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The MHU45NG is a propane fired, forced air convection heater. This unit is ideal when ceiling heights do not allow for infrared heaters to be used. It easily installs from the ceiling with included angle brackets. Unit has power exhaust which allows for both vertical or horizontal venting. Unit is thermostatically controlled and includes a spark ignition system with self diagnostic control module. This CSA certified heater will heat up to 700 square feet and comes with a three year limited warranty on the parts and the burner and a ten year warranty on the heat exchanger.

User Reviews about Mr. Heater Big Maxx 45 - 000 BTU Natural Gas Garage Unit Heater #MHU45NG

I installed this myself in a new 900 sq ft detached garage workshop. Installation was straightforward and it works as advertised. More quiet and vibration free than I expected and has operated for a month so far without any problems.

45000 btu model is well matched to this size building (note that the building is well insulated R19 walls and R30 ceiling and tightly constructed). No problems maintaining 60F above outdoor temp even with strong winds.

You'll need two fairly strong installers or some clever lifting devices to mount it to the ceiling since the unit is about 65 lbs. It's built just like an 80% eff home furnace only smaller.
-- Works well - a solid product

We were looking for a solution for heating a 700 sq. ft. guest space with high ceilings. It's an architectural house, as they say, which means you can do odd things (like putting a garage heater into a living space) and everyone accepts it as part of the master design.

Prior to Mr. Heater, we tried two other heating solutions for the space. One was a glass-front heater that looked like a wood burning stove, and the other was a gas baseboard heater. The first one worked well. It heated the space in about twenty minutes. The problem was that it took up too much floor space. The baseboard heater was a bust; our portable heaters did a better job.

Mr. Heater is, as it says in the summary above, fantastic. It can heat the room by 11-degrees in about five minutes. It's not nearly as quiet as our first heater but, oddly, it's much quieter than our failed baseboard heater. Whatever noise it makes isn't annoying, unlike the baseboard heater that generated an odd pitch and vibration.

Given how fast Mr. Heater heats the space, we have no need to preheat the room and we can run it for short stretches.

Point of reference: We live in Los Angeles, so 50-degrees is freezing on our scale.

p.s. We called the factory before buying the unit. The reps were quite helpful. -- Fantastic

I picked this up half price at the end of season last spring. I hired someone to hang it and sheetrock my garage and hired a plumber for the gas. I waited till this fall to wire it up in preparation for my 2nd Minnesota winter.

I had some self induced pain getting it wired correctly but customer service was wonderful and got me parts I needed extremely quickly without any grief. I put a programmable thermostat in my house and took the old Honeywell T8400C and wired it to the Mr. Heater and it seems to work just fine. I'll update this if anything changes but I'm looking forward to having a useable garage this winter. -- Great Customer Service from Mr. Heater

I got this heater for my garage office. It works as described and no problems thus far. Installation was easy and remember to bleed the lines first before attemting gas hookup. -- Mr. Heater Maxx - Good