8 Best Gas Fireplace Thermocouple Replacement (November 2026)

The best gas fireplace thermocouple replacements include the Criditpid 4021-737 Pilot Assembly LP for Heatilator for listed Heatilator LP models, the SURIEEN Natural Gas and LP Pilot Burner for HPC-102-36 replacement, and the Viefow 120630-02 Pilot ODS Assembly Replacement Vent for DESA vent-free LP heaters.

On this page (6 sections)

1. Which gas fireplace thermocouple replacement fits your fireplace?
2. How we chose these gas fireplace thermocouple replacements
3. What should you check before choosing a replacement thermocouple?
4. What connection and length details should you compare?
5. How can you replace a gas fireplace thermocouple safely?
6. Which replacement should you choose?

The best gas fireplace thermocouple replacement is the part that matches your model, fuel and original connections. For named Heatilator LP models, Criditpid's 4021-737 pilot assembly is the top pick; other choices target HPC-102-36, 120630-02 and 10002264 systems.

Many items called thermocouple replacements are complete pilot assemblies. For complete replacement options, see gas fireplace pilot assemblies.

Those kits can include a thermocouple, thermopile, pilot tubing, ignitor wire or bracket, so identify the failed component before buying.

If you're comparing broader repair parts, our best gas fireplace replacement parts guide covers related components. For other hearth hardware, see the complete guide to stove and fireplace parts, including fireplace blower motors.

Our picks at a glance

1. 1
   Best for listed Heatilator LP models

   Criditpid 4021-737 Pilot Assembly LP for Heatilator

   9.5/10 our score

   See it on Amazon
2. 2
   Best for HPC-102-36 replacement

   SURIEEN Natural Gas and LP Pilot Burner

   9.4/10 our score

   See it on Amazon
3. 3
   Best for DESA vent-free LP heaters

   Viefow 120630-02 Pilot ODS Assembly Replacement Vent

   9.3/10 our score

   See it on Amazon

4. 4

   Hiorucet 10002264 Natural Gas 3 Way Pilot

   Best for 10002264 natural gas models
   Check it
5. 5

   palart 10002264 Pilot Assembly NG/LPG Fireplace Replacement

   Best for listed NG or LPG models
   Check it
6. 6

   palart 24" 750mv Thermopile for Heat Glo

   Best for a 24-inch thermopile match
   Check it
7. 7

   Criditpid 10002265 Propane Gas

   Best for 10002265 LP pilot assemblies
   Check it
8. 8

   Irnyso Replacement combustor Heaters Propane Gas Wall

   Best for 120630-02 LP replacements
   Check it

Which gas fireplace thermocouple replacement fits your fireplace?

The right gas fireplace thermocouple replacement matches the appliance's part number, fuel and connection layout. These 8 picks include both standalone thermopiles and complete pilot assemblies, so use the exact type your fireplace needs.

1

Criditpid 4021-737 Pilot Assembly LP for Heatilator: Best for listed Heatilator LP models

9.5/10Our score

• Propane gas only
• 4021-737 replacement part
• Includes thermocouple and thermopile
• Listed Heatilator, Heat-N-Glo and Quadra-Fire model compatibility

This complete pilot assembly is a close match when your manual calls for 4021-737 and your fireplace is one of the listed LP models. Confirm the model and serial range before ordering.

See it on Amazon

Pros

• Long compatibility list for named fireplace models
• Includes thermocouple and thermopile

Cons

• Propane only
• Model and serial details need careful checking

2

SURIEEN Natural Gas and LP Pilot Burner: Best for HPC-102-36 replacement

9.4/10Our score

• Natural gas and LP pilot burner assembly
• Compatible with Rebertshaw HPC-102-36
• 36-inch leads
• Includes thermocouple, pilot light holder and burner gasket

The HPC-102-36 match and stated 36-inch leads make this a focused option when those details match your original assembly. Its instructions warn against sharply bending the thermopile line.

See it on Amazon

Pros

• Names a specific compatible assembly
• Includes a burner gasket

Cons

• Confirm the original part number and lead routing

3

Viefow 120630-02 Pilot ODS Assembly Replacement Vent: Best for DESA vent-free LP heaters

9.3/10Our score

• 120630-02 ODS pilot assembly
• Propane gas
• Compatible with 120790-01 dual-wire thermocouple
• 33-inch thermocouple

This ODS assembly is aimed at unvented LP wall heaters, gas log sets and indoor fireplaces that use 120630-02. Match both the assembly number and thermocouple connection to your unit.

