DeWalt DXH150FAV 150,000 BTU
#11 in Forced airFull review
For large job sites, barns and warehouses with plenty of fresh air that need maximum heat. Smaller garages are better served by a heater that turns down further.
Amazon $251.21$251.21
The DeWalt DXH150FAV 150,000 BTU and the Mr. Heater MH400FAVT 400,000 BTU are evenly matched, rated 3.2 and 3.1. The DeWalt DXH150FAV 150,000 BTU leads on safety. The Mr. Heater MH400FAVT 400,000 BTU wins on turndown. The DeWalt DXH150FAV 150,000 BTU costs $414.63 less ($251.21 vs $665.84).
Mr. Heater MH400FAVT 400,000 BTU
#12 in Forced airFull review
For large construction sites, barns and warehouses that need heat on an industrial scale from a bank of 100 lb tanks. Use it only with plenty of fresh air.
Amazon $665.84$665.84
Prices were last checked October 30, 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 DeWalt DXH150FAV 150,000 BTU for safety (flame-out shutoff; no safety listing published vs none stated; no safety listing published).
- Choose the Mr. Heater MH400FAVT 400,000 BTU for turndown (turns down to 250,000 BTU vs turns down to 110,000 BTU).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every forced air propane heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | DeWalt DXH150FAV 150,000 BTU | Mr. Heater MH400FAVT 400,000 BTU |
|---|---|---|
| Overall rating | 3.2/5 | 3.1/5 |
| Value 25% | 68 $1.67 per 1,000 BTU ($251.21, 150,000 BTU) | 68 $1.66 per 1,000 BTU ($665.84, 400,000 BTU) |
| Safety 30% | 40 flame-out shutoff; no safety listing published | 30 none stated; no safety listing published |
| Warranty 15% | 0 1-year warranty | 0 1-year warranty |
| Turndown 15% | 38 turns down to 110,000 BTU | 54 turns down to 250,000 BTU |
| Ignition 10% | 100 electric ignition | 100 electric ignition |
| Fuel options 5% | 50 runs on a bulk tank only | 50 runs on a bulk tank only |
Specifications
| DeWalt DXH150FAV 150,000 BTU | Mr. Heater MH400FAVT 400,000 BTU | |
|---|---|---|
| Heating | ||
| Heat output | 110,000 to 150,000 BTU | 250,000 to 400,000 BTU |
| Type | Forced air | Forced air |
| Use | Job sites and garages | Job sites and garages |
| Heats up to | - | 10,000 sq ft |
| Thermostat | No | Yes |
| Fan | Yes | Yes |
| Fuel and power | ||
| Fuel | Bulk tank | Bulk tank |
| Hose included | Yes | Yes |
| Ignition | Electric | Electric |
| Power needed | 120 V outlet | 120 V outlet |
| Safety | ||
| Safety listing | None published | None published |
| Flame-out shutoff | Yes | - |
| Build | ||
| Dimensions | 11.75 x 26 x 16 in | 21.9 x 38.6 x 14.8 in |
| Weight | 22.5 lb | 56.4 lb |
| Warranty | 1 year | 1 year |
| Released | - | 2010-01 |