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When an outage runs past a day or two, fuel beats batteries on sheer runtime. A dual-fuel generator runs on gasoline or propane, so you can use whichever you can get and keep running when one runs short.
These are research-based picks built from manufacturer specs and published data; we do not test products. Every pick below has an automatic carbon-monoxide shutoff feature, because portable generators are a leading source of CO poisoning: CPSC says an average of about 100 people die each year in the U.S. from CO linked to portable generators. Specs were checked on each manufacturer's page on October 27, 2026.
Safety rules before you buy
Never plug a generator into a wall outlet to power the house ("backfeeding"). CPSC warns this can electrocute utility workers and neighbors. To power hard-wired circuits, have a licensed electrician install a transfer switch or interlock. See transfer switch and interlock basics.
Generator sizing: running and starting watts
Generators list running watts (what they can sustain) and starting watts (a brief burst for motor start-up). Add up the running watts of everything you'll run at once, then add the single largest extra start-up draw. On propane, output is lower (about 10% lower for every pick below), so size to the propane numbers if that's the fuel you'll lean on.
| Load | Running W | Starting W |
|---|---|---|
| Refrigerator | 150–400 | 800–1,200 |
| Sump pump, 1/2 HP | 800–1,050 | 1,300–2,150 |
| Well pump, 1 HP (often 240 V) | 1,000–2,000 | 2,000–4,000 |
| Furnace blower, 1/2 HP | 300–800 | 800–1,600 |
| Window AC, 10,000 BTU | 900–1,200 | 1,800–2,400 |
| Space heater | 750–1,500 | None |
- ~3,500 W class: fridge, freezer, sump pump, lights, router and chargers, run through extension cords.
- ~7,500–9,500 W class: adds a furnace blower, a 240 V well pump or a window AC, usually through a transfer switch with an L14-30R connection.
Want your exact running and starting watts? The sizing quiz adds them up and matches a generator for you.
Take the sizing quizOur five picks
Comparison: all picks in this guide
- 01EssentialsChampion 3500W Dual Fuel (201296)
A fridge, sump pump and lights through a multi-day outage on a budget.
- Capacity
- Fuel, 4.7 gal tank
- Cont./surge
- 3,500 / 4,375 W gas3,150 / 3,950 W LP
- Chem./fuel
- Gasoline + Propane
- Weight
- 104.7 lb
- 02QuietestChampion 4500W Dual Fuel Inverter (201321)
Running electronics and essentials with less noise and fuel.
- Capacity
- Fuel, 4.02 gal tank
- Cont./surge
- 3,650 / 4,500 W gas3,285 / 4,500 W LP
- Chem./fuel
- Gasoline + Propane
- Weight
- 92.6 lb
- 03240 V mid-sizeGenerac GP7500E Dual Fuel
Feeding a transfer switch for a furnace blower, fridge and well pump.
- Capacity
- Fuel, 7.9 gal tank
- Cont./surge
- 7,500 / 9,400 W gas6,800 / 8,500 W LP
- Chem./fuel
- Gasoline + Propane
- Weight
- 204 lb
- 04Most outletsWestinghouse WGen9500DFc
Bigger homes that want both L14-30R and 14-50R options and remote start.
- Capacity
- Fuel, 6.6 gal tank
- Cont./surge
- 9,500 / 12,500 W gas8,500 / 11,200 W LP
- Chem./fuel
- Gasoline + Propane
- Weight
- 212.1 lb
- 05Big loadsChampion 9500W Dual Fuel (201508)
Running several motor loads at once through a 240 V transfer switch.
- Capacity
- Fuel, 7.7 gal tank
- Cont./surge
- 9,500 / 12,000 W gas8,550 / 10,800 W LP
- Chem./fuel
- Gasoline + Propane
- Weight
- 216 lb
Champion 3500W Dual Fuel (201296)
EssentialsBest for A fridge, sump pump and lights through a multi-day outage on a budget.
Champion lists 3,500 running / 4,375 starting watts on gasoline (3,150 / 3,950 on propane), up to 14 hours on a tank at half load, and its CO Shield shutoff. It has a 120 V L5-30R locking outlet for a 120 V-only transfer setup.
Strengths
- + Long gasoline runtime for its size
- + CO Shield automatic shutoff
- + L5-30R and RV (TT-30R) outlets
Tradeoffs
- − Recoil start only
- − 120 V only: can't feed 240 V loads
- − Conventional (non-inverter) output
| Fuel | Gasoline + Propane |
| Gasoline | 3,500 W running / 4,375 W starting |
| Propane | 3,150 W running / 3,950 W starting |
| Type | Conventional (open frame) |
| Runtime | Up to 14 h on gasoline / 10.5 h on a 20 lb propane tank at 50% load |
| CO safety | CO Shield automatic shutoff |
| Transfer-switch outlet | L5-30R (120 V only) |
| Noise | 68 dBA at 23 ft |
| Weight | 104.7 lb |
| Start | Recoil |
Specs from the manufacturer's page, checked Oct 27, 2026. Confirm details before you buy.
