DuroMax 15,000 Watt Electric Start Dual Fuel EFI Portable Generator…

Q: How many watts is the DuroMax 15,000 Watt Electric Start Dual Fuel EFI Portable Generator?

12,000 running watts and 15,000 starting watts as listed.

Q: Can the DuroMax 15,000 Watt Electric Start Dual Fuel EFI Portable Generator run my refrigerator and sump pump together?

Refrigerator (modern, about 18–22 cu ft): yes. Sump pump (1/3 hp): yes. Totals still need to stay within the rating when they run at once.

Q: Can I connect it to my house?

Only through a properly rated transfer switch or interlock installed by a licensed electrician. Never backfeed through a wall outlet.

What it can run

Generators are sized in watts. Running watts are what the unit can supply continuously; starting watts are a short surge for motors and compressors. The DuroMax 15,000 Watt Electric Start Dual Fuel EFI Portable Generator is rated at 12,000 W running and 15,000 W starting.

Appliances this generator can run, by watts
Appliance (typical)	Running / starting watts	Can it run it?
Refrigerator (modern, about 18–22 cu ft)	150 W / 600 W start	Yes
Chest freezer (about 7 cu ft)	100 W / 400 W start	Yes
Sump pump (1/3 hp)	800 W / 1,500 W start	Yes
Well pump (1/2 hp)	1,000 W / 2,100 W start	Yes
Gas furnace blower	750 W / 1,500 W start	Yes
Window air conditioner (5,000–8,000 BTU)	600 W / 1,800 W start	Yes
CPAP with heated humidifier	70 W	Yes
Home oxygen concentrator	300 W	Yes
Wi-Fi router and modem	25 W	Yes
LED television (55 in)	100 W	Yes
LED lighting (10 bulbs)	100 W	Yes
Laptop and charger	60 W	Yes
Phones and tablets charging (4)	40 W	Yes
Ceiling or box fan	75 W / 150 W start	Yes
Microwave oven (1,000 W cooking)	1,500 W	Yes
Coffee maker	900 W	Yes
Garage door opener (1/2 hp)	550 W / 1,100 W start	Yes
Washing machine	500 W / 1,300 W start	Yes
Electric space heater (1,500 W)	1,500 W	Yes
Central air conditioner (3-ton)	3,500 W / 10,500 W start	Yes

Wattstanding calculationWattstanding calculation — to size a generator, add the running watts of everything you will run at once, then add the largest single starting surge (starting − running watts) from any one motor. The result must stay within the generator's running and starting watts. Appliance wattages are typical planning values — read the nameplate.

Use the load calculator to total your own appliances.

Fuel and runtime

The maker states a 8.3-gallon tank and up to 17.9 hours at the stated load, which implies about 0.46 gallons per hour at that load.

Wattstanding calculation8.3 gal ÷ 17.9 h = 0.46 gal/h; a full day at that load ≈ 11 gal. Multiply by today's fuel price for a daily cost, or use the fuel calculator.

Seller or manufacturer claim17.9 hrs

Multi-fuel units usually produce less power on propane or natural gas than on gasoline; the maker's per-fuel ratings are the ones to size against.

Connecting it to a home

To power home circuits you need a rated transfer switch or interlock and an inlet, matched to this generator's outlet and amperage, installed by a licensed electrician.

Check the pairing in the generator ↔ transfer-switch compatibility matrix.

SafetyNever plug a generator or battery system into a wall outlet to power the house ("backfeeding"): it can send electricity back into the utility lines and injure line workers, and it can start fires. Connecting a generator to a home's wiring is a job for a licensed electrician, with the permit and inspection your local code requires. Wattstanding does not give wiring instructions.

Safety and placement

SafetyNever run a generator inside a home, garage, basement or any enclosed or partly enclosed space — exhaust contains carbon monoxide, which can kill in minutes. Keep it outdoors, well away from doors, windows and vents, with the exhaust pointed away from the house, and use battery-powered carbon monoxide alarms indoors. Follow the maker's manual and U.S. Consumer Product Safety Commission guidance.

