The right gas heater conversion kit depends on the heater’s make, model, fuel direction, and BTU rating. For Modine Hot Dawg unit heaters, consider the 30,000–75,000 BTU NG-to-LP kit; for compatible Mr. Heater Big Maxx and Heatstar models, compare the F260163 options below. The Frigidaire GRLP4 kit is for ranges and cooktops, not heaters, so it is included only to clarify that appliance-specific kits are not interchangeable.
| Product | Best suited for | Fuel direction |
|---|---|---|
| Modine Hot Dawg conversion kit | Specified 30,000–75,000 BTU unit heaters | Natural gas to propane |
| Mr. Heater F260163 | Listed Big Maxx and Heatstar models | Natural gas to propane |
| F260163-compatible parts kit | Listed 50,000 and 80,000 BTU Big Maxx models | Natural gas to propane |
| GRLP4 conversion kit | Compatible Frigidaire-family ranges and cooktops | Natural gas to propane |
Modine Hot Dawg 30,000–75,000 BTU Kit
This kit is designed to convert compatible gas-fired unit heaters from natural gas (NG) to liquid propane (LP). Its listed range is 30,000 to 75,000 BTU, making it a relevant option for buyers with a matching Modine Hot Dawg heater.
Best for: Owners of a compatible Modine Hot Dawg or other specified unit heater in the stated BTU range who need an NG-to-LP conversion. It was selected because its listing identifies both the conversion direction and heater capacity range.
Check before buying: The product information does not provide a full model-number list. Confirm the exact heater model and ignition configuration against the heater documentation or manufacturer before ordering. Do not assume that every 30,000–75,000 BTU heater uses this kit.
Mr. Heater F260163 Fuel Conversion Kit
The Mr. Heater F260163 converts specified Big Maxx or Heatstar unit heaters from natural gas to liquid propane. Listed compatible models include MHU50, MHU80, MH125U, HSU50, HSU80, and HS125U, with 50,000, 80,000, and 125,000 BTU models identified in the product details.
Best for: Buyers whose heater model appears in the listed compatibility information and who want a kit with conversion instructions. It was selected for its explicit model references and broader stated BTU coverage than the 50,000- and 80,000-BTU-only alternative below.
Limitation: This is not a universal heater conversion kit. Check the complete model number and fuel-conversion direction before purchase; the listing describes NG-to-LP conversion, not LP-to-NG conversion.
F260163-Compatible Big Maxx Parts Kit
This F260163-compatible kit is described for converting natural gas to propane on Mr. Heater Big Maxx models MHU50, HSU50, MHU80, and HSU80. The listing says the package includes conversion components, hardware, and rating stickers.
Best for: Big Maxx owners with one of the listed 50,000- or 80,000-BTU models who want a package described as containing the necessary conversion parts. It was selected as a narrower alternative to the Mr. Heater-branded F260163 listing.
Compare carefully: The listed compatibility does not include the 125,000 BTU models named for the other F260163 product. The information identifies the kit as compatible with Mr. Heater parts but does not establish that it is an original manufacturer kit. Verify the exact heater model and requirements before ordering.
GRLP4 Kit For Compatible Gas Ranges
This 12-piece GRLP4 kit converts compatible natural-gas ranges, stoves, and cooktops to propane. The listing describes brass orifices and compatibility with many Frigidaire, Kenmore, and Electrolux sealed-burner models. It also names replacement part numbers AP5608114, 318565427, 2319698, and 5304498798.
Best for: A buyer researching gas appliance conversion who has a compatible range or cooktop—not a space heater or unit heater. It is included to distinguish appliance-specific conversion parts from heater kits.
Important limitation: This product is not a gas heater conversion kit. Its stated purpose is range and cooktop conversion, so do not use it on a heater. Confirm the appliance model and part number before ordering.
Buying Guide: How To Choose A Gas Heater Conversion Kit
Does the kit match the heater model?
Start with the heater’s complete model number, not just the brand or general product family. Conversion parts are commonly designed for specific equipment. A kit labeled for a Big Maxx model should not be assumed to fit a different garage heater, even if both appliances have similar BTU ratings.
Use the heater’s data plate and installation or service documentation to identify its model and current fuel type. Compare that information with the kit’s stated compatibility. If the model is not listed, contact the heater manufacturer or a qualified service professional rather than guessing.
Is the fuel direction correct?
Check whether the kit converts natural gas to propane or propane to natural gas. These are different conversions and cannot be treated as interchangeable. The heater kits listed here describe NG-to-LP conversion. The GRLP4 range kit also describes NG-to-LP conversion, but it is for compatible cooking appliances, not heaters.
Does the BTU range line up?
BTU capacity can help narrow options, but it does not confirm compatibility by itself. The Modine kit is listed for 30,000–75,000 BTU unit heaters. The Mr. Heater-branded F260163 listing identifies models reaching 125,000 BTU, while the alternative F260163-compatible parts kit lists specific 50,000- and 80,000-BTU Big Maxx models.
Match both the heater model and capacity to the product details. If the model list and BTU information do not agree with your heater documentation, do not order based on capacity alone.
What should be included?
Read the included-parts description closely. The F260163-compatible listing says it includes components, hardware, and rating stickers. The Mr. Heater F260163 listing mentions complete conversion instructions. The Modine kit description states the supported heater range and fuel direction but does not provide a detailed inventory in the supplied information.
Do not assume that tools, hoses, regulators, or other parts are included unless the product information specifically says so. A kit for a range or grill may contain components that are unsuitable for a heater.
Should you install a conversion kit yourself?
Gas-fuel conversion involves changing how an appliance operates and must follow the heater manufacturer’s requirements and local rules. Consult the product instructions and heater documentation before proceeding. If you are not qualified to perform the work, use a qualified gas-appliance professional. Do not operate the heater if the conversion, labeling, or fuel supply is uncertain.
How can you avoid buying the wrong appliance kit?
Check the appliance category in the product description. A range kit uses parts intended for compatible burners in cooking appliances. A grill conversion kit is designed for a grill, and a unit-heater kit is designed for specified heaters. Similar terms such as “gas conversion” do not mean that parts can be shared across appliance types.
Frequently Asked Questions
Can one gas heater conversion kit fit any heater?
No. Conversion kits are appliance- and model-specific. Confirm the heater model, fuel direction, and any stated BTU or configuration limits before selecting a kit.
Can I use the GRLP4 kit on a gas heater?
No. The GRLP4 kit is described for compatible Frigidaire-family ranges, stoves, and cooktops. It is not identified as a heater conversion kit.
What does NG to LP mean?
NG to LP means converting an appliance set up for natural gas to operate on liquid propane. It does not mean the kit can convert propane to natural gas.
Which listed kit covers 125,000 BTU models?
The Mr. Heater F260163 listing identifies MH125U and HS125U among compatible models and names 125,000 BTU models. Confirm your exact heater model before purchase.
Is BTU rating enough to determine kit compatibility?
No. BTU rating is only one check. Verify the model number, fuel type, conversion direction, and product-specific compatibility information as well.