Champion 4500W Dual Fuel Inverter (201321)
QuietestBest for Running electronics and essentials with less noise and fuel.
An inverter design with 3,650 running / 4,500 starting watts on gasoline (3,285 / 4,500 on propane). Champion lists up to 22 hours on gasoline at a quarter load and 64 dBA, with electric start and CO Shield.
Strengths
- + Inverter output for electronics
- + Very long runtime at light load
- + Electric start, parallel-capable
Tradeoffs
- − No locking transfer-switch outlet (TT-30R RV outlet only)
- − Smaller output than open-frame units of similar weight
| Fuel | Gasoline + Propane |
| Gasoline | 3,650 W running / 4,500 W starting |
| Propane | 3,285 W running / 4,500 W starting |
| Type | Inverter (clean power) |
| Runtime | Up to 22 h on gasoline / 21 h on a 20 lb propane tank at 25% load |
| CO safety | CO Shield automatic shutoff |
| Transfer-switch outlet | None (120 V outlets only) |
| Noise | 64 dBA |
| Weight | 92.6 lb |
| Start | Electric + recoil |
Specs from the manufacturer's page, checked Oct 27, 2026. Confirm details before you buy.
Generac GP7500E Dual Fuel
240 V mid-sizeBest for Feeding a transfer switch for a furnace blower, fridge and well pump.
Generac lists 7,500 running / 9,400 starting watts on gasoline (6,800 / 8,500 on propane), up to 10 hours at half load, electric start and COsense shutdown. The L14-30R outlet connects to a 240 V transfer switch or interlock inlet.
Strengths
- + L14-30R 120/240 V outlet
- + Electric start
- + COsense shutdown
Tradeoffs
- − 204 lb
- − Noise level not stated on Generac's page
- − Conventional (non-inverter) output
- Note: Outlet list confirmed in Generac's owner's manual for the GP-series dual-fuel units.
| Fuel | Gasoline + Propane |
| Gasoline | 7,500 W running / 9,400 W starting |
| Propane | 6,800 W running / 8,500 W starting |
| Type | Conventional (open frame) |
| Runtime | Up to 10 h on gasoline / 5 h on a 20 lb propane tank at 50% load |
| CO safety | COsense shutdown |
| Transfer-switch outlet | L14-30R (120/240 V) |
| Weight | 204 lb |
| Start | Electric + recoil |
Specs from the manufacturer's page, checked Oct 27, 2026. Confirm details before you buy.
Westinghouse WGen9500DFc
Most outletsBest for Bigger homes that want both L14-30R and 14-50R options and remote start.
Westinghouse lists 9,500 running / 12,500 peak watts on gasoline (8,500 / 11,200 on propane), up to 12 hours at 25% load, a CO sensor with automatic shutdown, and electric plus key-fob remote start.
Strengths
- + L14-30R and 14-50R outlets
- + Remote start
- + Westinghouse lists ≤23% THD
Tradeoffs
- − Westinghouse lists it as not CARB compliant (not for sale in California)
- − 212 lb
- − 74 dBA
- Note: Westinghouse lists it as not CARB compliant (not for sale in California).
| Fuel | Gasoline + Propane |
| Gasoline | 9,500 W running / 12,500 W starting |
| Propane | 8,500 W running / 11,200 W starting |
| Type | Conventional (open frame) |
| Runtime | Up to 12 h at 25% load on 6.6 gal gasoline / about 7 h on a 20 lb propane tank at 50% load |
| CO safety | CO sensor with automatic shutdown |
| Transfer-switch outlet | L14-30R or 14-50R (120/240 V) |
| Noise | 74 dBA |
| Weight | 212.1 lb |
| Start | Electric + recoil |
Specs from the manufacturer's page, checked Oct 27, 2026. Confirm details before you buy.
Champion 9500W Dual Fuel (201508)
Big loadsBest for Running several motor loads at once through a 240 V transfer switch.
Champion lists 9,500 running / 12,000 starting watts on gasoline (8,550 / 10,800 on propane), electric start, CO Shield, and both L14-30R and 14-50R outlets. Runtime is shorter on propane: about 4.5 hours on a 20 lb tank at half load.
