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How to Replace Water Heater Gas Control Valve

September 18 / 2021

How to Replace Water Heater Gas Control Valve

At Rooter Hero Plumbing of Phoenix, we take pride in our ability and preparedness to repair, replace, and install water heaters of all types. Our technicians deal with tank-style as well as tankless water heaters both electric and gas powered. We do not only offer services and repairs, though. We are also happy to provide tips and guides. In this article, we will review the water heater gas control valve and its replacement. If you are not confident in replacing the valve yourself, we urge you to call Rooter Hero Plumbing of Phoenix to hire a qualified plumbers. Gas-powered appliances and the gas itself can be dangerous and even fatal.

What Is the Gas Control Valve?

The gas control valve is a part of the burner assembly, usually found around the bottom of the water heater tank and connected to the manifold tube, pilot tube, and temperature probe. In short, it is an important component of the water heater, but what does it do?

The gas valve includes two or three knobs or buttons that are used to adjust the temperature and ignite the pilot. The water heater works until the set temperature is reached, then turns off.

Removing the Gas Control Valve

Before you work on a gas-powered water heater, make sure to turn off the gas. Turn the gas valve to the off position and turn the gas valve off on the line leading to the hot water tank. Next, cut off the water supply and drain the water tank. With the power and water supply cut, you are ready to remove the gas valve.

With the tank emptied, disconnect and remove the piezo igniter, manifold tube, thermal switches, and thermocouple carefully. You do not want to damage the thread. Finally, unscrew the valve making sure not to use a pipe wrench or place items into the inlet.

Installing the Gas Control Valve

Grab your Teflon tape or appropriate pipe compound to reconnect the gas control valve to the gas tube. When screwing the valve back on, be careful not to over-tighten as this can damage the valve and cause gas to leak. With the valve screwed in, you can now put back the piezo igniter, pilot tube, manifold tube, thermal switches, and thermocouple into their place. Check to make sure the combustion chamber is clean and free of debris before turning the water supply on and refilling the tank.

Finally, test the valve for leaks by applying foamy, soapy water. If you see bubbles, that can indicate a leak that should be fixed immediately. If the coast is clear, then you are ready to light the pilot. Once everything is ready, you can set the temperature. We do not recommend you set the temperature higher than 125 degrees.

Still Having Issues?

If you are still having issues, then keep calm and call Rooter Hero Plumbing of Phoenix. We are happy to schedule a flexible appointment or arrange an emergency dispatch. Our nearby plumbers can be at your location in as soon as within the hour.