Tankless Water Heater T And P Valve

To keep your heater from exploding.

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. The takagi gas fired tankless water heater manual specifies a pressure relief valve on the hot water outlet. Tankless heaters are required to have a pressure relief valve. This valve may sit quietly unnoticed on your water heater but it has a very important purpose.

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. The valve is called a t p valve or tpr valve for temperature and pressure relief. This is just a pressure relief valve i used with a tankless water heater.

The t p relief valve short for temperature pressure relief valve is a critical safety device on your water heater. In my application code requires a pressure relief but not a temperature relief t p. Here s an excerpt from that manual. They are prone to failure particularly if there is any water condition hard water etc at all.

So consult the manufacturer s installation manual. You shouldn t need an expansion tank on a tankless water heater. Gas fired tankless water heaters will usually require a pressure relief valve while electric on demand water heaters may not.