How To Relight A Hot Water Heater?

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How To Relight A Hot Water Heater: A Step-by-Step Guide

Relighting a hot water heater can seem daunting, but it’s a manageable DIY task. Follow our comprehensive guide to learn how to relight a hot water heater safely and efficiently and restore hot water to your home.

Understanding Your Hot Water Heater

A hot water heater is a crucial appliance in any home, providing warm water for showers, dishwashing, and laundry. When the pilot light goes out, often due to a gas supply interruption or a draft, your hot water heater stops working. Understanding the basic components and how they function is essential before attempting to relight it.

Pilot Light: A small, continuous flame that ignites the main burner when hot water is needed.
Thermocouple: A safety device that senses the pilot light flame and allows gas to flow to the main burner. If the pilot light goes out, the thermocouple shuts off the gas supply to prevent leaks.
Gas Valve: Controls the flow of gas to both the pilot light and the main burner.
Burner: The main component that heats the water.
Temperature Control: Allows you to adjust the water temperature.

Safety First: Important Precautions

Before you begin, safety is paramount. Gas leaks are a serious hazard and can lead to explosions or carbon monoxide poisoning. Always adhere to these safety precautions:

Smell for Gas: If you smell gas, do not attempt to relight the water heater. Evacuate the area immediately and call your gas company or the fire department.
Ventilation: Ensure the area around the water heater is well-ventilated. Open windows and doors.
Turn Off the Gas: If you are unsure about any step, turn off the gas supply to the water heater at the gas valve.
Read the Instructions: Consult the manufacturer’s instructions specific to your model.
Carbon Monoxide Detector: Ensure you have a working carbon monoxide detector in your home.

Step-by-Step Guide: How To Relight A Hot Water Heater?

Follow these steps carefully to safely relight your hot water heater:

Locate the Gas Valve: Find the gas control valve on the water heater. It usually has settings like “Pilot,” “On,” and “Off.”
Turn to “Off”: Turn the gas valve to the “Off” position and wait at least five minutes to allow any accumulated gas to dissipate. This step is crucial for safety.
Locate the Pilot Light Assembly: This is typically located near the bottom of the water heater, often behind an access panel.
Set to “Pilot”: Turn the gas valve to the “Pilot” position.
Press and Hold: Press and hold the pilot button. This button allows gas to flow to the pilot light. You may need to hold it for 20-30 seconds.
Ignite the Pilot Light: While holding the pilot button, use a long lighter or match to ignite the pilot light. Some newer models have an electronic igniter button; use that if applicable.
Continue Holding: Continue holding the pilot button for another 20-30 seconds after the pilot light ignites. This allows the thermocouple to heat up and sense the flame.
Release the Button: Slowly release the pilot button. If the pilot light stays lit, proceed to the next step. If it goes out, repeat steps 5-7.
Turn to “On”: Once the pilot light stays lit, turn the gas valve to the “On” position. The main burner should ignite.
Check for Proper Operation: Observe the water heater for a few minutes to ensure it is operating correctly. Listen for the main burner to cycle on and off as needed.

Troubleshooting Common Issues

Sometimes, even after following the steps, the hot water heater may still not relight. Here are some common issues and how to troubleshoot them:

Dirty Pilot Orifice: A clogged pilot orifice can prevent the pilot light from staying lit. Try cleaning it with a thin wire or compressed air.
Faulty Thermocouple: If the pilot light goes out as soon as you release the pilot button, the thermocouple may be faulty and needs to be replaced.
Gas Supply Issues: Ensure the gas supply to your home is turned on and that there are no issues with your gas meter.
Drafts: Strong drafts can blow out the pilot light. Consider installing a draft shield around the water heater.

When To Call a Professional

While many homeowners can successfully relight their hot water heater, there are times when it is best to call a qualified professional.

Persistent Problems: If you have tried multiple times to relight the water heater and it still won’t stay lit.
Gas Leaks: If you suspect a gas leak, do not attempt to repair the problem yourself. Call your gas company or a qualified plumber immediately.
Unfamiliar Issues: If you encounter any unfamiliar noises, smells, or performance issues with your water heater.

How To Relight A Hot Water Heater? – A Summary Table

Step	Action	Safety Note
1. Locate Gas Valve	Find the control valve.	Ensure proper ventilation.
2. Turn to “Off”	Turn the valve to “Off” and wait 5 minutes.	Allow gas to dissipate.
3. Locate Pilot	Find the pilot light assembly.	Be aware of your surroundings.
4. Set to “Pilot”	Turn the valve to “Pilot”.
5. Press and Hold	Press and hold the pilot button.
6. Ignite Pilot	Use lighter or igniter to light the pilot.	Use a long lighter for safety.
7. Continue Holding	Hold the button for 20-30 seconds.	Allow thermocouple to heat up.
8. Release Button	Slowly release the button.	Pilot should stay lit.
9. Turn to “On”	Turn the valve to “On”.	Main burner should ignite.
10. Check Operation	Observe the water heater.	Listen for proper cycling.

FAQs – Your Hot Water Heater Questions Answered

Why does my hot water heater pilot light keep going out?

The pilot light can go out for several reasons, including a dirty pilot orifice, a faulty thermocouple, gas supply problems, or drafts. Addressing each of these potential causes will help you resolve the issue. A thorough inspection is recommended.

How can I tell if my thermocouple is bad?

A common symptom of a faulty thermocouple is the pilot light going out as soon as you release the pilot button. You can test the thermocouple with a multimeter, but it’s often easier and more cost-effective to simply replace it. Replace the thermocouple if the pilot doesn’t stay lit.

Is it safe to relight my hot water heater myself?

Yes, it is generally safe to relight your hot water heater yourself, provided you follow the safety precautions outlined in this guide. If you smell gas or are uncomfortable with any of the steps, call a professional.

What tools do I need to relight my hot water heater?

You will typically need a long lighter or match, and possibly a small wire or compressed air to clean the pilot orifice. A screwdriver may be necessary to remove the access panel.

How often should I have my hot water heater serviced?

It’s recommended to have your hot water heater serviced annually to ensure proper operation and prevent potential problems. This includes flushing the tank to remove sediment and inspecting all components.

What is the average lifespan of a hot water heater?

The average lifespan of a hot water heater is 8-12 years. Regular maintenance can help extend its lifespan.

Can I use a regular lighter to relight the pilot light?

While you can technically use a regular lighter, it is much safer to use a long lighter or match to avoid getting too close to the pilot light assembly.

What should I do if I smell gas near my hot water heater?

Immediately evacuate the area and call your gas company or the fire department. Do not attempt to relight the water heater or use any electrical devices.

How do I know if my hot water heater is leaking carbon monoxide?

The most reliable way is to have a working carbon monoxide detector in your home. Common symptoms include headache, dizziness, nausea, and fatigue.

How do I adjust the temperature on my hot water heater?

Locate the temperature control dial on the gas valve. Use a screwdriver to adjust the setting to your desired temperature. A temperature of 120°F (49°C) is generally recommended to prevent scalding and save energy.

What is the difference between a gas and electric hot water heater?

Gas water heaters use natural gas or propane to heat the water, while electric water heaters use electric resistance elements. Gas heaters typically heat water faster but may have higher operating costs depending on gas prices. Electric heaters are generally more energy-efficient but slower to heat water.

Where can I find the model number of my hot water heater?

The model number is typically located on a label on the side of the water heater. This information is crucial for ordering replacement parts or looking up specific instructions.