Pressure-relief valves are a vital component of tankless water heaters. The valves permit you to manually release air in the heat chamber when filling the chamber with water for the first time, or during routine maintenance. Whether you’re installing a new indoor or outdoor tankless water heater, or replacing a pressure-release valve, include a length of PVC pipe as a discharge line. Pressure-release valves have been installed following the heater is mounted in place along with the water lines have been linked.
Wrap 2 layers of vinyl contractor’s tape around the threads on the pressure-release valve. Wrap the tape at the direction the threads screw into the port on the water heater to get the best outcomes.
Screw the valve to the vent on the lower border of the tankless heater by hand. Fit a flexible wrench onto the flat portion of the valve and continue to tighten the valve clockwise. Discontinue when the valve is pretty tight and the pressure-release rib is facing toward the outer border of the tank.
Wrap plumber’s tape around the threads of a 3/4-inch thread-to-slip PVC connector. Screw the threaded end clockwise into the open port at the lower portion of this pressure-release valve. Tighten the adapter snugly with adjustable pliers.
Gauge the distance from the lower end of this connector to the ground or ground and bend 4 inches to permit clearance to get an overflow pan at the lower end of the discharge line.
Cut a piece of 3/4-inch PVC pipe to length with PVC cutters or a hacksaw. Remove burrs in the cut end with a file.
Hold the pressure-release valve with one hand and then insert one end of the discharge line to the opening at the slip, or unthreaded end of this connector. Slide the pipe as you thrust it in the connector and then stop if the pipe is tightly fitted to place.