Strengths
- + L14-30R and 14-50R outlets
- + High starting watts for well pumps
- + CO Shield
Tradeoffs
- − 216 lb
- − Short propane runtime per tank; plan on several tanks
- − 74 dBA at 23 ft
| Fuel | Gasoline + Propane |
| Gasoline | 9,500 W running / 12,000 W starting |
| Propane | 8,550 W running / 10,800 W starting |
| Type | Conventional (open frame) |
| Runtime | Up to 8 h on gasoline at 50% load (7.7 gal); about 4.5 h on a 20 lb propane tank at 50% load |
| CO safety | CO Shield automatic shutoff |
| Transfer-switch outlet | L14-30R or 14-50R (120/240 V) |
| Noise | 74 dBA at 23 ft |
| Weight | 216 lb |
| Start | Electric + recoil |
Specs from the manufacturer's page, checked Oct 27, 2026. Confirm details before you buy.
Want a quieter gasoline-only option for light loads? The Honda EU2200i inverter lists 1,800 running / 2,200 starting watts, 48–57 dBA and Honda's CO-MINDER shutdown. Compare it in power station vs. generator.
Inverter vs. conventional generators
Inverter generators electronically clean up their output and can throttle the engine down at light loads, which is why the Champion 4500 inverter lists 22 hours at a quarter load. Conventional open-frame units deliver more watts per dollar and per pound. For comparison, Westinghouse lists ≤23% total harmonic distortion (THD) for its conventional WGen9500DFc and ≤3% for its iGen inverter line, lower THD is gentler on sensitive electronics.
Fuel planning
- Work out daily fuel from the manufacturer's runtime figure at the load you expect. Half-load runtimes are the most realistic for a typical outage.
- A 20 lb propane tank runs these generators for roughly 4.5–21 hours depending on model and load (manufacturer figures). Plan on several tanks for a multi-day outage.
- Store fuel outdoors or in a detached shed in approved containers, away from the generator's exhaust, and follow your manual's guidance on stabilizer and storage.
- Turn the generator off and let it cool before refueling.
- Running the generator a few hours at a time to recharge a power station and cool the fridge stretches fuel much further than running it 24/7.
Before the next outage
- 01Pick a spot at least 20 ft from the house, away from windows, doors and vents. Keep it away from neighbors' openings too.
- 02Install CO alarms with battery backup on each level and outside sleeping areas.
- 03Buy heavy-duty outdoor extension cords rated for the load, or book a licensed electrician for a transfer switch or interlock.
- 04Start the generator every month or two, under load, per the manual.
- 05Keep oil, a spark plug and the owner's manual with the generator.
FAQ
- Is propane or gasoline better for a generator?
- Gasoline gives slightly more power: about 10% more for the picks in this guide. Propane comes in easy-to-swap 20 lb tanks. A dual-fuel generator lets you use either, which is the main reason to buy one for outages.
- How far from the house should a generator be?
- CPSC says at least 20 feet from the house, outdoors only; CDC says more than 20 feet from windows, doors and vents. Point the exhaust away from the home and install CO alarms inside.
- Can I plug my generator into a wall outlet?
- No. That is called backfeeding and CPSC warns it can electrocute utility workers and neighbors. Use extension cords to individual appliances, or have a licensed electrician install a transfer switch or interlock.
- What size generator runs a whole house?
- Portable generators in the 7,500–9,500 W range can run many essential circuits through a transfer switch, but usually not central AC, an electric range and an electric water heater at once. Whole-home coverage typically means a standby generator installed by a licensed contractor.
Sources
- [1]CPSC: safety tips to prevent carbon monoxide poisoning and fires during winter storms (December 12, 2025)
- [2]CDC: Carbon Monoxide Poisoning Basics (reviewed 2026)
- [3]CPSC Safety Alert: Portable Generator Hazards (Publication 5123) (October 2021)
- [4]Ready.gov: Power Outages (last updated June 4, 2026)
- [5]Champion Power Equipment: Generator Wattage Chart (accessed October 27, 2026)
- [6]Product specs: each manufacturer's product page, linked on every pick, checked October 27, 2026.
Related guides
- Generator Safety: How to Prevent Carbon Monoxide Poisoning →The CDC and CPSC rules: placement, CO alarms, backfeeding, fuel and symptoms to know.
- Transfer Switch and Interlock Basics for Backup Power →How a generator or big power station safely feeds home circuits, and what to ask your electrician.
- Power Station vs. Generator: Runtime, Watts, Safety and Cost Compared →Side-by-side comparison of batteries and fuel generators, and why many homes end up with both.
- Best Portable Power Stations for Power Outages (2026) →Six LiFePO4 picks from phone-and-CPAP size to whole-home scale, with runtime math for each.
Planning the rest of your outage kit? Visit the Outage prep hub: PowerLockdown or The Blackout Kit on PowerLockdown.