Lighting the pilot on a Rheem gas water heater is a common maintenance task that ensures hot water is available when needed. This guide explains a safe, step-by-step process to light the pilot, identify common issues, and perform basic troubleshooting. It also clarifies differences between gas models with pilots and electric Rheem units, helping users choose the right approach for their appliance.

Overview Of Rheem Pilot Lighting

Rheem gas water heaters with a standing or intermittent pilot flame use a control valve assembly that includes a pilot tube, thermocouple, and an ignition system. The pilot provides a small flame that heats the thermocouple, signaling the gas valve to stay open. If the pilot goes out, the gas valve closes for safety. The lighting procedure varies slightly by model, but generally follows a consistent sequence involving turning the control to Pilot, initiating ignition, and holding the knob until the flame stays lit.

Safety Precautions

Before attempting to light or relight a pilot, observe these safety steps. If you smell gas, evacuate the area and contact the gas company or emergency services immediately. Do not ignite cigarettes or flames near the heater. Ensure the area around the unit is well-ventilated and clear of combustible materials. If the water heater has a sealed access panel, open it to access the control valve. Do not attempt to operate a damaged or flooded unit. If unsure, contact a licensed technician for service.

When To Light The Pilot

Light the pilot when the flame is out, the water heater is not producing hot water, or after maintenance that requires disconnecting the gas supply. Do not attempt to light the pilot if the unit shows signs of damage, persistent gas odor, unusual noises, or if the standing pilot has extinguished repeatedly. For new installations, follow the manufacturer’s specific instructions included with the model.

Steps To Light The Pilot (Gas Models)

Note: These steps apply to many Rheem gas water heaters with a standing pilot. If the model uses an electronic ignition or a different procedure, refer to the user manual.

Turn the thermostat knob to the Off position, then wait 5 minutes to dissipate any gas accumulation.
Turn the knob to Pilot and press and hold the control knob down continuously.
If there is a separate ignition button, press or click it to ignite the pilot flame. If the unit uses a piezo ignition, you may hear a click as it sparks.
Observe the pilot flame through the viewing window or opening. Hold the knob in the Pilot position for about 30 to 60 seconds to heat the thermocouple.
Release the knob slowly to the On position. The main gas valve should open, and the burner should ignite. If the flame goes out, repeat the process once more.
Close any access panels and set the thermostat to the desired temperature, typically around 120°F (49°C).

What If The Pilot Won’t Light Or Stay Lit?

Several common causes may prevent lighting or staying lit. Check each item before calling a technician.

Gas supply—Ensure the gas valve to the heater is fully open and that the home gas supply is active.
Thermocouple—A dirty or faulty thermocouple can fail to signal the valve to stay open. Clean gently with a cloth or replace if damaged.
Pilot tube—A clogged pilot tube or orifice can impede gas flow. If accessible, clear any debris using a soft brush or compressed air (carefully).
Ignition system—A malfunctioning igniter may fail to light the pilot. Some units rely on manual lighting with a match; others require a built-in igniter. If ignition fails, replacement may be needed.
Ventilation—Poor venting can cause the pilot to extinguish. Ensure the venting path is clear and unobstructed.

Electric Rheem Water Heaters

Rheem also manufactures electric water heaters that do not use a pilot flame. These units rely on electric heating elements and a thermostat. If an electric model loses hot water, troubleshooting focuses on the electrical supply, circuit breakers, the upper and lower heating elements, and the thermostat. Always shut off power at the breaker before inspecting electrical components to avoid shock or injury.

Maintenance And Troubleshooting Tips

Regular maintenance helps prevent pilot-related issues and extends the life of the unit. These practices are generally applicable across many Rheem models.

Annual inspection—Check the venting for blockages, inspect the shutoff valve, and confirm there are no gas leaks (using approved methods).
Thermocouple health—Inspect and replace if bent, corroded, or damaged. A healthy thermocouple ensures reliable ignition.
Gas pressure—If the heater struggles to stay lit, contact the gas provider to test pressure and ensure it meets specifications.
Cleanliness—Keep the area around the heater free of dust and debris that could affect burners or igniters.
Flue and vent inspection—Ensure the exhaust vent is clear to prevent flame instability and CO buildup.

Common Model Variations

Rheem models vary in their ignition systems and control panels. Some use an electronic pilot with a spark igniter, while older units rely on manual lighting. The location of the access panel, the presence of a standing pilot, and the sequence to light can differ. Always consult the user manual for model-specific instructions and safety warnings.

Tips For Efficient Operation

Set temperature—A setting around 120°F provides hot water while reducing energy consumption.
Insulation—Wrap the first 6 feet of hot and cold water pipes with insulation to minimize standby heat loss.
Leak checks—Periodically inspect for leaks around the tank, connections, and gas line to prevent hazards.
Drain valve—Regularly drain a few gallons to remove sediment if recommended by the manufacturer.

FAQs

Can I relight the pilot if I smell gas? No. If gas odor is detected, leave the area immediately and contact the gas company or emergency services.
Is it safe to light the pilot myself? With proper precautions and model-specific instructions, many homeowners can relight the pilot. If the process seems unclear or the pilot repeatedly goes out, hire a licensed technician.
What temperature setting is safest for a Rheem water heater? Around 120°F (49°C) balances comfort and energy efficiency, while reducing the risk of scalding.
My electric Rheem heater has no hot water—what should I check? Check the circuit breaker, test both heating elements, and inspect the thermostat for proper operation.