- Is 300,000 BTU enough for a 10,000 sq ft shop?
- Yes, that is the rated coverage, but it assumes decent insulation and ceiling height. Drafty or poorly insulated buildings may need more than one unit.
- Does it need electricity?
- Yes. The unit needs a 120V supply for the blower and controls, plus a low-voltage thermostat wire. It will not run on gas alone.
- Can I install it myself?
- Only if you are qualified for gas piping and venting. Most owners hire a licensed HVAC or gas fitter, and local codes usually require it.
- Natural gas or propane version?
- This listing is the natural gas model. A propane version exists, but the two use different orifices and are not interchangeable without a conversion kit.
- Does it have a thermostat or Wi-Fi?
- It has no Wi-Fi and no built-in thermostat. It works with a standard low-voltage wall thermostat wired to the unit.
- When is the price lowest?
- Unit heaters tend to discount in late summer and early fall before heating season. The current best is $1,985.99 at The Home Depot as of November 8, 2026.
- Where is the Mr. Heater Big Maxx 300.000 Natural cheapest?
- At The Home Depot, for $1,985.99, as of our latest check.
- Where can I buy the Mr. Heater Big Maxx 300.000 Natural?
- 4 stores we checked sell it, including The Home Depot, Walmart, Blain's Farm & Fleet, Lowe's.