See it on Amazon

Pros

• Names a matching dual-wire thermocouple
• Lists DESA and several related heater brands

Cons

• For propane equipment
• Designed for vent-free appliances

4

Hiorucet 10002264 Natural Gas 3 Way Pilot: Best for 10002264 natural gas models

9.1/10Our score

• Natural gas only
• 10002264 and SRV10002264 part numbers
• Includes thermocouple and thermopile
• Fits listed Majestic, Monessen, Temco and Vermont Castings models

This complete 3-way pilot assembly fits buyers whose original part number and listed fireplace model match 10002264. It includes both pilot and main valve sensors.

See it on Amazon

Pros

• Includes the bracket and pilot tubing
• Broad named model compatibility

Cons

• Natural gas only
• Not a standalone thermocouple

5

palart 10002264 Pilot Assembly NG/LPG Fireplace Replacement: Best for listed NG or LPG models

9.0/10Our score

• 10002264 replacement number
• Natural gas nozzle installed
• LPG nozzle included
• Lists 750 mV thermopile

The included LPG nozzle adds flexibility for a compatible 10002264 assembly, but fuel conversion must follow the appliance maker's instructions. Check your exact fireplace model and pilot setup.

See it on Amazon

Pros

• Lists both NG and LPG nozzle options
• Broad named model compatibility

Cons

• Natural gas nozzle is installed initially
• Confirm the assembly suits your appliance before changing fuel setup

6

palart 24" 750mv Thermopile for Heat Glo: Best for a 24-inch thermopile match

8.8/10Our score

• 24-inch thermopile
• 750 mV stated output
• For propane gas appliances with a pilot burner
• Aluminium glass fiber cover

Unlike the complete pilot kits, this is a thermopile replacement. Check that your fireplace calls for a 24-inch propane thermopile and verify the connection and routing against the original.

See it on Amazon

Pros

• Standalone thermopile format
• States length and output

Cons

• Propane focused
• Thermopile is not the same part as a thermocouple

7

Criditpid 10002265 Propane Gas: Best for 10002265 LP pilot assemblies

8.4/10Our score

• Propane gas orifice installed
• 10002265 replacement number
• Includes thermocouple and thermopile
• Natural gas nozzle included

This complete 3-way pilot assembly suits a listed model that calls for 10002265. It includes both sensors and a natural gas nozzle, so confirm the required fuel setup before installation.

See it on Amazon

Pros

• Includes the bracket and both sensors
• Lists Majestic, Monessen, Temco and Vermont Castings compatibility

Cons

• Propane orifice is installed initially
• Check model and fuel requirements

8

Irnyso Replacement combustor Heaters Propane Gas Wall: Best for 120630-02 LP replacements

8.1/10Our score

• 120630-02 replacement number
• Propane gas equipment
• Lists Vanguard, Comfort Flame, Glo-Warm, Cozy Heat, Kozy World, Pro Com and DESA

This LP pilot assembly lists the same 120630-02 family used by some vent-free heaters and gas fireplaces. Check the full replacement number and connections against your appliance before choosing it.

See it on Amazon

Pros

• Lists several compatible heater brands
• Names multiple replacement part numbers

Cons

• Propane equipment only
• Professional installation guidance is advised

How we chose these gas fireplace thermocouple replacements

We compared the stated part numbers, fuel compatibility, included components and named appliance models against the needs of someone replacing a pilot safety sensor. Our score weighs those details against how clearly each option identifies its fit.

A long compatibility list can help, but it does not guarantee a match for every unit in a model family. Check the appliance rating plate and manual, especially where serial ranges or fuel variants matter.

What should you check before choosing a replacement thermocouple?

Check the model and part number first, then confirm fuel type and whether the replacement is a sensor or a full pilot assembly. These details help prevent buying a similar-looking part that will not connect to your fireplace.

Does your fireplace need a thermocouple or a thermopile?

A thermocouple and a thermopile have different roles, even though both can appear in the same pilot assembly. Compare the original part and manual, or use our gas fireplace thermocouple vs thermopile guide to identify which sensor you need.

