Best Pilot Assembly Replacements for Natural Gas Water Heaters
For homeowners with natural gas water heaters, a reliable ignition system is essential for steady hot water. If your unit shows intermittent heating or ignition issues, replacing the pilot assembly can restore performance without replacing the entire heater. The following selections cover compatible, high-quality options from trusted brands, designed to fit popular Reliance, A.O.Smith, Kenmore, State GS/GSX models and more. Each product includes practical installation notes and compatibility details to help you compare at a glance.
| Product | Brand | Key Feature | Compatible Models |
|---|---|---|---|
| 9003542 Pilot Assembly Replacement for Natural Gas Water Heater | Lamudo | New upgrade, includes 22″ gas pilot tube, thermocouple, ignitor | Reliance, A.O.Smith, Kenmore, State GS/GSX; replaces 100109295, 183824-190, 9003530, 9003542005, AP4867015 |
| Long Term 9003542 Pilot Assembly Replacement for Natural Gas Water Heater | Long Term | Solves common ignition and heating issues; full replacement set | A.O.Smith FCV/GCV/GVR/XCV/XVR; Kenmore 153; State GS/GSX |
| Water Heater Pilot Assembly With Pilot Thermocouple and Tubing Natural Gas | TUAIC | 24 inch pilot tube and thermocouple included; broad compatibility | Various gas water heaters; compatible with many models but verify exact fit |
| Water Heater Pilot Assembly, 24” Pilot Thermocouple for Gas Water Heaters | Granatan | 24-inch thermocouple length; reliable replacement part | RLP55V, RLP125V, REM55PV, REM125PV, and other listed models |
| ThermoMate CZ422NG Natural Gas Tankless Water Heater | ThermoMate | Up to 5 GPM with advanced safety features; on-demand hot water | Indoor residential gas tankless water heater (multi-point heating) |
Note: All product descriptions are provided by sellers. Always verify compatibility with your specific water heater model before purchase. Some listings warn that installation should be performed by qualified personnel, especially when dealing with gas connections.
Lamudo 9003542 Pilot Assembly Replacement
- Brand: Lamudo
- New Upgraded Replacement for NAT gas water heaters
- Includes 22″ gas pilot tube, 22-1/2″ thermocouple, 21-1/2″ ignitor
- Compatible with Reliance, A.O.Smith, Kenmore, State GS/GSX (replaces 100109295, 183824-190, 9003530, 9003542005, AP4867015)
Long Term 9003542 Pilot Assembly Replacement
- Brand: Long Term
- Solves common gas water heater ignition issues
- Replaces 9003542, 183824-190, 9003530, 9003542005, 100109295, AP4867015
- Compatible with A.O.Smith FCV/GCV/GVR/XCV/XVR and State/ Kenmore models
TUAIC Water Heater Pilot Assembly With Thermocouple
- Brand: TUAIC
- Pilot assembly with thermocouple and tubing
- Standard 24-inch length; broad compatibility
Granatan Water Heater Pilot Assembly
- Brand: Granatan
- 24-inch pilot thermocouple compatible with many gas water heaters
- Fits models such as RLP55V, REM55PV, and additional listed units
ThermoMate CZ422NG Tankless Water Heater
- Brand: ThermoMate
- Natural gas tankless unit; up to 5 GPM
- Indoor installation; multi-point heating capability
EXCEL Propane LPG Tankless Gas Water Heater
- Brand: EXCEL
- Compact propane/LPG tankless unit; starts with 15 PSI water pressure
- Space-saving design for on-demand hot water
FOGATTI Natural Gas Tankless Water Heater Indoor
- Brand: FOGATTI
- Max 7.5 GPM, 170,000 BTU; CSA certified
- Compact design for indoor installation
Buying Guide: Pilot Assembly Upgrades For Natural Gas Water Heaters
Key considerations
Compatibility: Confirm model numbers and serials of your water heater to ensure the pilot assembly fits. Look for part numbers such as 100109295, AP4867015, and related references listed by manufacturers.
Gas supply and safety: Replacing a pilot assembly involves working with gas lines. Ensure the gas supply is shut off and follow all safety guidelines. Some listings recommend professional installation.
Length and components: Many pilot assemblies include the thermocouple, igniter, and pilot tube lengths (commonly 22-24 inches). Verify the exact lengths and included components to match your unit’s configuration.
Durability and warranty: Choose replacements built for NAT gas heaters with durable materials. A 12-month or longer warranty offers protection against premature failures.
Compared options
- OEM-like compatibility: Lamudo and Long Term offer replacements designed to fit popular Reliance, A.O.Smith, Kenmore, and State GS/GSX models, often covering multiple part numbers.
- Versatility: Granatan and TUAIC provide flexible compatibility across several gas heater families, with longer pilot tubes or complete assemblies to address ignition issues.
- Tankless alternatives: If you are considering upgrading to a tankless gas heater, ThermoMate, EXCEL, and FOGATTI options provide compact, on-demand hot water solutions, though they shift away from pilot assemblies to entire systems.
Installation guidance
Prepare tools such as a screwdriver and pliers. Before replacement, isolate and verify gas lines, follow proper venting and clearance guidelines, and consult your heater’s manual for any model-specific steps.
Safety and maintenance considerations
- Inspect the gas shut-off valve and ensure a proper gas leak test after installation.
- Keep a record of replacement parts and dates for future service references.
- Consider professional servicing if you notice ongoing ignition problems after replacement.