How to replace a water heater gas valve: A step-by-step guide

When your gas water heater stops functioning properly, one of the potential culprits could be the gas valve. The gas valve controls the flow of gas to the burner, ensuring that your water heater operates safely and efficiently. If the valve malfunctions, it can prevent the burner from igniting or cause the pilot light to go out, leaving you without hot water.

If you need any replacement parts for your appliances, you can enter your model number at AppliancePartsPros.com to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.

Important: The information provided in this article may not apply to your specific appliance model. While we strive to offer helpful advice for DIY appliance repairs, variations in models and configurations can lead to differences in troubleshooting steps, error codes and part replacements. For the most accurate guidance, we strongly recommend consulting the technical sheet for your specific appliance model.

Common reasons for water heater gas valve failure

The gas valve on a water heater is designed to last for many years, but like any part, it can wear out or malfunction over time. Here are some common reasons why the gas valve for your water heater might fail:

1. Wear and tear

Over time, the internal components of the hot water heater gas valve can wear out due to constant exposure to heat and gas. This can cause the valve to malfunction, preventing the burner from igniting or causing the pilot light to extinguish frequently.

2. Thermostat failure

The thermostat on the gas valve regulates the water temperature. If the thermostat becomes faulty, it may prevent the burner from operating, leading to inconsistent water temperature or no hot water at all. In such cases, replacement of the thermostat is necesary

3. Blockages or dirt buildup

Dirt or debris in the gas line or the valve itself can prevent gas from flowing properly, which can cause ignition problems or prevent the water heater from producing hot water. Cleaning or replacing the gas valve on the water heater may be required to restore proper function.

4. Pilot light or thermocouple issues

Sometimes, a faulty thermocouple or pilot light issue might be misdiagnosed as a gas valve problem. Always check the thermocouple and pilot assembly before deciding on a gas valve replacement.

What you’ll need

• Adjustable wrench
• Pipe wrench
• Screwdriver
• Replacement water heater gas valve (compatible with your water heater model)
• Teflon tape or pipe sealant
• Bucket or hose for draining the tank

How to replace a water heater gas valve

Replacing a water heater gas valve may seem daunting, but with the right tools and instructions, it’s a manageable DIY task. Follow these steps to safely replace the gas valve on your water heater.

Step 1: Turn off the gas and water supply

1. Turn off the gas supply to the water heater by switching the gas valve to the “off” position.
2. Turn off the cold water supply to the tank.
3. If your water heater is electric, ensure the power is off as well.

Step 2: Drain the tank

1. To safely remove the gas valve water heater, you’ll need to drain the tank.
2. Attach a garden hose to the drain valve and direct it to a suitable drainage location.
3. Open the drain valve and allow the tank to empty.

Be cautious, as the water may be hot.

Step 3: Disconnect the gas line

1. Using an adjustable wrench, carefully disconnect the gas line from the water heater gas valve.

Step 4: Remove the old gas valve

1. Next, use a pipe wrench to unscrew the old gas valve from the water heater.
2. Once removed, inspect the area around the valve for any signs of corrosion or damage.

Step 5: Install the new gas valve

1. Wrap the threads of the new hot water heater gas valve with Teflon tape or apply pipe sealant.
2. Carefully screw the new valve into the water heater.
3. Tighten it securely using a pipe wrench.
4. Ensure the valve is aligned correctly with the gas line.

Step 6: Reconnect the gas line

1. Reconnect the gas line to the new valve, ensuring that the connections are secure.
2. Double-check for any gas leaks after installation.

Step 7: Refill the tank and test

1. Once the valve is in place, close the drain valve.
2. Refill the tank by turning the cold water supply back on.
3. After the tank is full, turn on the gas supply.
4. Relight the pilot light according to the manufacturer’s instructions.
5. Test the water heater to ensure everything is functioning properly.

If your water heater is still not working correctly after replacing the gas valve, check out our guide on troubleshooting water heater issues.

People also ask

How do I know if my water heater gas valve is bad?

A bad water heater gas valve can prevent the burner from igniting or cause issues with the pilot light staying lit. If you’re experiencing inconsistent water temperatures, frequent pilot light issues, or no hot water at all, it could indicate that the gas valve needs to be replaced.

How much does it cost to replace a gas valve on a water heater?

The cost of gas water heater gas valve replacement typically ranges from $100 to $300, depending on the brand and model. Labor costs may vary if you hire a professional.

Can I replace the gas valve on my water heater myself?

Yes, replacing the gas valve for a water heater is a DIY task that most homeowners can handle with the right tools and safety precautions. Be sure to turn off the gas and water supplies before beginning the replacement.

How long does a water heater gas valve last?

A water heater gas valve can last for many years, but it may wear out over time due to constant exposure to heat and gas. On average, a gas valve may last around 10 to 15 years.

What brand of gas valve should I use for my water heater?

The brand of gas valve you need will depend on the manufacturer of your water heater. Common brands include Honeywell water heater gas valves and Bradford White water heater gas valves. Always check your water heater’s model for compatibility before purchasing a replacement.

Wrapping up

Thank you for reading! We hope this guide helped you get your water heater working again.

If you have any other appliance repair needs or projects, don’t hesitate to explore our other troubleshooting guides and videos.

If you need replacement parts or some extra help with ordering them, grab your model number and head over to AppliancePartsPros.com, where you can chat with a pro, read our DIY blog and more.

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