Tankless Water Heater Pressure Relief Valve Requirements

Many regions require the t p valve to lead outside for added safety and some may even require two valves for redundancy.

Tankless water heater pressure relief valve requirements.

Discharge through an air gap located in the same room as the water heater. What are the code requirements for the discharge piping from a temperature pressure relief tpr valve at a water heater. 504 6 requirements for water heater tpr valve discharge piping. Always refer to the manufacturer s instructions before installing the valve.

Installing a pressure relief valve prv before your tankless water heater is not only required in some regions depending on where you live but is also a very important safety feature. The valve s sole purpose is to keep the pressure and temperature inside of a tank below certain levels. Tagaki and others i e. But if one does it s a big deal.

T p valve the temperature and pressure relief valve is an important safety device which goes off when your tank exceeds 210 degrees fahrenheit or 150 psi. Storage water heaters operating above atmospheric pressure shall be provided with an approved self closing levered pressure relief valve and temperature relief valve or combination thereof. The relief valve shall conform to ansi z21 22. The tankless water heater should have been installed only by a qualified tagaki approved installer so it should be proper.

When replacing a pressure release valve unplug. The discharge piping serving a pressure relief valve temperature relief valve or combination thereof shall. The relief valve shall not be used as a means of controlling thermal expansion. Not be directly connected to the drainage system.

Always be sure that your tankless water heater is able to relieve both the water temperature and pressure at a given point in order to avoid damage and possible injury. Tankless water heater pressure temperature relief valve safety requirements. Tankless water heater flush kit 3 4 lead free isolation service valves 3 4 inch temperature pressure relief valve for hot water heaters single handle full port ips isolator brass nsf 61 4 4 out of 5 stars 8 52 34 52 34 1 09 oz. Tankless water heaters and pressure release valves vary by manufacturer.

Pressure only valves such as cash acme fwl 2 zurn p3000br or watts 174a would be required. This valve should be connected to a tube that discharges no more than six inches above floor level so hot water won t scald anyone nearby. The temperature pressure relief valve lets water escape if the temperature or pressure is too high. By most standards the benchmarks are 150 psig and 210 f respectively.

Bosch noritz etc require a pressure only relief valve on the hot water output.