Champion 22kW fleX
#2 in 15 to 22 kWFull review
For coastal or wet climates that want Champion’s 22 kW and long warranty in a rust-proof aluminum housing.
Amazon $6,399$6,399
The Champion 22kW fleX is the better standby generator overall, rated 4.0 to 3.4. The Champion 22kW fleX leads on warranty and value. The Briggs & Stratton PowerProtect+ 22kW wins on noise. The Champion 22kW fleX costs $890 less ($6,399 vs $7,289).
Briggs & Stratton PowerProtect+ 22kW
#3 in 15 to 22 kWFull review
For homes with central air on natural gas that want full output, built-in monitoring and seven years of full cover.
Norwall $7,289 Signature Solar $7,289$7,289
Prices were last checked November 1, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Champion 22kW fleX for warranty (10-year warranty vs 7-year warranty) and value ($291 per kW ($6,399 with transfer switch, 22 kW on propane) vs $331 per kW ($7,289 with transfer switch, 22 kW on propane)).
- Choose the Briggs & Stratton PowerProtect+ 22kW for noise (66 dBA rated in normal operation vs 67 dBA rated in normal operation).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 15 to 22 kw standby generator; a clear win is highlighted. How we rank explains each one.
| Factor weight | Champion 22kW fleX | Briggs & Stratton PowerProtect+ 22kW |
|---|---|---|
| Overall rating | 4.0/5 | 3.4/5 |
| Value 35% | 49 $291 per kW ($6,399 with transfer switch, 22 kW on propane) | 29 $331 per kW ($7,289 with transfer switch, 22 kW on propane) |
| Transfer switch 15% | 100 includes a 200 A transfer switch | 100 includes a 200 A transfer switch |
| Noise 15% | 42 67 dBA rated in normal operation | 50 66 dBA rated in normal operation |
| Power quality 10% | 83 under 5% THD | 83 under 5% THD |
| Warranty 25% | 100 10-year warranty | 57 7-year warranty |
Specifications
| Champion 22kW fleX | Briggs & Stratton PowerProtect+ 22kW | |
|---|---|---|
| Output | ||
| Rated output, propane | 22 kW | 22 kW |
| Rated output, natural gas | 19.8 kW | 22 kW |
| THD | Under 5% | Under 5% |
| Engine | 999 cc | 993 cc |
| Engine speed | 3,600 rpm | 3,600 rpm |
| Install | ||
| Transfer switch | Included, 200 A | Included, 200 A |
| Load management | No | No |
| Remote monitoring | No | Yes |
| Enclosure | Aluminum | Aluminum |
| Dimensions | 59.4 x 31.5 x 45.9 in | 46 x 27 x 28 in |
| Weight | 697 lb | 490 lb |
| Noise and warranty | ||
| Noise, normal operation | 67 dBA | 66 dBA |
| Noise, weekly self-test | - | 62 dBA |
| Warranty | 10 years | 7 years |
| Released | - | 2026-05 |