DuroMax XP12000EH Dual Fuel
The 'beast' — a 457cc engine and a 240V-priority switch the others don't have.
Specs
| Running watts | 9,500 W |
| Starting watts | 12,000 W |
| On propane | 9,025 W run · 11,400 W start |
| Type | Open frame |
| Fuel | Dual fuel (gas + propane) |
| Weight | 224 lb |
| Fuel tank | 8.3 gal |
| Runtime (mfr claim) | ~8.8 h on gasoline at 50% load |
| Outlets | Two 20A 125V GFCI, L14-30R (transfer switch), 14-50R (240V/50A), 120/240V switchable |
| Start | Electric |
| CO safety shutoff | Varies by version — check the listing |
| Typical street price | ~$1,400 (fluctuates — check listing) |
Figures are the manufacturer's published specs; dashes mean the maker doesn't publish a number. Verify against the current datasheet before you buy.
What can it actually run?
Checked with the same math as our calculator: total running watts, plus the single largest motor surge on top. “Tight” means it technically fits but the load sits above 80% of rated output — fine briefly, not where you want to live.
- ✓ runs itFridge, Wi-Fi, and lights730 W running · 2,230 W peak
- ✓ runs itStorm essentials (fridge, freezer, furnace fan, sump pump)3,080 W running · 4,630 W peak
- ✓ runs itEssentials plus a 10,000 BTU window AC4,280 W running · 6,680 W peak
- ✗ too muchMost of the house (well pump, central AC, laundry)13,680 W running · 19,680 W peak
The installer's take
DuroMax's party trick is the MX2 switch: dump the 120V legs and push the full output through 240V, which matters when you're starting a big well pump or AC condenser at the edge of the unit's surge. The 8.3-gallon tank is the largest here. It's crude next to a Westinghouse in fit and finish, but the bones are heavy-duty and owners run these hard for years.
Pros
- MX2 full-power 240V mode for hard motor starts
- Largest fuel tank in this roundup
- Dual fuel with strong propane ratings
Cons
- Loud and heavy even by open-frame standards
- Controls and manual feel a generation behind