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 rates 4.2 among 15 to 22 kw standby generators; the Generac 28kW Standby 7329 rates 3.1 among over 22 kw ones. The Champion 22kW aXis costs $2,688.10 less ($5,699 vs $8,387.10).
Generac 28kW Standby 7329
#4 in Over 22 kWFull review
For big all-electric homes that want the most output Generac fits in an air-cooled cabinet.
Amazon $8,387.10$8,387.10
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.
Scores side by side
These two sit in different size classes (15 to 22 kw and over 22 kw), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Champion 22kW aXis | Generac 28kW Standby 7329 |
|---|---|---|
| Overall rating | 4.2/5 | 3.1/5 |
| Value 35% | 67 $259 per kW ($5,699 with transfer switch, 22 kW on propane) | 25 $300 per kW ($8,387 with transfer switch, 28 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 | 29 5-year warranty |
Specifications
| Champion 22kW aXis | Generac 28kW Standby 7329 | |
|---|---|---|
| Output | ||
| Rated output, propane | 22 kW | 28 kW |
| Rated output, natural gas | 19.8 kW | 25 kW |
| THD | Under 5% | Under 5% |
| Engine | 999 cc | 997 cc |
| Engine speed | 3,600 rpm | 3,600 rpm |
| Install | ||
| Transfer switch | Included, 200 A | Included, 200 A |
| Load management | No | Yes |
| Remote monitoring | No | Yes |
| Enclosure | Steel | Aluminum |
| Dimensions | 54 x 30.3 x 43.9 in | 46.4 x 26.3 x 30.7 in |
| Weight | 634.3 lb | 524 lb |
| Noise and warranty | ||
| Noise, normal operation | 67 dBA | 67 dBA |
| Noise, weekly self-test | - | 55 dBA |
| Warranty | 10 years | 5 years |
| Released | - | 2025 |