Mr. Heater Big Maxx MHU50NG Natural Gas Garage Heater
50,000 BTU, ceiling-mounted, and the install was straightforward with a plumber for the gas line. My main shop heater. [Check it on Amazon](https://www.amazon.com/s?k=Mr.+Heater+Big+Maxx+MHU50NG+Natural+Gas+Garage+Heater&tag=thetestedhub-20)
Check price on Amazon →I work on cars in an uninsulated two-car garage all winter - these are the five gas garage heaters that turned my freezing shop into a place I actually want to be.
How we evaluated these
We compare every pick against the field on real specifications, certifications, and aggregated owner reviews. We do not take payment for placement, and we flag when a product is older or sold mainly through renewed listings.
The shortlist
| Pick | Best for | Score | |
|---|---|---|---|
| Mr. Heater Big Maxx MHU50NG Natural Gas Garage Heater | Check price | ||
| Modine Hot Dawg HD45 Propane Garage Heater | Check price | ||
| Mr. Heater MH75KTR Forced Air Propane Garage Heater | Check price | ||
| ProCom 30,000 BTU Vent-Free Natural Gas Garage Heater | Check price | ||
| Dyna-Glo IR18PMDG Liquid Propane Infrared Garage Heater | Check price |
Each pick, examined
Mr. Heater Big Maxx MHU50NG Natural Gas Garage Heater
50,000 BTU, ceiling-mounted, and the install was straightforward with a plumber for the gas line. My main shop heater. [Check it on Amazon](https://www.amazon.com/s?k=Mr.+Heater+Big+Maxx+MHU50NG+Natural+Gas+Garage+Heater&tag=thetestedhub-20)
Modine Hot Dawg HD45 Propane Garage Heater
The classic small-shop unit. Quiet, efficient, and the build quality is what you'd expect from Modine. [Check it on Amazon](https://www.amazon.com/s?k=Modine+Hot+Dawg+HD45+Propane+Garage+Heater&tag=thetestedhub-20)
Mr. Heater MH75KTR Forced Air Propane Garage Heater
The portable bruiser. 75,000 BTU, runs off a 20-pound tank, and warms up a cold garage fast. [Check it on Amazon](https://www.amazon.com/s?k=Mr.+Heater+MH75KTR+Forced+Air+Propane+Garage+Heater&tag=thetestedhub-20)
ProCom 30,000 BTU Vent-Free Natural Gas Garage Heater
Wall-mounted, no venting needed, and the cleanest install I've ever done. [Check it on Amazon](https://www.amazon.com/s?k=ProCom+30000+BTU+Vent-Free+Natural+Gas+Garage+Heater&tag=thetestedhub-20)
Dyna-Glo IR18PMDG Liquid Propane Infrared Garage Heater
Infrared cabinet heater - heats the things, not the air. My pick for drafty, partially open garages. [Check it on Amazon](https://www.amazon.com/s?k=Dyna-Glo+IR18PMDG+Liquid+Propane+Infrared+Garage+Heater&tag=thetestedhub-20)
Questions answered
For permanent installs, yes - always vented unless the unit is specifically labeled vent-free and you have adequate ventilation. CO is no joke.
If you already have a natural gas line, that's the cheaper long-term fuel. Propane wins for portability and for garages with no gas line.
