The best pilot thermopile assembly kit for a natural gas water heater is one that matches the heater’s exact model, replacement part number, connector, and burner configuration. The Pulaim, ENRUIEER, and Saiyugty kits are listed for selected 100112330-style systems; the two SP21058 kits are listed for Rheem-family models. Check your water heater’s label and existing part before ordering, because similar-looking pilot assemblies may not interchange.
| Product | Best suited for | Key fit check |
|---|---|---|
| Pulaim 100112330 Assembly | Selected Whirlpool and related 300/301-series models | Natural gas only; verify part number |
| SP21058 Assembly With Sparker | Listed Rheem, Ruud, and Richmond models | Check electrical thermocouple connection |
| ENRUIEER 100112330 Assembly | Specified Whirlpool and American models | Natural gas only; check connector and configuration |
| Saiyugty 100112330 Assembly | Selected Kenmore and related models | Confirm exact model and replacement number |
| SP21058 Rheem Kit | Rheem models using listed SP part numbers | Verify kit contents and gas setup |
Pulaim 100112330 Water Heater Pilot Assembly
This pilot assembly is listed as a replacement for 100112330 and several related part numbers, including 9007876 and 9007877. The supplied compatibility information names selected Whirlpool models and water heaters from Reliance, A.O. Smith, Kenmore, State, and American. Its stated model list includes examples such as N40T61-403 and N50T61-403.
Best for: Owners of a listed natural gas water heater who have confirmed the original part number and model. It is a relevant option for buyers seeking a 100112330-style assembly for a compatible 300 or 301 series heater.
Selection reason: The listing provides replacement numbers and specific model examples, making it easier to compare the kit against the heater’s label and existing assembly.
Limitation: The listing explicitly says it is not compatible with propane water heaters. It also cautions that parts with similar appearances can differ in size or shape. Do not order based on appearance alone.
SP21058 Pilot Assembly With Thermopile And Sparker
This kit is listed for models SP20824, SP20754, SP21058, SP21059, and SP20800, and for compatible Rheem, Ruud, and Richmond water heaters. The listing identifies it as a natural gas kit and says it includes a pilot assembly with thermopile, a sparker, mounting screws, an LP burner orifice, and an orange outdoor flame arrestor with hardware. It gives a 24.2-inch terminal-to-valve line and a 28.5-inch electrode wire.
Best for: Buyers whose heater uses one of the stated SP part numbers and whose existing thermocouple connection matches the kit’s electrical connection. The listed lengths and included components can help with a careful parts comparison.
Selection reason: It is presented as a multi-component replacement kit rather than a pilot assembly alone.
Limitation: The LP orifice is included, but the listing also identifies the kit as natural gas. Confirm the correct configuration for your heater and do not assume the included orifice makes the assembly suitable for a different gas type. Verify the connection before ordering.
ENRUIEER 100112330 Pilot Assembly With Thermopile
This natural gas assembly is listed with a 750mV thermopile and as a replacement for 9007876 and 4067826. Its compatibility information names selected Whirlpool and American water heater models, including N30T61-303, N40T61-403, and N50T61-403. The listing says it is designed for natural gas only and asks buyers to compare the original part number, connector, and assembly configuration.
Best for: Owners of a named Whirlpool or American model who are replacing a matching natural gas assembly. The model examples and stated thermopile output provide useful details for checking the original part.
Selection reason: The listing gives both replacement numbers and a relatively specific set of model references, which supports a model-by-model fit check.
Limitation: It is not listed for LP or propane. Compatibility with a brand alone is not enough to confirm fit; match the full model number and connector before purchase.
Saiyugty 100112330 Natural Gas Pilot Assembly
This assembly is listed as a natural gas replacement for 100112330, 9007876, and 9007877. The supplied information names a large range of Kenmore model numbers and identifies compatibility with several related water heater brands. The listing describes symptoms it is intended to address, including a pilot that will not stay lit, intermittent heating, and ignition problems attributed to assembly or thermocouple issues.
Best for: Buyers whose Kenmore model or original assembly number appears in the product listing. The broad model-number list may be useful when a heater label contains a specific Kenmore model rather than a generic series name.
Selection reason: It supplies multiple replacement numbers and extensive model references, supporting a detailed lookup before ordering.
Limitation: The provided feature details do not establish compatibility with every water heater from the named brands. Confirm the exact model, gas type, connector, and assembly shape rather than relying on the symptom description.
SP21058 Pilot Assembly Kit For Rheem Heaters
This kit is listed as a replacement for SP20824, SP20754, SP21058, and SP21059. Its stated contents include a pilot assembly, thermopile, spark igniter, LP orifice, mounting screws, and flame arrestor. The listing says the components undergo ignition, welding, and leak testing, and describes the thermopile as providing millivolt output for gas valve activation.
