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 3.2. The Champion 22kW fleX leads on warranty and value. The Cummins Quiet Connect RS20AC 20kW wins on noise. The Champion 22kW fleX costs $263.42 less ($6,399 vs $6,662.42).
Cummins Quiet Connect RS20AC 20kW
#6 in 15 to 22 kWFull review
For homes with central air that want a quiet 20 kW unit with monitoring included and a service-entrance switch in the box.
Norwall $6,662.42$6,662.42
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 5-year warranty) and value ($291 per kW ($6,399 with transfer switch, 22 kW on propane) vs $333 per kW ($6,662 with transfer switch, 20 kW on propane)).
- Choose the Cummins Quiet Connect RS20AC 20kW for noise (65 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 | Cummins Quiet Connect RS20AC 20kW |
|---|---|---|
| Overall rating | 4.0/5 | 3.2/5 |
| Value 35% | 49 $291 per kW ($6,399 with transfer switch, 22 kW on propane) | 28 $333 per kW ($6,662 with transfer switch, 20 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 | 58 65 dBA rated in normal operation |
| Power quality 10% | 83 under 5% THD | 83 under 5% THD |
| Warranty 25% | 100 10-year warranty | 29 5-year warranty |
Specifications
| Champion 22kW fleX | Cummins Quiet Connect RS20AC 20kW | |
|---|---|---|
| Output | ||
| Rated output, propane | 22 kW | 20 kW |
| Rated output, natural gas | 19.8 kW | 18 kW |
| THD | Under 5% | Under 5% |
| Engine | 999 cc | 999 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 | 34.1 x 36.0 x 27.3 in |
| Weight | 697 lb | 596 lb |
| Noise and warranty | ||
| Noise, normal operation | 67 dBA | 65 dBA |
| Warranty | 10 years | 5 years |