How to Relight a Pilot Light on Hot Water System

By
Ben Rayner
January 6, 2026
•
5 min read
Relighting pilot light on hot water system

Relighting the pilot light is a simple process that can be done by following a few steps.

If you have a gas hot water system, you may wonder: How do I reignite the pilot light on my hot water system? If your hot water unit has started giving you cold showers and you suspect the pilot light is out, don't worry! Relighting it is a straightforward task you can manage on your own. Our helpful plumbers have put together this step-by-step guide to help you. By following these steps, you can safely get your hot water flowing again.

STEPS TO RELIGHT THE PILOT LIGHT ON YOUR HOT WATER SERVICE

1. Locate the pilot light

The first step is to identify where your pilot light is on your hot water service. Generally, it's positioned below the gas control valve. Refer to your hot water unit's user manual if you're unsure.

2. Turn off the gas control knob

Ensure you switch off the gas control knob on your hot water service. It's vital to make this a priority for your safety.

3. Wait for the gas to disperse

Allow 5-10 minutes for any gas to clear out before you attempt to light the pilot. This is crucial to avoid the risk of gas buildup leading to a potential explosion.

4. Light the pilot

‍With a matchstick or ignited lighter, light your pilot light. If your hot water system has an ignitor button, use that instead.‍

5. Check for a blue flame‍

Once you've ignited the pilot, there should be a blue flame. If the flame is yellow or orange, it means there's an issue that needs professional assistance.

6. Turn on the gas knob‍

Once you're sure the flame is blue, turn on the gas control knob again. After this, your hot water unit should start operating normally. If there's still no hot water, it might be time to call in a professional.

Relighting the pilot light is a basic process, but it involves natural gas, a potentially dangerous substance if not handled properly. Please approach the task with caution. If you have any uncertainty at all about this process, it's best to leave it to a professional.
Relighting pilot light on hot water service

Pro tips for relighting your pilot light

Remember, the safety of you and those in your household is paramount. If you're unsure about any step of the process, be sure to call a professional plumber.

  • If your hot water service's pilot light frequently goes out, there could be a deeper issue with the unit that a professional will need to check.
  • Always remember to turn off the gas before igniting the pilot light for your safety.
  • When turning the gas back on, do it slowly.

By following these steps, you can easily reignite the pilot light of your hot water service and enjoy warm, relaxing showers once more. Stay safe and stay warm!

At Outright Plumbing, we recommend scheduling annual maintenance for your hot water system to increase its lifespan and prevent potential problems. This ensures that your hot water system is operating efficiently, saving you from an exorbitant gas bill and the cost of replacing your system prematurely. When we arrive at your home, we will thoroughly assess your hot water system to ensure there are no other issues, giving you total peace of mind. 

Need to talk to an expert?

Our South Melbourne team of qualified, expert plumbers are here to help; Contact us today!

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