Best for: Rheem water heater owners whose existing assembly uses one of the listed SP numbers and who need the included ignition and mounting components as well as a thermopile.
Selection reason: Its replacement-number list and stated all-in-one contents make it a direct comparison option for the other SP21058-style kit above.
Limitation: The listing does not provide model-by-model compatibility details in the supplied information. It also includes an LP orifice, so confirm the correct natural gas configuration before selecting or installing the kit.
Buying Guide: How To Choose A Natural Gas Pilot Thermopile Kit
How do you confirm the correct replacement part?
Start with the water heater’s rating plate, usually found on the exterior of the tank or near the burner access area. Record the complete model number, not just the brand or series. Then compare it with the kit’s listed model numbers and the part number on the existing pilot assembly, if it is readable. Replacement numbers such as 100112330 or SP21058 can help narrow the search, but they do not prove that every version fits every heater.
Check the assembly itself for connector style, wire routing, mounting points, pilot tube arrangement, and physical shape. If the product listing specifically provides wire lengths or a connector requirement, compare those details with the original. A small difference can prevent a correct installation, even when two assemblies look similar.
Does the kit match natural gas or propane?
Gas type is a primary fit requirement. Some kits here are explicitly described as natural gas only and not compatible with LP or propane. Other listings mention an LP orifice as an included component, which makes it especially important to confirm the intended setup for your particular heater. Do not assume an extra orifice changes a kit’s compatibility or that a part described for one fuel can be used with another.
Use the water heater’s label and the replacement part documentation to confirm fuel type. If the label, existing assembly, and product information do not agree, stop and ask the manufacturer or a qualified service professional to identify the correct part.
What should you compare between SP21058 and 100112330 kits?
These part-number families are not interchangeable based solely on both being pilot assemblies with thermopiles. The 100112330-style products in this selection list Whirlpool and related models, while the SP21058 products list specific Rheem-family replacement numbers. Match the number printed on the old assembly or specified for the heater, then verify the model and connection details.
For a heater that requires an SP-numbered kit, compare included items as well as fit. One SP21058 listing states line and electrode-wire lengths and names a connection requirement. The other lists its components but does not provide the same length details in the supplied information. Those differences make the heater’s exact requirements important.
Which included components matter?
A basic pilot assembly replacement may not include every small item needed for a particular repair. The two SP21058 listings describe kits with components such as a thermopile, sparker or spark igniter, mounting screws, and an LP orifice; one also lists an orange outdoor flame arrestor with hardware. Confirm the package contents against the repair instructions and the parts being replaced. Do not assume that two kits with the same main part number contain identical accessories.
For the 100112330-style options, the supplied product details focus on the pilot assembly and thermopile rather than a longer accessory list. If you need a particular screw, bracket, connector, or igniter, confirm whether it is included before ordering.
When should you avoid DIY installation?
A water heater pilot assembly is part of a fuel-burning appliance. Shut off the gas supply and follow the heater manufacturer’s instructions before any service. If you smell gas, do not attempt ignition or repair; leave the area and contact the gas utility or emergency services from a safe location. Do not force a connector or modify a gas component to make a mismatched part fit.
Use a qualified technician if you are uncertain about gas type, leak checks, wiring, burner installation, or safe relighting. The product listings do not replace the water heater’s service manual or professional guidance.
Frequently Asked Questions
What does a thermopile do in a gas water heater?
A thermopile generates millivolt electrical output when heated by the pilot flame. That output is used by the water heater’s control system to operate the gas valve. A pilot problem can have causes beyond a failed thermopile, so diagnosis should not rely on symptoms alone.
Can I use a propane pilot assembly on a natural gas heater?
Do not use a propane assembly on a natural gas heater unless the manufacturer specifically identifies that exact part and configuration as suitable. These fuels require the correct appliance components. Follow the heater’s rating plate and parts documentation.
Are 100112330 and SP21058 pilot assemblies interchangeable?
The supplied listings identify them for different replacement-number families and model groups. They should not be treated as interchangeable. Confirm the heater’s full model number and required part number before choosing a kit.
Will a compatible brand name guarantee a fit?
No. A brand may sell multiple water heater designs with different pilot assemblies. Verify the full model number, original part number, connector, gas type, and physical configuration.
What if the pilot will not stay lit after replacing the assembly?
The assembly may not be the only cause. A gas control, wiring connection, venting issue, or another appliance condition may require diagnosis. Follow the service instructions and contact a qualified technician if the cause is uncertain or the pilot still fails.