valve. They are prone to failure particularly if there is any water condition hard water etc at all. In my application code requires a pressure relief but not a temperature relief t p. I d check the pressure on the house before you go to the extent of changing the t p valve. So consult the manufacturer s installation manual.

This is just a pressure relief valve i used with a tankless water heater. 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. 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.

I m betting the pressure is a little high and the act of water hammer is pushing the valve open a little. On the side or top of your water heater tank is a valve connected to a metal or plastic discharge tube pointing downward. The valve is called a t p valve or tpr valve for temperature and pressure relief. This valve may sit quietly unnoticed on your water heater but it has a very important purpose.

The takagi gas fired tankless water heater manual specifies a pressure relief valve on the hot water outlet. You shouldn t need an expansion tank on a tankless water heater. If all goes well a tpr valve never gets used except during testing.