Name: Mr. Heater Big Maxx MHU50
Brand: Mr. Heater
Price: 452.79 USD

3.4/5#3 of 13 in gas garage heaters
3.4

The low cost way into vented gas heat for a two car garage. Budget for a thermostat and venting kit.

Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros

The cheapest vented gas unit heater here, often half the maker’s list price on Amazon
Propane conversion kit in the box, so it works with either fuel
Spark ignition, so no pilot burns gas all summer
10 year heat exchanger warranty

Cons

The Mr. Heater Big Maxx family

Every Mr. Heater Big Maxx model we rank, smallest first. Ratings compare each against its own fuel.

Model	Heat	Rating	Price
Mr. Heater Big Maxx MHU50 (this one)	40,000 BTU/h	3.4/5	$452.79
Mr. Heater Big Maxx MHU80	64,000 BTU/h	3.6/5	$545.19
Mr. Heater Big Maxx MHU125	100,000 BTU/h	3.6/5	$934.23

How it scores

The rating comes from 3 measured or published factors, each scored 0-100 against fixed reference points for its fuel. How we rank explains each one.

Value $11.32 per 1,000 BTU ($452.79, 40,000 BTU/h), output modeled from 50,000 BTU/h input at 80%68
Controls electronic ignition40
Warranty 3-year warranty50

A good value gas heater for a big garage or a small shop. Add a thermostat and the vent kit to the budget.

$545.19

One of the two biggest heaters here at a fair price, for a large shop or pole barn.

$934.23

The value pick of the Reznor line for a three or four car garage, with a 5 year parts warranty.

$1,520