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Westinghouse WGen11500DFc Review: The One I'd Pick for Most Houses

By Justin · Updated September 25, 2026

Most big portable generators make you pick between two things: raw watts or clean power. The WGen11500DFc gives you both. It makes 11,500 running watts on gas, runs on propane too, and Westinghouse rates its output at 5% THD or less, the same range as an inverter generator, without the inverter price. It also comes with a CO sensor, a 9.5-gallon tank, and a key fob to start it from inside the house.

The downsides are simple: it's big, it weighs 230 pounds, and it's loud enough that you won't forget it's running.

WGen11500DFc Specs at a Glance

Specs from Westinghouse's product page. Runtime figures are the manufacturer's, and real runtime depends on what you plug in.

What I Like

Clean power from a regular generator

This is the feature that sets it apart. Most conventional open-frame generators are rated around 20–25% THD. The smaller WGen9500DF is rated up to 23%. The 11500DFc is rated at 5% or less. In practice, that means you don't need a UPS or a separate inverter generator for the computer, TV, modem, or the control board on a newer furnace. You plug them in like normal.

You used to have to buy an inverter to get power this clean. Here you get it with a conventional engine and alternator, which are simpler and cheaper to fix.

Enough watts to run a real chunk of the house

Owners regularly say it runs most of their house during outages, and some mention running a pool pump or a fifth-wheel camper off it. That lines up with the numbers. 11,500 running watts handles a central AC plus the essentials, which a 9,500-watt generator struggles to do. The 50A outlet is what lets you use most of that power. The 30A twist-lock tops out around 7,200 watts no matter how big the generator is.

The big tank makes long outages less painful

9.5 gallons and a rated 19 hours at quarter load means you can run it through the night without going out with a gas can at 3 a.m. At heavier loads you'll still refill once or twice a day, but that's a lot better than the 6–7 gallon tanks on most generators this size.

Propane when you want it

Gas goes stale, and old gas is the top reason generators don't start when you need them. Propane keeps for years. You lose 1,000 running watts on propane, which you'll rarely notice with this much headroom. My suggestion: keep a couple of full propane tanks as your storage fuel, and use gas once an outage stretches into days.

Easy to start, and the CO sensor comes standard

Owners mention that setup is simple and that it starts in a few seconds. You have three ways to start it: the fob, the push button, or the pull cord if the battery dies. The CO sensor shuts the engine off if carbon monoxide builds up around it. That doesn't replace running it in the right place, but it's a serious safety backup, and it's standard here.

What I Don't Like

It's heavy

230 pounds. The wheels and handle get it across a flat driveway, but steps, gravel, or a truck bed need two people and some planning. Pick where it will live and where it will run before you need it.

It's not quiet

74 dBA is about what you'd expect from a generator this size. Some owners are surprised by how quiet it is, and others think it's loud. That usually depends on what they were comparing it to. If you've used a small inverter generator, this will seem loud. Next to an old contractor generator, it's reasonable. Either way, your neighbors will hear it.

Know your surge needs before you buy

14,500 peak watts is plenty for most homes, but it has limits. A large central AC without a soft-start kit, a big well pump, and everything else kicking on at the same time can go over it. If you need 20,000+ surge watts, you're in home standby generator territory. Add up your loads first (the table below will help).

Not available in California

It isn't CARB compliant, so it can't be sold or shipped to California.

What Can the WGen11500DFc Actually Run?

These are typical numbers. Check the labels on your own appliances, because they vary a lot.

A summer-outage setup that fits: central AC (with a soft-start kit), fridge, chest freezer, well pump, sump pump, lights and internet. That's about 8,500 running watts, with room left for the startup surges.

What doesn't fit at the same time: add the electric water heater or the dryer to that list and you're over. Run them on their own while the AC is off.

How Much Fuel Will You Need?

Using Westinghouse's own runtime numbers:

• Light load (about 2,900 W): a full 9.5-gallon tank lasts about 19 hours. That's about 12 gallons a day.
• Medium load (about 5,750 W): a tank lasts about 9.5 hours. That's about 24 gallons a day.
• Propane at medium load: a 20 lb tank lasts about 7 hours, so plan on 3 to 4 tanks a day.

For a three-day outage with the AC running, plan on 50 to 70 gallons of gas. That's a lot to store, and it's why most people end up running it in shifts, or switching to propane once the gas runs low.

Hooking It Up to Your House

Use a transfer switch or a panel interlock with an inlet box, installed by a licensed electrician. Go with a 50A inlet if you can, since that's how you get most of the generator's power into your panel. Never backfeed through a dryer outlet with a double-male cord. It's illegal, and it can kill a lineworker.

This generator has a bonded neutral. Mention that to your electrician so it's set up correctly for your transfer switch.

Want it automatic? This generator works with Westinghouse's WATS200 automatic transfer switch, which starts it on its own when the power goes out, even if you're not home.

WGen11500DFc vs WGen9500DF vs Oxseryn 12000W

At Westinghouse's list prices, the WGen11500DFc costs only about $50 more than the WGen9500DFc. For that, you get 2,000 more running watts, a tank almost 3 gallons bigger, and much cleaner power. Unless the weight or a big sale on the smaller one changes your mind, the 11500DFc is the better buy. The Oxseryn is the one to look at if weight matters more than anything else.

Also compare: the DuroMax XP12000EH has 9,500 running watts, copper windings, and more outlets (including a 120V 30A twist-lock), but no remote start and no published THD.

Questions People Ask

Is the WGen11500DFc safe for electronics?

Yes. It's rated at 5% THD or less, which is the range generally considered safe for computers, TVs, and modern appliance electronics.

Will it run my whole house?

It'll run most of a typical house, including one central AC with a soft-start kit, but not every big appliance at once. Electric water heaters, dryers and ranges are the loads you'll have to take turns with.

What's the difference between the WGen11500DFc and WGen11500TFc?

The WGen11500TFc is the tri-fuel version, which adds natural gas. If you have a natural gas line and want to run it without refueling, that's the one to look at.

How long will it run on a tank of gas?

Westinghouse rates it at up to 19 hours at 25% load and 9.5 hours at 50% load on the 9.5-gallon tank.

Can I buy it in California?

No. It isn't CARB compliant.

How I Put This Review Together

I haven't run this unit myself. This review is based on Westinghouse's published specs, what owners report after using it through real outages, and the watt and fuel math. If I get one in to test, I'll add my own numbers here.

Bottom Line

The WGen11500DFc is the portable generator I'd point most homeowners to. It has enough watts for central air and the essentials, power clean enough for electronics, dual fuel, a big tank, and a CO sensor, all at a price that isn't much more than smaller generators. Just make sure you have a plan for moving 230 pounds, and a 50A inlet to get all that power into the house.

See the Westinghouse WGen11500DFc on Amazon