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Generac and Westinghouse generators compete in home backup. This comparison looks at price, power and reliability.
Price: what you pay per unit of power
Westinghouse portables are usually cheaper per watt than Generac portables. Generac standby systems cost more but provide automatic backup.
For gas generators, compare price per running watt within the same class, then add the features that matter to you, such as electric start, dual fuel or inverter output. Inverters cost more per watt but are quieter and more fuel efficient at light loads.
| Generator class | Typical street price range | Tank size | Typical runtime at 50% load |
|---|---|---|---|
| 2,000-2,500W inverter | $450-1,200 | ~1-1.2 gal | ~4-8 h |
| 3,500-4,500W open-frame | $400-800 | ~3.5-4.5 gal | ~9-12 h |
| 7,500-9,500W open-frame | $800-1,400 | ~6-7 gal | ~8-11 h |
| 12,000W+ dual/tri fuel | $1,200-2,000+ | ~8 gal | ~8-10 h |
Power: output, surge and refuelling
Generac
Generac portable units cover common home-backup sizes, while its standby units provide permanent whole-home power with automatic transfer.
Westinghouse
Westinghouse’s range covers compact inverters to large 12,000W-plus-class dual-fuel units, with a reputation for strong feature sets at each size.
Generac standby units provide permanent whole-house power. Westinghouse portables cover up to about 12,000W-plus in dual fuel.
Reliability: what actually fails
Generac
Generac’s dealer network helps with service. Standby units need professional maintenance, while portable units follow standard small-engine care.
Westinghouse
Westinghouse units are generally reliable with good build quality for the price; as always, fuel stabiliser and regular oil changes prevent most problems.
For any gas generator, most failures are preventable: change the oil after the first 5-25 hours of break-in and then roughly every 50-100 hours, run or drain the carburettor before storage, use fuel stabiliser, and start the unit monthly. Propane avoids stale-fuel problems entirely, which is a big reason dual fuel is popular for emergency backup.
Gasoline, propane or natural gas?
Most mid-size models from both brands offer dual fuel, and some add natural gas. Fuel choice affects output, storage and running cost, so it deserves as much thought as the brand.
| Fuel | Output vs gasoline | Storage life | Main drawback |
|---|---|---|---|
| Gasoline | 100% (baseline) | ~3-6 months untreated, ~12-24 with stabiliser | Stale fuel gums carburettors |
| Propane | ~88-92% | Indefinite in a sound tank | More fuel used per hour |
| Natural gas (tri-fuel) | ~75-85% | Unlimited utility supply | Needs a permanent hookup by a pro |
For emergency backup, propane is the low-maintenance choice because it never goes stale and 20 lb cylinders are easy to swap at hardware stores. A standard 20 lb cylinder holds about 4.7 gallons of propane, which runs a mid-size generator for roughly 5-10 hours at moderate load. Gasoline still offers the most output per tank and the longest runtime per gallon.
Cost to run: fuel math
Fuel is the ongoing cost of a gas generator. Consumption depends mainly on load, so the numbers below are typical ranges at about 50% load with gasoline at around $3.50 per gallon. Propane usually costs more per hour of runtime because it holds less energy per gallon.
| Generator class | Fuel use at 50% load | Cost per hour | Cost per 24 h |
|---|---|---|---|
| 2,000-2,500W inverter | ~0.15-0.25 gal/h | ~$0.50-0.90 | ~$13-21 |
| 3,500-4,500W open-frame | ~0.3-0.4 gal/h | ~$1.05-1.40 | ~$25-34 |
| 7,500-9,500W open-frame | ~0.6-0.75 gal/h | ~$2.10-2.60 | ~$50-63 |
| 12,000W+ dual fuel | ~0.8-1.0 gal/h | ~$2.80-3.50 | ~$67-84 |
Over a three-day outage, a mid-size generator can easily burn 15-20 gallons, so plan fuel storage (with stabiliser) or a propane supply before storm season.
Safety and placement
Carbon monoxide is the biggest risk with any gas generator. Run it outdoors only, at least 20 feet from the house with the exhaust pointed away from doors, windows and vents, and never in a garage, even with the door open. Choose models with automatic CO shutoff where possible and install battery CO alarms inside. Connect to home circuits only through a transfer switch or interlock installed by a licensed electrician, which prevents dangerous backfeed onto utility lines.
What to buy at each budget
- Under $600: Westinghouse inverters.
- $600-1,500: Westinghouse or Generac dual-fuel portables.
- Several thousand dollars installed: Generac standby.
Category verdicts
| Category | Edge | Why |
|---|---|---|
| Price | Westinghouse | Cheaper portables |
| Whole-home backup | Generac | Standby systems |
| Portable features | Westinghouse | Remote start, CO sensing |
| Service network | Generac | Dealer network |
| Reliability | Tie | Both reliable with maintenance |
FAQ
How much does a standby generator cost?
A home standby system often costs several thousand dollars installed. A portable plus transfer switch costs much less.
Which is quieter?
Standby units are enclosed and often quieter than open-frame portables. Inverters are quietest.
Bottom line
Westinghouse wins on portable price and features, Generac on standby systems and service, and both are reliable.
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