Mr. Heater 125,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit
Mr. Heater 125,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit
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Mr. Heater

Mr. Heater 125,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit

Mr. Heater 125,000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion KitMr Heater 125 000 BTU Big Maxx Natural Gas Unit Heater with NG to LP Conversion Kit
Size:1"

Key item features

  • Powerful Heating: This 125,000 BTU unit heater effectively warms up to 4,167 square feet, making it suitable for large garages, barns, and workshops.
  • Versatile Fuel: Designed for natural gas, it includes a conversion kit for liquid propane, offering flexible fuel options.
  • Thermostat Ready: Compatible with standard 24-volt or Wi-Fi enabled thermostats (sold separately) for convenient temperature control.
  • Secure Mounting: Comes with two angle brackets for secure ceiling mounting, requiring a minimum 15 ft. ceiling height and 1 in. clearance.
  • Enhanced Safety: Features a high-temperature safety shut-off, gas safety shut-off flame sensor, and an electric spark ignition with a self-diagnostic control module.
  • Efficient Airflow: Utilizes a built-in high-velocity electric fan to circulate warm air efficiently throughout the space.
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Current price is $934.23
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About this item

Product details

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Customer ratings & reviews

4.7 out of 5 stars
stars106 ratings103 reviews
How item rating is calculated
  1. 5 stars86% (91)
  2. 4 stars8% (9)
  3. 3 stars2% (2)
  4. 2 stars0% (0)
  5. 1 star4% (4)

Reviews summary

Pros

  • : Accommodates spaces up to 20 feet high.
  • : Heats spaces up to 3200 sq ft efficiently.
  • : Offers great value for its size and performance.
  • : Comes with well-structured guidance for installation.
  • : Process is simple and easy to follow.
  • : Keeps warm in cold environments.
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Showing 1-3 of 103 reviews

Jan 1, 2026
Al Jr
5 out of 5 stars review

Seller Verified Purchase

Nice Heater

I have had this heater installed and running for a week now. I am very impressed with it so far. Relatively quiet for a heater this size. I purchased the horizontal chimney kit and the thermostat along with the heater and I am pleased with everything.

Review from northerntool.com
Helpful?1NLLJDW1GKCL525051455
Jan 19, 2026
rimfire01
5 out of 5 stars review

Seller Verified Purchase

Light weight , easy install, quiet operation

Very happy with unit I purchased and the customer service. Installation was fairly easy and removing and installing took less than a day. .Unit started right up and was relative quiet in operation.

Review from northerntool.com
Helpful?1NLLJDW1GKCL525051455
Jan 2, 2026
Contender Equipment
5 out of 5 stars review

Seller Verified Purchase

Great affirdable heater

This heater heats my 4000 sf warehouse fast and very economically. Cost is well below comprable brands. Fast delivery was a bonus.

Review from northerntool.com
Helpful?1NLLJDW1GKCL525051455