Choosing the right replacement thermocouple or safety assembly is essential for reliable operation of patio heaters, tank-top heaters, and residential gas appliances. Below is a quick comparison of five well-matched replacement thermocouples and safety kits available on Amazon, followed by detailed product summaries and a practical buying guide.
| Product | Application | Key Feature |
|---|---|---|
| Resideo CQ100A1013/U 24-Inch | Gas Furnaces, Boilers, Water Heaters (30 mV) | 24″ length with adapter fittings |
| Resideo CQ100A1005 36-Inch | Gas Furnaces, Boilers, Water Heaters (30 mV) | 36″ length with adapter fittings |
| Mr. Heater F237349 Thermocouple Assembly | Mr. Heater Patio & Propane Heaters | Includes tip-over switch compatibility |
| US Merchant Mr Heater Replacement 12-1/2″ | Mr. Heater Tank Top Models | 12-1/2″ length; replaces F273117 |
| Thermocouple F273117 (LESYAO) | Propane Tank Top Heaters & More | M8*1 tip thread, 24″ total length, wide compatibility |
Content Navigation
- Resideo CQ100A1013/U 24-Inch Replacement Thermocouple
- Resideo CQ100A1005 36-Inch Replacement Thermocouple
- Mr. Heater F237349 Thermocouple Assembly With Tip Over Switch
- US Merchant Mr Heater Replacement Thermocouple 12-1/2″
- Thermocouple F273117 For Propane Tank Top Heaters (LESYAO)
- Buying Guide: Choosing The Right Thermocouple Or Replacement Assembly
- 1. Match The System Voltage And Type
- 2. Length And Routing Requirements
- 3. Thread Size And Fittings
- 4. Integrated Safety Features
- 5. OEM Part Numbers And Cross-References
- 6. Application Environment
- 7. Installation And Compatibility Notes
- 8. Safety And Inspection
- 9. Multiple Comparison Perspectives
- 10. Practical Verification Steps
Resideo CQ100A1013/U 24-Inch Replacement Thermocouple
The Resideo CQ100A1013/U 24-Inch is designed for 30 millivolt gas control systems commonly found in furnaces, boilers, and water heaters. Its 24-inch length is suitable for many installations where the pilot assembly sits a short distance from the gas valve.
- Compatibility: Intended for 30 mV control systems and most residential gas appliances specified by the manufacturer.
- Adapter Fittings: Includes adapter fittings for ease of installation and to match common valve connections.
- Application Notes: Fits systems where a 24″ thermocouple length is recommended; verify terminal and fitting sizes when replacing factory parts.
This unit focuses on basic thermocouple flame sensing for sustained pilot operation. It is a direct replacement option when OEM part numbers or comparable lengths are required.
Resideo CQ100A1005 36-Inch Replacement Thermocouple
The Resideo CQ100A1005 36-Inch thermocouple provides a longer lead for installations where the pilot assembly is farther from the gas control valve. It is intended for the same 30 millivolt systems as the 24-inch version.
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- Longer Reach: 36-inch length allows routing around panels or through access openings without strain.
- Includes Fittings: Adapter fittings help match terminal and valve interfaces during replacement.
- Application: Common in water heaters or boilers where space constraints require more tubing length.
Longer thermocouples help prevent pulling or bending at connection points. Confirm clearance and proper routing to avoid heat or abrasion damage during reinstallation.
Mr. Heater F237349 Thermocouple Assembly With Tip Over Switch
The Mr. Heater F237349 assembly is tailored to specific Mr. Heater and SunRite portable patio heater models. It combines a thermocouple with a tip-over switch for an integrated safety function.
- Model Fit: Fits Mr. Heater MH15T, MH15TS, MH30T, MH30TS, MH45T and SunRite SRC models listed by the manufacturer.
- Safety Integration: Works with the heater’s automatic shut-off system if the unit tips or the pilot is extinguished.
- OEM Replacement: Designed to replace part #17349, matching form and function for direct swap installations.
Use this assembly when replacing an integrated safety and sensing unit on compatible outdoor propane stand-up heaters. Proper model matching is important for correct operation of the tip-over safety feature.
