Champion 22kW aXis
#1 in 15 to 22 kWFull review
For homes with central air that want whole-house backup for the least money and a long parts warranty.
Norwall $5,699$5,699
The Champion 22kW aXis is the better standby generator overall, rated 4.2 to 4.0. The Champion 22kW aXis leads on value. The Champion 22kW aXis costs $700 less ($5,699 vs $6,399).
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
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 aXis for value ($259 per kW ($5,699 with transfer switch, 22 kW on propane) vs $291 per kW ($6,399 with transfer switch, 22 kW on propane)).
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 aXis | Champion 22kW fleX |
|---|---|---|
| Overall rating | 4.2/5 | 4.0/5 |
| Value 35% | 67 $259 per kW ($5,699 with transfer switch, 22 kW on propane) | 49 $291 per kW ($6,399 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 | 42 67 dBA rated in normal operation |
| Power quality 10% | 83 under 5% THD | 83 under 5% THD |
| Warranty 25% | 100 10-year warranty | 100 10-year warranty |
Specifications
| Champion 22kW aXis | Champion 22kW fleX | |
|---|---|---|
| Output | ||
| Rated output, propane | 22 kW | 22 kW |
| Rated output, natural gas | 19.8 kW | 19.8 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 | No |
| Enclosure | Steel | Aluminum |
| Dimensions | 54 x 30.3 x 43.9 in | 59.4 x 31.5 x 45.9 in |
| Weight | 634.3 lb | 697 lb |
| Noise and warranty | ||
| Noise, normal operation | 67 dBA | 67 dBA |
| Warranty | 10 years | 10 years |