Modine Hot Dawg HD75
#8 in GasFull review
A large garage heater from Modine. Reznor’s UDXC 75 costs about the same with a longer parts warranty.
Amazon $1,371$1,371
2.5/5
A proven two car garage heater from a commercial heating maker. Cheaper options give similar heat.
- 37,350 BTU/hHeat
- BothFuel
- NoThermostat
Check price at Amazon$963
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- The most common size for a two car garage
- 83% efficient with direct spark ignition
- 10 year heat exchanger warranty
- Sold for natural gas or propane
Cons
- Needs a wall thermostat and venting kit, bought separately
- 2 year parts warranty
- Costs about twice as much as a Mr. Heater of similar size
The Modine Hot Dawg HD family
Every Modine Hot Dawg HD model we rank, smallest first. Ratings compare each against its own fuel.
| Model | Heat | Rating | Price |
|---|---|---|---|
| Modine Hot Dawg HD30 | 24,900 BTU/h | 2.2/5 | $998.99 |
| Modine Hot Dawg HD45 (this one) | 37,350 BTU/h | 2.5/5 | $963 |
| Modine Hot Dawg HD60 | 49,800 BTU/h | 2.6/5 | $1,204 |
| Modine Hot Dawg HD75 | 62,250 BTU/h | 2.7/5 | $1,371 |
| Modine Hot Dawg HD125 | 102,500 BTU/h | 2.9/5 | $1,552 |
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.
Specifications
| Model number | HD45AS0121 |
|---|---|
| Heat | |
| Heat output | 37,350 BTU/h |
| Gas | Both |
| Efficiency | 83% |
| Venting | Power vented |
| Controls and build | |
| Thermostat | No |
| Remote or app | No |
| Electronic ignition | Yes |
| Weight | 72 lb |
| Warranty | 2 years |
Alternatives in this fuel
Modine Hot Dawg HD60
#9 in GasFull review
A three car garage heater from a commercial maker, for buyers who want Modine’s dealer support.
Amazon $1,324 HVACDirect $1,204$1,204
Modine Hot Dawg HDS45
#11 in GasFull review
The two car garage heater for a shop with sawdust or fumes in the air, where the burner should not use indoor air.
Amazon $1,670.35 HVACDirect $1,327.80$1,327.80
Compare
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