Free Shipping and No Hassle Returns
Free Shipping
We offer free shipping on orders over $199.*
No Hassle Returns
Don’t like it? Send it back. It’s that simple.*
Same Day Shipping
Most orders ship same day if placed by 5PM EST (M-F)
*Restrictions Apply. See Details »
Model#: MRHNF260550

What are the different product conditions?

Brand new items;Full manufacturer warranty available
Manufacturer inspected, repaired and tested items; CPO 60 day money back guarantee
Open Box
New or Recon items with possible minor cosmetic damage; CPO 60 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

Mr. Heater MHU50 Big Maxx 50,000 BTU Natural Gas Unit Heater

  • Mr. Heater MHU50 Big Maxx 50,000 BTU Natural Gas Unit Heater
Free Shipping
(continental U.S.)
This item is no longer available.
Give us a call, we're here to help.
Add to Cart


Mr. Heater's MHU50 Big Maxx 50,000 BTU Natural Gas Unit Heater is great for turning your garage or barn into a comfortable heated work space. Mr. Heater Unit Heaters use a built-in electric high-velocity fan to pull cool air into the rear of the heater and over a heat exchanger, forcing hot air into the surrounding area. Proper ventilation kit is required and is sold separately.
  • Can warm up to 700 sq-ft. of space at a rate of 50,000 BTU per hour
  • Spark ignition features self-diagnostic control module
  • Natural Gas to Liquid Propane conversion kit included
  • Includes two angle brackets for ceiling mount
  • Big Maxx 50,000 BTU Natural Gas Unit Heater - F260550
  • Natural Gas to Liquid Propane Conversion Kit
  • (2) Ceiling Mount Brackets


Length: 25 in.
Width: 20.5 in.
Height: 13 in.
BTU Per Hour: 50000
Fuel Type: Natural Gas
Heat Range: 1,250 sq-ft.
Heater Type: Forced Air



5.0 / 5.0
1 Review
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend?
Yes (1)
Easy To Use (1)
Yes, I would recommend this to a friend
Easy To Use
Easy to install
Heating garage, Very light weight, only cant change bracket location from front and rear to sides
May 10, 2015

Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 3 questions Browse 3 questions and 3 answers
What size of vent pipe is on this unit? What is top clearance minimum? As this would be a ceiling mount under a finished drywall ceiling?
double D on Nov 11, 2015
BEST ANSWER: For installation instructions, please use the link below and refer to page E-4:
I would like to put this unit {MHU50 Gig Maxx 50,000BTU Natural Gas Unit Heater} in my greenhouse 580 sq ft, I would like to fasten it to concrete blocks one high on the floor under a shelf at the back wall, instructions for the heater indicates 8' minimum height for installation , ? my ceiling joist are at 7.9',and rafters are to close together to install above, what is the safety factor in installing with the concrete blocks?
BEST ANSWER: Please contact Mr Heater directly at 800-251-0001 for technical assistance for that heater.
Do you ship to Anchorage Alaska? If you do how much to ship? Thanks in advance, if you could respond soon, I will buy right away. Al
Al on Oct 27, 2014
BEST ANSWER: CPO will need your zipcode before they can quote you the shipping cost


Mr. Heater Limited Warranty

The company warrants most products to be free from defect for one year from date of purchase. At its option, the company will repair or replace products returned by the buyer to the factory free of charge, if it has been proven to be defective within the 1-year period. If a product has to be returned, it will be at the customers expense, with proof of purchase, to Mr. Heater.