Mr. Heater Big Maxx MHU50
#3 in GasFull review
The low cost way into vented gas heat for a two car garage. Budget for a thermostat and venting kit.
Amazon $452.79$452.79
The Mr. Heater Big Maxx MHU50 is the better garage heater overall, rated 3.4 to 2.2. The Mr. Heater Big Maxx MHU50 leads on warranty. The Mr. Heater Big Maxx MHU50 costs $546.20 less ($452.79 vs $998.99).
Modine Hot Dawg HD30
#12 in GasFull review
Vented gas heat for a one car garage from a long running commercial heater maker. You pay a lot per BTU at this size.
Amazon $998.99$998.99
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Mr. Heater Big Maxx MHU50 for warranty (3-year warranty vs 2-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every gas garage heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Mr. Heater Big Maxx MHU50 | Modine Hot Dawg HD30 |
|---|---|---|
| Overall rating | 3.4/5 | 2.2/5 |
| Value 40% | 68 $11.32 per 1,000 BTU ($452.79, 40,000 BTU/h), output modeled from 50,000 BTU/h input at 80% | 6 $40.12 per 1,000 BTU ($998.99, 24,900 BTU/h) |
| Controls 25% | 40 electronic ignition | 40 electronic ignition |
| Warranty 35% | 50 3-year warranty | 25 2-year warranty |
Specifications
| Mr. Heater Big Maxx MHU50 | Modine Hot Dawg HD30 | |
|---|---|---|
| Heat | ||
| Heat output | 40,000 BTU/h | 24,900 BTU/h |
| Gas | Both | Both |
| Efficiency | 80% | 83% |
| Venting | Power vented | Power vented |
| Rated garage | 1,667 sq ft | - |
| Controls and build | ||
| Thermostat | No | No |
| Remote or app | No | No |
| Electronic ignition | Yes | Yes |
| Weight | 70 lb | - |
| Warranty | 3 years | 2 years |
| Released | 2014-01-03 | - |