The best water heater pilot light assembly is the replacement that matches your heater’s exact model and original part number. The 100112330 assemblies are options for listed Whirlpool, A. O. Smith, American, and related models; the 9003542 is a natural-gas option with specified tube and lead lengths; and the SP20075 kits are intended for listed Rheem, GE, and Richmond heaters. Check the heater’s rating plate and existing part before ordering, especially to verify fuel type.
| Product | Best suited for | Key check |
|---|---|---|
| 100112330 / 9007876 assembly | Listed Whirlpool, A. O. Smith, American, and Reliance models | Confirm model and part number |
| 9003542 assembly | Listed natural-gas heaters | Check the replacement number and lead lengths |
| SP20075 kit | Listed Rheem, GE, and Richmond models | Verify the exact heater series |
| SP20075 / SP20305A kit | Listed Rheem, GE, and Richmond models | Match a listed replacement number |
| Pulaim 100112330 assembly | Listed natural-gas Whirlpool and related heaters | Not compatible with propane, per listing |
100112330 Water Heater Pilot Assembly
This assembly is listed as a replacement for 100112330 and 9007876-style pilot assemblies, with compatibility information covering selected Whirlpool, American Water Heater, A. O. Smith, and Reliance models. Its model list includes Whirlpool N-series heaters and A. O. Smith GS6-300, GCV-300, GPX-300, GVK-300, and XCZ-300 series.
Best for: Owners whose heater’s exact model appears in the supplied compatibility list. It is a useful choice when replacing a matching assembly in one of the listed brands or model families.
Why it was selected: The listing provides multiple model-specific compatibility examples rather than naming only a broad brand family. Check the complete heater model and the original part number before ordering; a shared brand name alone does not establish fit.
Limitation: The compatibility information is model-specific, and the listing does not establish compatibility with every heater from the named brands.
9003542 Natural-Gas Pilot Assembly
The 9003542 is described as a pilot assembly for natural-gas water heaters. The listed dimensions are a 22-inch gas pilot tube, a 22.5-inch thermocouple, and a 21.5-inch ignitor. Listed replacement numbers include 100109295, 183824-190, 9003530, 9003542005, and AP4867015.
Best for: Buyers with a natural-gas heater whose original part number matches one of the listed replacements. Its stated tube and lead lengths also give buyers specific details to compare against the existing assembly.
Why it was selected: The listing identifies the fuel type, several replacement numbers, and component lengths, making it easier to perform a parts-based comparison. It names Reliance, A. O. Smith, Kenmore, and State GS and GSX heaters as compatible families.
Limitation: It is specified for natural gas. The listing advises checking both the part number and appearance, so do not rely on brand alone.
SP20075 Pilot and Igniter Kit
This SP20075 replacement kit is listed for selected Rheem, GE, and Richmond water heaters. The compatibility details include Rheem models such as RHG PRO50-40F and 42V40F, along with several Fury and Professional series model numbers. The listing also says the kit includes a burner door gasket.
Best for: Owners of a listed Rheem, GE, or Richmond model who need a pilot and igniter assembly and want a kit that lists a burner door gasket as included.
Why it was selected: Its detailed model list helps buyers compare a specific heater against the product information instead of assuming that every model in a brand line uses the same assembly. The listing describes the kit as intended to address pilot-related ignition or flame-holding problems.
Limitation: Compatibility is not universal across Rheem, GE, or Richmond heaters. Confirm the complete model number before purchase, and do not treat a symptom by itself as proof that this is the correct replacement.
SP20075 and SP20305A Replacement Kit
This pilot and igniter replacement kit lists SP20075 and SP20305A as replacement numbers. Its compatibility examples include specified Rheem, Fury, and Professional models, as well as the listed GE and Richmond heater families. The product description mentions a heat-resistant ceramic insulator, corrosion-resistant metal components, and a brass pilot tube.
Best for: Buyers whose original assembly or heater documentation identifies SP20075 or SP20305A and whose exact model appears in the listed compatibility information.
Why it was selected: The two stated replacement numbers and extended model list provide practical details for comparing this kit with the original part. The described materials may also help buyers identify whether the listed assembly matches the type of component they are replacing.
