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Mr. Heater · Big Maxx
Mr. Heater Big Maxx MHU50 50,000 BTU Unit Heater (NG, LP kit included)
Model MHU50 · F260550
SCORE7.3 / 10
The garage heater we'd hang where there's gas: 40,000 BTU/h of vented, thermostat-controlled heat for a two- or three-car garage. Budget for a professional gas, vent and electrical install, and expect to clean the flame sensor.
Specs
| Spec | Mr. Heater Big Maxx MHU50 50,000 BTU Unit Heater (NG, LP kit included) |
|---|---|
| Type | Vented gas unit heater |
| Max heat output | 40,000 BTU/h |
| Fuel / power | Natural gas or propane |
| Indoor use per manual | Vented; qualified installer; 8 ft above a garage floor |
| Thermostat | Yes |
| Warranty | 3 yr |
| Input / output | 50,000 BTU/h input, 40,000 BTU/h output, 80% |
| Venting | Category I vertical (3 in on 50K) or Category III horizontal (4 in, 5-25 ft) |
| Electrical | 120 V, 2.3 A; separate disconnect near the unit |
| Mounting | Bottom at least 8 ft above a residential garage floor |
| Warranty | 3 yr parts, 10 yr heat exchanger |
Sources: Mr. Heater MHU 50/80/125 owner's manual #60185 (2017) · mrheater.com MHU50 product page · Amazon listing B00LWW7V7K (part F260550, Creators API)
Before you buy
- Installation and service by a qualified installer, service agency or the gas supplier, per the manual.
- Thermostat sold separately; propane needs an 11-14 in WC regulator (not supplied).
- Never in spaces with gasoline, solvents, paint thinner or airborne dust.
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