T P Valve Tankless Water Heater

Changed out t p valve twice then resorted to changing entire water heater.

T p valve tankless water heater.

40 gallon water heater keeps leaking from t p valve after using water in house. Every water heater whether gas or electric needs a temperature and pressure relief valve because without one it could begin to leak or even explode. The ap12993c is the equivalent version with the watts 3 4 inch pressure relief valve model 3l 150. I have a tankless heater ever since i bought the house 1 5 years ago the t p valve has been discharging slightly when you turn off a hot water tap.

We are here to tell you that it is okay for some water heaters to be without temperature pressure relief valves. The valve is called a t p valve or tpr valve for temperature and pressure relief. So consult the manufacturer s installation manual. Screw the valve into the port on the lower edge of the tankless heater by hand.

Here s an excerpt from that manual. They wonder if the missing valve makes the tankless water heaters less efficient or prone to break downs. Gas fired tankless water heaters will usually require a pressure relief valve while electric on demand water heaters may not. Pressure only valves such as cash acme fwl 2 zurn p3000br or watts 174a would be required.

Fit an adjustable wrench onto the flat portion of the valve and continue to tighten the valve clockwise. The takagi gas fired tankless water heater manual specifies a pressure relief valve on the hot water outlet. The valve s sole purpose is to keep the pressure and temperature inside of a tank below certain levels. Now the t p valve is leaking constant when you use hot water.

Also known as the temperature and pressure valve this device automatically releases excess pressure in your water heater system. The tankless water heater should have been installed only by a qualified tagaki approved installer so it should be proper. This valve can be used with all rheem tankless water heater models. Bosch noritz etc require a pressure only relief valve on the hot water output.

Tagaki and others i e. If all goes well a tpr valve never gets used except during testing. I was told this is normal.