A huge tri-fuel generator that can back up a large home in full, wired in by an electrician or through two 50 A outlets. For buyers who want standby-generator output without a permanent install.
Price checked October 28, 2026. As an Amazon Associate we earn from qualifying purchases.
Every Westinghouse WGen V-Twin model we rank, smallest first. Ratings compare each against its own size.
| Model | Running / starting | Rating | Price |
|---|---|---|---|
| Westinghouse WGen14500TFc | 14,500 / 18,000 W | 4.0/5 | $2,699 |
| Westinghouse WGen20000TFc (this one) | 20,000 / 28,000 W | 3.9/5 | $3,899 |
The rating comes from 7 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
| Model number | WGen20000TFc (part 20027) |
|---|---|
| Output | |
| Gasoline | 20,000 W running, 28,000 W starting |
| Propane | 18,000 W running, 25,200 W starting |
| Natural gas | 16,000 W running, 22,400 W starting |
| Outlets | 4 × 120 V, L5-30, L14-30, 14-50 |
| Transfer switch ready | Yes, 240 V |
| Full power at 120 V | No |
| Total harmonic distortion | under 5% |
| Price per watt | $0.19 |
| Fuel and run time | |
| Fuel | Gasoline, propane, natural gas |
| Tank | 17.2 gal |
| Run time (gasoline) | 8 hr at 50% load |
| Engine | 999 cc |
| Noise and safety | |
| Rated noise | 74 dBA |
| CO shutoff | Yes |
| CARB compliant | No |
| Build | |
| Starting | Remote, electric and recoil |
| Wheels | Yes |
| Dimensions | 38 x 35 x 40.4 in |
| Weight | 557 lb |
| Warranty | 3 years |
| Released | 2024-06 |
A very large tri-fuel generator for running a whole house, central air included, through a 50 A transfer switch. Best for homeowners with a natural gas line who want standby-like power without a permanent install.
Amazon $2,699A large dual-fuel generator for whole-home backup through a 50 A or 30 A transfer switch. Worth it only at a clear discount to the newer CO-sensor models, since it lacks CO shutoff.
Amazon $999A large fuel-injected tri-fuel generator for whole-house backup through a 50 A transfer switch, and one of the few this size that California buyers can get.
Amazon $3,499Compare the Westinghouse WGen20000TFc with any other portable generator →
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