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
3.1/5
For garages, job sites and barns with fresh air that need fast heat from a standard 20 lb tank. It is a construction heater, not for living spaces.
- 30,000 to 65,000 BTUHeat output
- Job sites and garagesUse
- None publishedSafety listing
- 1 yearWarranty
Check price at Amazon$168.35
Price checked October 30, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Turns down to about half its 65,000 BTU top setting for milder days
- Rated to heat about 1,625 sq ft from a 20 lb tank, by DeWalt’s figure
- Shuts the gas off if the flame goes out, and cuts out if it overheats
- Long 20 ft hose lets the tank sit well away from the heater
Cons
- Needs a 120V outlet or generator to run
- Construction heater only, for well ventilated spaces, not living areas
- No thermostat, despite what the Amazon listing says
- No safety listing mark named in DeWalt’s material
The DeWalt forced air family
Every DeWalt forced air model we rank, smallest first. Ratings compare each against its own type.
| Model | Heat output | Rating | Price |
|---|---|---|---|
| DeWalt DXH65FAV 65,000 BTU (this one) | 30,000 to 65,000 BTU | 3.1/5 | $168.35 |
| DeWalt DXH90FAV 90,000 BTU | 50,000 to 90,000 BTU | 3.5/5 | $230.77 |
| DeWalt DXH150FAV 150,000 BTU | 110,000 to 150,000 BTU | 3.2/5 | $251.21 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | DXH65FAV (F340710) |
|---|---|
| Heating | |
| Heat output | 30,000 to 65,000 BTU |
| Type | Forced air |
| Use | Job sites and garages |
| Heats up to | 1,625 sq ft |
| Thermostat | No |
| Fan | Yes |
| Fuel and power | |
| Fuel | Bulk tank |
| Hose included | Yes |
| Ignition | Electric |
| Power needed | 120 V outlet |
| Safety | |
| Safety listing | None published |
| Flame-out shutoff | Yes |
| Build | |
| Dimensions | 11.5 x 19.75 x 14.25 in |
| Weight | 17.1 lb |
| Warranty | 1 year |
| Released | 2012-10 |
Alternatives in this type
Remington REM-60V-GFA-O 60,000 BTU
#13 in Forced airFull review
For a cheap, light torpedo heater to warm a garage bay or job site from a 20 lb tank. Use it only with a fresh air opening, as the manual sets out.
Amazon $114.99$114.99
Mr. Heater MH85QFAV 85,000 BTU
#15 in Forced airFull review
For garages, barns and job sites with fresh air that need strong heat from a 20 lb tank. It is a construction heater, not for living spaces.
Amazon $199.05$199.05
Compare
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