Limitation: The description does not make the kit a fit for every natural-gas heater. Confirm the part number and model; listed construction details are not a substitute for fit verification.
Pulaim 100112330 Pilot Assembly
This 100112330 assembly is listed as replacing part numbers including 1100112330, 9007876, and 9007877. The compatibility information names Reliance, Whirlpool, A. O. Smith, Kenmore, State, and American water heaters, with specific Whirlpool N-series and other model examples.
Best for: Buyers with a listed heater model and a matching 100112330-family original part. It is a particularly clear option to consider when the original number or a listed replacement number matches the product details.
Why it was selected: The listing supplies model examples and states that the assembly is intended for heaters with problems such as an indicator light that will not stay lit or a heater that will not heat due to thermocouple damage.
Limitation: The listing explicitly says it is not compatible with propane water heaters. Verify fuel type, part number, and assembly dimensions before ordering.
Buying Guide: How to Choose a Water Heater Pilot Assembly
How do you identify the correct replacement part?
Start with the heater’s rating plate, which identifies the appliance model. Then check the existing pilot assembly, its label if present, and the heater’s parts documentation for a part number. Compare those details with the replacement listing. A product that names the heater brand but does not list the exact model or a matching part number may not be the right fit.
Pay attention to suffixes and series designations in model numbers. Two heaters from the same manufacturer may use different assemblies. If the original number is unreadable, use the full heater model to seek confirmation from the manufacturer or a qualified service professional rather than guessing based on appearance alone.
Does the assembly match the heater’s fuel type?
Fuel type is a critical filter. The 9003542 listing specifies natural gas, and the Pulaim 100112330 listing explicitly excludes propane. Do not assume that a natural-gas part will work with a propane appliance, or that a part described for one fuel type is suitable for another. Confirm the fuel type on the heater’s rating plate and in its documentation.
Should you compare the original part number or physical dimensions?
Use both when the product details provide them. A matching replacement number is a strong way to narrow the selection, while measurements can reveal differences in tube or lead length. For example, the 9003542 listing provides lengths for its pilot tube, thermocouple, and ignitor. Similar-looking assemblies can still differ, so appearance alone is not enough to establish compatibility.
What symptoms mean a pilot assembly may need attention?
A pilot that will not light or stay lit can be associated with a faulty assembly, but a symptom does not identify the failed component by itself. The product listings mention ignition problems, a flame that will not remain lit, and an indicator light that is off. Other heater components or conditions may also need diagnosis. Follow the appliance manual and use a qualified technician if the cause is unclear.
When should you call a professional?
Water heater gas components require careful handling. If you smell gas, do not attempt to diagnose or replace the assembly; leave the area and contact the appropriate gas utility or emergency service from a safe location. For other repairs, follow the manufacturer’s instructions and local requirements. If you are not trained to work on gas appliances, have a qualified professional inspect and replace the part.
What should buyers compare across these options?
- Part number: Match the original or an explicitly listed replacement number.
- Heater model: Check the full model, including series and suffixes.
- Fuel type: Confirm natural gas or propane compatibility from reliable product and appliance documentation.
- Included components: Check whether the listing identifies an igniter, thermocouple, pilot tube, or gasket.
- Physical details: Compare listed lengths and the original assembly where applicable.
- Brand coverage: Treat brand names as starting points, not proof that every model fits.
Frequently Asked Questions
Can I choose a pilot assembly based only on the water heater brand?
No. A brand can have multiple models and assembly types. Confirm the full heater model and replacement part number against the listing.
Are all water heater pilot assemblies compatible with propane?
No. Fuel compatibility varies. The Pulaim 100112330 listing specifically says it is not compatible with propane, and the 9003542 listing specifies natural gas.
What does a 100112330 or 9007876 part number indicate?
These numbers are associated with the 100112330-family assembly described in the relevant product listings. Check your original part number and heater model before treating a replacement as compatible.
Will a new pilot assembly fix a pilot that will not stay lit?
It may help if the assembly is faulty, but the symptom alone does not confirm the cause. Diagnose the heater using its service instructions or consult a qualified professional.
What should I do if the replacement looks similar but has a different number?
Do not assume that it fits. Compare the exact heater model, original part number, fuel type, and any listed dimensions. Seek manufacturer or professional confirmation if those details do not match.