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
3.2/5
For average homes with one central air conditioner that want a whole-house switch included.
- 18 kWPropane
- 17 kWNatural gas
- Included, 200 ATransfer switch
- 5 yearsWarranty
Check price at Amazon$5,975.10
Price checked November 1, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Enough for most of a typical house with one central air conditioner
- 200 A service-entrance switch with surge protection in the box
- Cellular monitoring included, no home Wi-Fi needed
Cons
- 5-year warranty is shorter than Briggs & Stratton and Champion offer
- Load management modules cost extra
The Generac Air-Cooled Standby (2025) family
Every Generac Air-Cooled Standby (2025) model we rank, smallest first. Ratings compare each against its own size.
| Model | Propane | Rating | Price |
|---|---|---|---|
| Generac 10kW Standby 7321 | 10 kW | 3.5/5 | $3,896.10 |
| Generac 14kW Standby 7323 | 14 kW | 3.4/5 | $5,255.10 |
| Generac 18kW Standby 7324 (this one) | 18 kW | 3.2/5 | $5,975.10 |
| Generac 22kW Standby 7325 | 22 kW | 3.4/5 | $6,506.10 |
| Generac 24kW Standby 7326 | 24 kW | 3.2/5 | $6,875.10 |
| Generac 26kW Standby 7328 | 26 kW | 3.2/5 | $7,253.10 |
| Generac 28kW Standby 7329 | 28 kW | 3.1/5 | $8,387.10 |
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 | 7324 (G007324-0) |
|---|---|
| Output | |
| Rated output, propane | 18 kW |
| Rated output, natural gas | 17 kW |
| THD | Under 5% |
| Engine | 817 cc |
| Engine speed | 3,600 rpm |
| Install | |
| Transfer switch | Included, 200 A |
| Load management | No |
| Remote monitoring | Yes |
| Enclosure | Aluminum |
| Dimensions | 46.4 x 26.3 x 30.7 in |
| Weight | 426 lb |
| Noise and warranty | |
| Noise, normal operation | 65 dBA |
| Noise, weekly self-test | 55 dBA |
| Warranty | 5 years |
| Released | 2025 |
Alternatives in this size
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
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
Compare
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