Mr. Heater Big Maxx Natural Gas Heater with Propane Conversion Kit, 125,000 BTU, 5,000 sq. ft.
Item # 233750499
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Item # 233750499
Valid 5/15/2026 - 7/5/2026Apply now
This item is available online only
Delivery to
37027
For delivery, this item requires a Big & Bulky handling fee.
Neighbor’s Club Members earn points with purchases.
The Mr. Heater Big Maxx 125,000 BTU unit heater will turn your garage or barn into a work space you can use all year round. Uses a built-in high-velocity electric fan to pull cool air in and across the heat exchanger, then forcing warm, comfortable air out. Its low profile design requires only a 15 ft. minimum ceiling height and 1 in. mounting clearance. Features a high-temperature safety shut-off, gas safety shut-off flame sensor, and an electric spark ignition with a self-diagnostic control module, to bring you peace of mind and years of comfortable, safe heat. Comes as natural gas and includes a propane conversion kit and ceiling mounting brackets. Requires 120-Volt AC power and can be vented vertically or horizontally - please check local codes and restrictions. This heater offers all the operating versatility and safety you have come to expect from Mr. Heater.
For additional information on this product, please see the Product Documents section for all downloadable user manuals, installation guides, brochures and warranty statements.
- Ceiling mounted forced air propane unit heater turns garages, barns and workshops into heated work spaces
- 125,000 BTUs heat up to 5,000 sq.ft.
- Compatible with standard 24-volt or new Wi-Fi enabled thermostats (sold separately)
- Low profile design minimum 10 ft. ceiling height and 8 ft. clearance required from the base of heater to floor
- High temperature safety shut-off switch and gas safety shut-off flame sensor
- Electric spark ignition with self-diagnostic control module - 120-Volt AC power required
- Includes ceiling mounting brackets and a natural gas to propane conversion kit
- Aluminized steel tubular heat exchanger for maximum efficiency and longer life
- 4 in. flue size; Category 1 vertical or Category 3 horizontal venting required (sold separately)
| Brand | Mr. Heater |
|---|---|
| Country of Origin | Imported |
| Compatibility | N/A |
| Heating Replacement Part Type | Other |
| Package Quantity | 1 |
| Primary Color | Black |
| Primary Material | Metal |
| Product Height | 30.25 in. |
| Product Length | 29.5 in. |
| Product Weight | 122 lb. |
| Product Width | 32 in. |
| Warranty | 3 Year Limited on Heater Parts; 10 Years Limited on Heat Exchanger |
| Manufacturer Part Number | F260590 |
Q: Manual for this shows a 35 hr run time, is that off of a 100 lb tank?
2 years ago- A: Thank you for your inquiry. No, that is based on a 200 lb tank. A 100 lb tank will have about half that runtime. Have a great day!2 years agoHelpful?
Q: Can this be ran off of a propane cylinder, 50 lb size?
2 years ago- A: Thank you for your inquiry. Yes, you can run this unit off a tank that size. Have a great day!2 years agoHelpful?
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