A complete kit such as 4021-737 or 10002264 includes both types. If the manual calls for only a thermopile, see our guide to the best gas fireplace thermopile replacement.

Is the replacement for natural gas or propane?

Fuel matters because several assemblies here are fuel specific. Criditpid 4021-737 and 10002265 are configured for propane, while Hiorucet 10002264 is for natural gas.

Some options include a second nozzle, but that does not mean every fireplace can use either fuel. Follow the fireplace manufacturer's conversion instructions and verify the required setup before installation.

Does the part number match your fireplace model?

A part number is a useful starting point, not a substitute for model and serial checks. The Criditpid 4021-737, for example, lists specific Heatilator, Heat-N-Glo and Quadra-Fire models, and some compatibility details depend on serial ranges.

Write down the full model and serial number from the appliance label. Compare those with the replacement's stated compatibility, then ask a qualified service technician if the match is unclear.

Is it a sensor or a complete pilot assembly?

A standalone sensor replaces just the thermocouple or thermopile. A complete assembly may also include the pilot burner, tubing, ignitor wire and bracket, which can be needed when the pilot parts themselves are damaged.

The palart 24-inch 750 mV option is a thermopile, while several other picks are complete pilot assemblies. For an older fireplace where a larger change may make more sense, consider our best gas fireplace insert for old fireplaces.

What connection and length details should you compare?

Compare lead length, wire arrangement, tubing path and connector style with the original part. Similar part names can still have different connections, so don't rely on appearance alone.

For example, SURIEEN specifies 36-inch leads for HPC-102-36, while Viefow's 120630-02 assembly matches a 33-inch dual-wire thermocouple. Avoid sharp bends in delicate tubing or sensor leads, and keep the original routing as a reference.

How can you replace a gas fireplace thermocouple safely?

Use the appliance manual and a qualified technician when a repair involves gas connections or you're unsure how to test the completed work. Shut off the gas supply before service and follow the exact instructions for your fireplace.

After any gas-related replacement, the appliance must be checked for leaks before it is used. Do not operate the fireplace if you smell gas or suspect a leak; leave the area and contact your gas supplier or emergency services according to local guidance.

Which replacement should you choose?

Choose Criditpid 4021-737 if your Heatilator, Heat-N-Glo or Quadra-Fire LP model and part number match. Pick Hiorucet 10002264 or Criditpid 10002265 only when the original part and fuel setup match those assemblies, and choose a standalone thermopile when that is the component your manual specifies.

For propane-specific options, compare the best thermocouple for propane fireplace guide. The safest choice is the exact compatible part, verified against your fireplace model and service instructions.

Our top 3 picks at a glance

1. 1
   Best for listed Heatilator LP models

   Criditpid 4021-737 Pilot Assembly LP for Heatilator

   9.5/10 our score

   See it on Amazon
2. 2
   Best for HPC-102-36 replacement

   SURIEEN Natural Gas and LP Pilot Burner

   9.4/10 our score

   See it on Amazon
3. 3
   Best for DESA vent-free LP heaters

   Viefow 120630-02 Pilot ODS Assembly Replacement Vent

   9.3/10 our score

   See it on Amazon

Frequently asked questions

How do I find the right gas fireplace thermocouple replacement?

Match the part number, fireplace model, fuel type and connection style to your manual or original component. A complete pilot assembly may include a thermocouple and thermopile, so confirm whether you need one sensor or the full assembly.

If model or serial ranges are listed, compare those too.

Are a thermocouple and thermopile the same part?

No. They are different sensors used in gas appliances, and some pilot assemblies contain both.

Check which component your fireplace requires before ordering.

Our guide to gas fireplace thermocouple vs thermopile explains their different roles.

Can I use a natural gas pilot assembly on propane?

Only when the assembly is approved for the appliance's fuel setup and the conversion follows the fireplace maker's instructions. Some assemblies are fuel specific, while others include a different nozzle.

Never assume a nozzle swap alone makes an assembly suitable for your fireplace.

Can I replace the thermocouple myself?

Gas fireplace service can involve gas connections and fragile pilot tubing. Follow the appliance manual and use a qualified technician if you are unsure how to isolate the gas supply, identify the part or check for leaks.

For a gas stove, see How to Replace a Thermocouple in Your Gas Stove, but use your fireplace manual for fireplace repairs.