The pilot light on a gas water heater can provide reliable hot water when electronic ignition isn’t available or when a unit relies on a standing pilot. This guide explains how to safely locate the control components, light the pilot, and start hot water production. It covers standing-pilot and ignition-type models, safety precautions, troubleshooting tips, and routine maintenance to prevent future lighting issues.

Why A Pilot Light Matters On A Gas Water Heater

A pilot light is a small flame that ignites the main burner when hot water is needed. In older homes or certain models, the pilot must be lit to initiate heating. Modern units may feature electronic ignition, but many systems still rely on a standing pilot. Knowing how to turn on the pilot light ensures continuous hot water and can prevent cold-water shocks or pressure-related issues caused by a failed ignition.

Safety First Before Lighting A Pilot Light

Gas appliances require caution. Before attempting to light the pilot light, ensure the area is well-ventilated and free from flammable materials. If you smell gas (a distinctive rotten-egg odor), do not light anything. Leave the area and contact the gas utility or emergency services. Turn the gas control valve to the OFF position and wait a few minutes to allow gas to dissipate. Never skip the manufacturer’s instructions. If you feel uncertain, call a licensed plumber or gas technician.

Tools And Materials You Might Need

Typically, no tools are required beyond your hands, but having these can help:

Flashlight to inspect the burner and vents
Clean, dry rags to wipe surfaces
A long lighter or match striker if necessary
Gloves for warmth and grip
Owner’s manual or model-specific lighting instructions

Step-By-Step: Lighting A Standing Pilot Light On A Gas Water Heater

Follow these general steps for standing-pilot models. Always cross-check with the manufacturer’s instructions.

Turn the thermostat knob to OFF. Wait five minutes to clear residual gas.
Turn the gas control valve to OFF, then remove the access panel on the water heater’s front.
Locate the piezo or pilot assembly. Identify the pilot gas line and the burner beneath the access panel.
Turn the gas control knob to PILOT. You should hear a small hiss. Keep holding the knob in the PILOT position.
Press and hold the reset/ignition button (if present) or use a long lighter near the pilot opening while you ignite the pilot with a match or striker.
Continue to hold the control knob in the PILOT position for about 30-60 seconds after the flame lights, then release slowly.
Turn the control knob to ON and set the thermostat to your desired temperature (hot water is typically set around 120°F).
Replace the access panel and confirm the burner ignites when hot water is requested. If the burner does not ignite, turn OFF again and wait a few minutes before retrying.

Step-By-Step: Lighting A Pilot With Electronic Ignition

For models with electronic ignition, the process differs slightly and may not require a standing pilot.

Turn the thermostat to OFF and allow the unit to cool for a few minutes.
Open the access panel and locate the ignition system and thermocouple.
Turn the gas control to OFF, then to ON or IGNITE as indicated by the manufacturer.
Use the electronic spark to ignite the burner or press and hold the ignition button until the burner lights.
Allow the flame to stabilize for several minutes, then set the thermostat to the desired temperature.

Common Issues When Lighting A Pilot Light

If the pilot light won’t stay lit or won’t ignite, consider these possibilities:

Thermocouple or flame sensor is dirty or misaligned—gently clean or adjust as instructed by the manual.
Gas supply valve not fully open—ensure it’s in the ON position and the supply line is unobstructed.
Blocked vent or partially clogged burner—inspect and clean as necessary to maintain safe ventilation.
Thermostat or gas control valve malfunction—these components may require professional testing and replacement.

Troubleshooting Tips To Save Time And Money

Begin with the simplest checks: ensure the gas supply is active, confirm the thermostat is set appropriately, and verify that the pilot tube is free of debris. If accessible, inspect the thermocouple for signs of wear or corrosion and replace if necessary. A pilot that lights but goes out shortly after suggests a weak thermocouple or improper gas pressure. In such cases, call a licensed technician to inspect gas pressure, venting, and safety controls. Regular maintenance, including annual inspections, can prevent many failures.

Maintenance Tips To Keep The Pilot Light In Good Condition

Regular maintenance helps prevent pilot lighting issues and extends the life of the water heater. Schedule annual professional inspections, especially for older units. Clean the burner and pilot assembly to remove dust and debris. Check the venting system for obstructions or corrosion, and ensure the exhaust path remains clear. Replace worn parts like the thermocouple, gas control valve, and main burner components as recommended by the manual. Keep the area around the water heater unobstructed to allow proper airflow and safe operation.

When To Call A Pro

If lighting the pilot light safely is not possible, or if the unit repeatedly fails to stay lit after following the manual instructions, contact a licensed gas technician. Seek professional help promptly if you detect gas smells, hear hissing, or notice carbon monoxide symptoms such as headaches, dizziness, or confusion. Gas appliances should be serviced by professionals to ensure safe operation and to comply with local codes and warranties.

Additional Resources And Helpful References

Refer to the specific model’s owner’s manual for model-specific steps and safety advisories. Manufacturer websites and consumer protection agencies offer troubleshooting guides and recall notices that may affect your water heater. For readers in the United States, contact regional utility providers for gas service questions and safety tips. Keeping a detailed maintenance log helps track service dates, part replacements, and thermostat changes for ongoing reliability.