US Merchant Mr Heater Replacement Thermocouple 12-1/2″
The US Merchant 12-1/2″ replacement thermocouple replaces Mr. Heater part number F273117 for certain tank-top heater models. Its shorter length is intended for compact configurations.
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- Replacement Part: Specifically listed as replacing Mr Heater F273117 for tank-top models.
- Length: 12-1/2″ length fits models where shorter lead routing is required.
- Compatibility Note: For use with corresponding safety valves (example: f273116) as specified by the vendor.
This component suits users restoring OEM-type operation for small tank-top heaters. Verify the required length and valve compatibility prior to purchase to ensure functional replacement.
Thermocouple F273117 For Propane Tank Top Heaters (LESYAO)
The LESYAO Thermocouple F273117 advertises broad compatibility with Mr. Heater tank top models and other portable gas appliances. It lists thread size and length to simplify fit checks.
- Versatile Use: Compatible with Mr. Heater MH12C, MH12T, MH24T, MH42T and other appliances like grills and fireplaces.
- Thread And Length: M8*1 tip thread with two nuts for secure installation and a 24″ total length in this listing.
- Replaces Multiple Parts: Intended as a drop-in replacement for several F273xxx series parts where thread and length match.
When replacing tank-top thermocouples, thread pitch and nut arrangement are critical. This product specifies those dimensions to help confirm fit for DIY or professional service.
Buying Guide: Choosing The Right Thermocouple Or Replacement Assembly
Selecting the correct thermocouple or replacement safety assembly requires attention to several technical and application-specific details. Below are key considerations to compare products effectively.
1. Match The System Voltage And Type
Confirm whether the appliance uses a 30 millivolt thermocouple system or a different control type. Most residential pilot-operated gas controls use 30 mV thermocouples. Using a mismatched type can prevent the gas valve from functioning properly.
2. Length And Routing Requirements
Thermocouple lead length must be sufficient to reach from the pilot tip to the gas valve without tension or sharp bends. Common lengths include 12-1/2″, 24″, and 36″. Measure the required routing path before ordering.
3. Thread Size And Fittings
Check the thread pitch and nut arrangement—examples include M8*1 and common 1/8″ NPT adapters. Some replacement parts include adapter fittings, which ease installation when OEM fittings differ.
4. Integrated Safety Features
Outdoor heaters often use combined assemblies with tip-over switches or flame-out shutoffs. If the original part included a tip-over switch, replace it with an assembly that mirrors that safety function to maintain compliance and safety.
5. OEM Part Numbers And Cross-References
Where possible, match OEM part numbers or documented replacements (e.g., F273117, F237349). Cross-references help ensure the physical design and electrical characteristics align with the original component.
6. Application Environment
Consider exposure to outdoor conditions for patio heaters. Look for corrosion-resistant materials and assemblies rated for outdoor use if replacing components on propane patio heaters.
7. Installation And Compatibility Notes
Verify whether the product includes adapter fittings or requires crimping/soldering. Some thermocouples are part of a pilot assembly with tubing; others are standalone rods. Confirm what is included to avoid missing parts during replacement.
8. Safety And Inspection
After installation, perform typical safety checks: ensure the pilot lights reliably, the gas valve remains open with a steady pilot flame, and any tip-over or flame sensors actuate correctly. If uncertain, consult a qualified technician.
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9. Multiple Comparison Perspectives
- Length vs. Routing Complexity: Choose longer lengths to allow gentle routing; shorter lengths can be used only where space is constrained.
- Integrated Safety vs. Standalone Sensor: Integrated assemblies are simpler to swap for OEM-like replacements; standalone thermocouples may be more flexible for non-standard setups.
- OEM Fit vs. Universal Fit: OEM-matched parts typically ensure direct compatibility; universal parts require careful matching of threads and electrical characteristics.
10. Practical Verification Steps
- Measure existing thermocouple length and thread pitch before ordering.
- Record the appliance model number and original part number when available.
- Confirm that included adapters or nuts match the valve terminals on your unit.
- Perform a function test after installation to verify reliable flame sensing and safety operation.