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Replacing a furnace gas valve is not a purchase where close enough is good enough. The Coleman Source 1 Evcon furnace gas valve reviewed here is intended as a 24V replacement component for compatible Coleman and Evcon heating systems, with the S1-7956-336P replacement family providing the closest verified match to the product details in this listing. Its strengths are OEM-oriented compatibility, Natural/LP capability, and support for older standing-pilot furnaces. The main limitation is equally important: you need to match the furnace model, ignition system, connections, and mounting requirements before ordering.
Quick Verdict
Rating: 8/10
Best For: Owners or HVAC professionals replacing a compatible 24V standing-pilot gas valve in select Coleman or Evcon furnaces.
Bottom Line: This is worth considering when your furnace specifically calls for this replacement family and you need Natural/LP flexibility. It is not a universal furnace valve, and some older installations also require a separate mounting bracket.
Key Specifications
| Specification | Detail |
|---|---|
| Brand family | Source 1 / Coleman / York replacement family |
| Verified replacement model | S1-7956-336P |
| Product type | Furnace gas valve |
| Control voltage | 24V |
| Fuel compatibility | Natural gas or LP when configured correctly |
| Primary application | Compatible standing-pilot Coleman and Evcon gas furnaces |
| Gas inlet | 1/2-inch inlet on the right |
| Outlet | 3/8-inch outlet at the rear |
| Optional/required hardware | S1-7705-5101 valve bracket may be required on certain older 7600 and 7900-series furnaces |
| Installation note | Gas-valve replacement should be matched to the furnace documentation and handled by a qualified HVAC professional when appropriate |
What Is the Coleman Source 1 Evcon Furnace Gas Valve?
The Coleman Source 1 Evcon furnace gas valve is a low-voltage control and gas-regulation component used in compatible gas furnaces. The verified S1-7956-336P replacement is associated with Source 1, York, Coleman, and Evcon equipment and is intended primarily for compatible standing-pilot furnace systems.
The valve operates on a 24V control circuit and can be configured for Natural gas or LP. That makes it useful as a replacement for several older Coleman valve numbers, but the physical layout and appearance may differ from the original component installed in an older furnace.
This distinction matters because furnace parts should be selected by model and replacement-part number, not simply by appearance. An updated OEM replacement can look different while still being the approved replacement, while a similar-looking valve may have the wrong ignition design, port arrangement, or application.
Before You Buy: Do not order this valve only because your old part looks similar or your furnace uses 24V controls. Confirm the furnace model, existing valve number, standing-pilot design, fuel type, connection layout, and bracket requirement first.
Who Should Buy It?
Best For
- Compatible Coleman or Evcon furnaces that call for the S1-7956-336P replacement family.
- Older standing-pilot furnaces that need a 24V Natural/LP convertible replacement valve.
- Repairs where the technician has confirmed the furnace model, ports, fuel configuration, and mounting requirements.
Skip If
- Your furnace uses an electronic-ignition valve that calls for a different replacement part.
- You have not confirmed the furnace model or existing gas-valve part number.
- You expect a universal drop-in part that fits every Coleman, York, or Evcon furnace.
Key Features of the Coleman Source 1 Evcon Furnace Gas Valve
24V Furnace Control
The verified replacement operates from a 24V furnace control circuit. This is a common control voltage in residential heating equipment, but voltage alone does not establish compatibility. The furnace’s ignition type, approved replacement number, gas connections, and mounting arrangement still need to match.
Natural Gas and LP Capability
A useful feature of the S1-7956-336P replacement is its ability to support Natural gas or LP when configured correctly. This gives the replacement more flexibility than a fuel-specific component, especially across older Coleman furnace families.
Fuel conversion is a safety-critical setup issue. You should not assume the valve is already configured for the fuel used by your furnace. Follow the manufacturer’s instructions and have the final setup and gas pressure verified by a qualified HVAC professional.
Standing-Pilot Furnace Application
This replacement family is specifically associated with standing-pilot Coleman furnaces. That is an important buying distinction because another Coleman gas valve may be intended for electronic ignition instead.
Before ordering, identify how your furnace lights the burner. Choosing a valve for the wrong ignition system can turn an apparently simple replacement into the wrong repair.
