Quick Comparison
| Product | Best For | Rating |
|---|---|---|
| Mr. Heater MH60QFAV | Best Overall | 4.7/5 |
| Dr. Infrared Heater DR-988A | Best Budget | 4.6/5 |
| Modine HD45AS0111 Hot Dawg | Best Premium | 4.7/5 |
| Fahrenheat FUH54 | Best for Large Garages | 4.5/5 |
| Heat Storm HS-1500-PHX | Best Compact | 4.6/5 |
I detached my garage from the house heating zone two years ago and went hunting for a real garage heater. I tried electric, infrared, and finally landed on gas, which is the only way to keep a 600-square-foot shop above 60 in January without a brutal electric bill.
These five made my shortlist after a winter of testing and talking to other gearheads.
1. 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
2. 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
3. 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
4. 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
5. 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
What Matters Most
For me, it’s about three things: BTU per square foot (figure ~30 BTU per sq ft for an insulated garage, more for uninsulated), vent vs vent-free (vent-free needs serious ventilation), and how loud the burner is. Some cheap units sound like a jet engine on startup.
My Setup
The Mr. Heater Big Maxx is mounted to the ceiling in the back corner, ducted vent through the roof, and runs off the natural gas line. I keep the Mr. Heater MH75KTR portable as backup for when I open the door for car work and need a fast reheat.
Common Mistakes
People undersize the heater and run it on max all the time, killing its lifespan. Always size up by 25%. The other big mistake is not adding any air circulation - even a small fan circulating the warm air drops your fuel bill noticeably.
Final Recommendation
For a permanent install with natural gas, the Mr. Heater Big Maxx MHU50NG is the best balance of price, output, and reliability. If you want portable propane that just works, the Mr. Heater MH75KTR is unbeatable.
Frequently asked questions
Do I need to vent a gas garage heater?+
For permanent installs, yes - always vented unless the unit is specifically labeled vent-free and you have adequate ventilation. CO is no joke.
Propane or natural gas - which is better?+
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.