This listing mentions a carbon monoxide shutoff or sensor, which is a useful backup — not a substitute for placing the generator outdoors and keeping working CO alarms inside.

Fit check before you buy

Checks to make against your loads, fuel plan and home before ordering.

✓ Required? Check firsti Good to know

✓WattsKeep the running total under 12,000 W and the largest start under 15,000 W.
?Fuel supplyPlan fuel storage and supply for gasoline, propane; check local rules on storing fuel.
?Home connectionA transfer switch or interlock and inlet must match the generator's outlet and amperage and be installed by a licensed electrician.
iPlacement and noiseOutdoors only, away from openings; the maker states about 74 dB.

Specifications

Each figure is labelled with where it comes from. Numbered references link to the source list below.

Manufacturer storeRetailer listingWattstanding calculationNot verified

Published specifications

Running (rated) watts	12,000 W[S1]	Manufacturer store
Starting (peak) watts	15,000 W[S1]	Manufacturer store
Fuel types	Gasoline, Propane[S1]	Manufacturer store
Fuel tank (gasoline)	8.3 gal[S1]	Manufacturer store
Stated runtime	17.9 hrs[S1]	Manufacturer store
Noise (as stated)	74 dB[S1]	Manufacturer store
Starting system	Push Button[S1]	Manufacturer store
Carbon monoxide shutoff	Listed[S1]	Manufacturer store
Engine	500 cc[S1]	Manufacturer store
Total harmonic distortion	<5%[S1]	Manufacturer store
Warranty	5 Year[S1]	Manufacturer store

Wattstanding calculations

Appliances it can run by watts	20 of 20	Wattstanding calculation
Implied fuel burn at the stated load	0.46 gal/h	Wattstanding calculation
Price per running watt	$0.24	Wattstanding calculation

Limitations to weigh

Specifications are the maker's or seller's; Wattstanding has not tested this product.
Runtime and fuel figures are the maker's stated values or our labelled calculations.
Prices change; confirm the price, stock and what is included before ordering.

Alternatives worth comparing

FIRMAN Gas Portable Generator 15000/12000W Electric Start 120/240V (P12002)12,000 W running, gasoline; $101 more

DuroMax 15,000 Watt Electric Start Tri Fuel Portable Generator (XP15000HXT)12,000 W running, gasoline/propane/natural gas; $300 less

Westinghouse Outdoor Power iGen12000TFc Inverter Generator - Tri-Fuel11,000 W running, gasoline/propane/natural gas; $600 less

A-iPower 10700W Electric Start Portable Generator Gas Propane (AP10700ED)8,500 W running, gasoline/propane; $1,749 less

Where to buy

Our link opens this exact product page. Prices and stock change; check before you order.

$2,899DuroMax listed price (base model) · seen 30 Sep 2026

View at DuroMax Check price on Amazon

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Questions buyers ask

How many watts is the DuroMax 15,000 Watt Electric Start Dual Fuel EFI Portable Generator?

12,000 running watts and 15,000 starting watts as listed.

Can the DuroMax 15,000 Watt Electric Start Dual Fuel EFI Portable Generator run my refrigerator and sump pump together?

Refrigerator (modern, about 18–22 cu ft): yes. Sump pump (1/3 hp): yes. Totals still need to stay within the rating when they run at once.

Can I connect it to my house?

Only through a properly rated transfer switch or interlock installed by a licensed electrician. Never backfeed through a wall outlet.

Where can I buy the DuroMax 15,000 Watt Electric Start Dual Fuel EFI Portable Generator?

1 seller list it: DuroMax.

Sources and verification

DuroMax — 15,000 Watt Electric Start Dual Fuel EFI Portable Generator — product page and specifications Retrieved 30 Sep 2026

Wattstanding has not tested this product hands-on. This reference is compiled from the sources above; our calculations are labelled and show their working. Electrical work belongs to a licensed electrician. Last verified 30 Sep 2026. How we work

DuroMax 15,000 Watt Electric Start Dual Fuel EFI Portable Generator

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