Inlet and Outlet Layout
The verified S1-7956-336P configuration uses a 1/2-inch gas inlet on the right and a 3/8-inch outlet at the rear. Those connection details give you another way to compare the replacement specification against the furnace documentation.
Do not use connection size alone to decide fit. Correct part-number cross-reference and furnace-model compatibility should come first.
Fit and Compatibility
Compatibility is the most important part of this purchase. Supplier documentation lists the S1-7956-336P for multiple Coleman furnace families and describes it as a replacement for a range of older Coleman gas-valve numbers. It is also listed for select DGRM, DGRT, and DLRS furnace families.
Older equipment can require additional mounting hardware. For certain older Coleman 7600 and 7900-series installations, the S1-7705-5101 valve bracket is listed as a separate required component. That bracket should not be assumed to come with the gas valve.
Pro Tip: Photograph the furnace data plate and the full part number on the existing valve before ordering. Compare those numbers with an official parts diagram or supplier cross-reference instead of relying on product photos.
Installation Requirements for the Coleman Gas Valve
Replacing a furnace gas valve involves both fuel-gas connections and electrical controls, so correct installation matters for combustion and safety. The job is different from replacing a simple thermostat or filter and should not be treated as a trial-and-error repair.
Some older Coleman furnaces require the S1-7705-5101 bracket when this updated valve replaces the original assembly. The updated part may also look different from the valve being removed, which is another reason to follow the furnace’s replacement documentation rather than copying the old physical layout from memory.
Installation Safety
Gas supply, control voltage, leak testing, fuel configuration, and operating pressure all need to be correct before the furnace is returned to service. If you are not trained to work on gas-fired heating equipment, use a qualified HVAC technician.
A failed ignition or no-heat condition also does not automatically prove that the gas valve is defective. Control voltage, gas supply, safety controls, ignition components, and other furnace conditions can produce similar symptoms. Proper diagnosis can prevent replacing a working valve unnecessarily.
How It Performs in Real Use
As a Replacement for an Older Standing-Pilot Valve
This product makes the most sense when an older Coleman or Evcon standing-pilot furnace has been matched to the S1-7956-336P replacement. The updated valve can replace several older part numbers even when its shape does not exactly match the original component.
On Older 7600 and 7900-Series Furnaces
These installations need extra attention because a separate S1-7705-5101 mounting bracket may be required. Buyers who order only the valve without checking the bracket requirement can end up with an incomplete repair.
When Switching Between Natural Gas and LP Applications
The convertible design is useful when the approved furnace application uses either Natural gas or LP. The valve still must be configured correctly for the actual fuel and verified as part of the furnace setup. Convertible does not mean you should change fuels without following the furnace manufacturer’s requirements.
During Long-Term Furnace Maintenance
A properly matched OEM-style replacement can keep an older furnace serviceable when the original gas valve is no longer the current production design. Long-term reliability still depends on correct installation, clean combustion, proper gas pressure, and routine furnace maintenance.
Common Mistakes to Avoid
- Buying by voltage alone: A 24V label does not make two furnace gas valves interchangeable.
- Matching only by appearance: Updated OEM replacements may look different from the original part.
- Ignoring ignition type: Standing-pilot and electronic-ignition systems can use different valves.
- Forgetting the bracket: Certain older Coleman applications require the S1-7705-5101 bracket separately.
- Assuming the valve caused the no-heat problem: The furnace should be diagnosed before parts are replaced.
- Skipping fuel verification: Natural gas and LP configuration must match the furnace and fuel supply.
Pros and Cons
Pros
- 24V replacement design for compatible furnace control systems.
- Supports Natural gas and LP when correctly configured.
- Documented as a replacement for several older Coleman gas-valve part numbers.
- Designed for compatible Coleman and Evcon standing-pilot furnaces.
- Helps keep some older furnace models serviceable with an updated replacement part.
Cons
- Not compatible with every Coleman, Evcon, or York furnace.
- The S1-7705-5101 bracket may need to be purchased separately for some older installations.
- Gas-system installation and adjustment require more care and expertise than a typical DIY replacement part.
