Tankless Water Heater T And P Valve

Here s an excerpt from that manual.

Tankless water heater t and p valve.

To keep your heater from exploding. This is just a pressure relief valve i used with a 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. Gas fired tankless water heaters will usually require a pressure relief valve while electric on demand water heaters may not.

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. Tankless heaters are required to have a pressure relief valve. So consult the manufacturer s installation manual.

I d check the pressure on the house before you go to the extent of changing the t p valve. They are prone to failure particularly if there is any water condition hard water etc at all. If all goes well a tpr valve never gets used except during testing. The t p relief valve short for temperature pressure relief valve is a critical safety device on your water heater.

The takagi gas fired tankless water heater manual specifies a pressure relief valve on the hot water outlet. On the side or top of your water heater tank is a valve connected to a metal or plastic discharge tube pointing downward. 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.