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
3.4/5
For homes with central air on natural gas that want full output, built-in monitoring and seven years of full cover.
- 22 kWPropane
- 22 kWNatural gas
- Included, 200 ATransfer switch
- 7 yearsWarranty
Check price at Norwall$7,289Check price at Signature Solar$7,289
Price checked November 1, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Full 22 kW on natural gas, more usable power than most 22 kW rivals on gas
- Seven years of parts, labor and travel cover
- Remote monitoring built in, and a short 16-second weekly test
Cons
- Load management needs the separate Symphony II module
- Pricier than Champion’s 22 kW aXis kit
The Briggs & Stratton PowerProtect+ family
Every Briggs & Stratton PowerProtect+ model we rank, smallest first. Ratings compare each against its own size.
| Model | Propane | Rating | Price |
|---|---|---|---|
| Briggs & Stratton PowerProtect+ 18kW | 18 kW | 3.2/5 | $6,899 |
| Briggs & Stratton PowerProtect+ 22kW (this one) | 22 kW | 3.4/5 | $7,289 |
| Briggs & Stratton PowerProtect+ 26kW | 26 kW | 3.3/5 | $8,069 |
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | 40795 (generator 040787) |
|---|---|
| Output | |
| Rated output, propane | 22 kW |
| Rated output, natural gas | 22 kW |
| THD | Under 5% |
| Engine | 993 cc |
| Engine speed | 3,600 rpm |
| Install | |
| Transfer switch | Included, 200 A |
| Load management | No |
| Remote monitoring | Yes |
| Enclosure | Aluminum |
| Dimensions | 46 x 27 x 28 in |
| Weight | 490 lb |
| Noise and warranty | |
| Noise, normal operation | 66 dBA |
| Noise, weekly self-test | 62 dBA |
| Warranty | 7 years |
| Released | 2026-05 |
Alternatives in this size
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
Generac 22kW Standby 7325
#4 in 15 to 22 kWFull review
For typical homes with central air that want the best known brand and a whole-house switch in the box.
Amazon $6,506.10$6,506.10
Compare
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