What to Look for in Buyer Feedback
Ratings on marketplace listings can change, so they should not carry more weight than compatibility information for a furnace repair part. The most useful buyer feedback is feedback that identifies the furnace model, old valve number, required bracket, and whether the replacement matched the expected standing-pilot configuration.
Comments about easy installation also need context. A valve may physically fit a compatible furnace while still requiring correct fuel setup, pressure verification, and leak testing. For this category, a successful model-specific replacement is more meaningful than a general statement that the part was easy to install.
Is It Worth the Price?
This is a specialized OEM-oriented replacement component rather than a general furnace accessory. Its value comes from solving a specific compatibility problem for older Coleman and Evcon systems that use the applicable standing-pilot valve family.
It can be a strong value when your furnace documentation specifically points to S1-7956-336P or one of its documented predecessor numbers. It is not a good value if you are guessing about the failed component or trying to adapt it to a furnace that calls for another valve.
Also account for the possible S1-7705-5101 bracket and professional installation when comparing the total repair cost. The gas valve itself may be only one part of the job.
How It Compares to Alternatives
The most important alternative is not simply another 24V valve. It is the correct valve specified for your furnace’s ignition system and model. The S1-7956-336P is associated with standing-pilot Coleman applications, while the Coleman/York S1-025-43267-000 replacement family is described for many furnaces using electronic ignition.
That difference makes part-number verification more valuable than comparing cosmetic design or general feature lists. If your furnace uses electronic ignition, a valve specifically listed for that system may be the better match. If your older furnace uses the documented standing-pilot arrangement, the S1-7956-336P family is the more relevant option to investigate.
What About Warranty and Returns?
Warranty and return terms can vary by seller. Some specialty HVAC suppliers advertise a one-year warranty on the S1-7956-336P, but that should not be assumed to apply to every marketplace seller or every listing.
Before ordering, check the current seller’s warranty and return conditions, particularly because gas-valve returns may be affected by installation, opened packaging, or seller-specific policies. Confirming compatibility before purchase is the best way to reduce the risk of an unusable part.
Frequently Asked Questions
Is the Coleman Source 1 gas valve compatible with every Coleman furnace?
No. Compatibility depends on the furnace model, original valve number, ignition system, gas connections, fuel type, and mounting arrangement. Match the furnace documentation or an approved cross-reference before buying.
What replacement part number should I check?
The product details reviewed here most closely match Source 1/York/Coleman part S1-7956-336P. Compare that number and its documented predecessor numbers with the parts information for your exact furnace.
Does the valve work with both Natural gas and propane?
The verified S1-7956-336P replacement is described as convertible for Natural gas and LP applications. It must still be configured correctly for the fuel used by your furnace and checked according to the manufacturer’s requirements.
Do I need the S1-7705-5101 mounting bracket?
Possibly. The bracket is separately listed for certain older Coleman 7600 and 7900-series installations using the updated valve. Check your furnace model and replacement instructions before ordering the valve by itself.
Can a replacement valve look different from the original?
Yes. Updated Coleman replacement valves can have a different physical appearance from older parts they replace. Use the furnace model and official replacement numbers rather than appearance as your main compatibility check.
Does a no-heat furnace automatically mean the gas valve is bad?
No. Gas supply, control voltage, safety controls, ignition components, and other faults can cause similar symptoms. Proper diagnosis should come before replacing the valve.
Is this the same valve used on electronic-ignition furnaces?
Not necessarily. The S1-7956-336P family is described for standing-pilot applications. Coleman also has different replacement valve families for furnaces using electronic ignition, so identify your ignition system before ordering.
Should I install a furnace gas valve myself?
Gas-valve work involves fuel connections, electrical controls, leak testing, and correct operating setup. If you are not trained and equipped for gas-fired HVAC service, have a qualified technician diagnose and install the replacement.
The Bottom Line
The Coleman Source 1 Evcon gas valve is worth considering when you have a compatible standing-pilot furnace and your model or original part number cross-references to the S1-7956-336P replacement family. Its 24V design and Natural/LP capability are useful strengths, but compatibility is limited and some older furnaces need the separate S1-7705-5101 bracket.
If you have confirmed the exact furnace application, it is a practical OEM-oriented replacement. If you are unsure about the ignition system, failed component, fuel setup, or part number, verify those details with an HVAC professional before ordering.
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