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
The Cummins Quiet Connect RS20AC 20kW and the Briggs & Stratton PowerProtect+ 18kW are evenly matched, rated 3.2 and 3.2. The Cummins Quiet Connect RS20AC 20kW leads on value and noise. The Briggs & Stratton PowerProtect+ 18kW wins on warranty. The Cummins Quiet Connect RS20AC 20kW costs $236.58 less ($6,662.42 vs $6,899).
Briggs & Stratton PowerProtect+ 18kW
#7 in 15 to 22 kWFull review
For average homes on natural gas that want full rated output and a long warranty with service included.
Norwall $6,899$6,899
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 Cummins Quiet Connect RS20AC 20kW for value ($333 per kW ($6,662 with transfer switch, 20 kW on propane) vs $383 per kW ($6,899 with transfer switch, 18 kW on propane)) and noise (65 dBA rated in normal operation vs 66 dBA rated in normal operation).
- Choose the Briggs & Stratton PowerProtect+ 18kW for warranty (7-year warranty vs 5-year warranty).
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 | Cummins Quiet Connect RS20AC 20kW | Briggs & Stratton PowerProtect+ 18kW |
|---|---|---|
| Overall rating | 3.2/5 | 3.2/5 |
| Value 35% | 28 $333 per kW ($6,662 with transfer switch, 20 kW on propane) | 7 $383 per kW ($6,899 with transfer switch, 18 kW on propane) |
| Transfer switch 15% | 100 includes a 200 A transfer switch | 100 includes a 200 A transfer switch |
| Noise 15% | 58 65 dBA rated in normal operation | 50 66 dBA rated in normal operation |
| Power quality 10% | 83 under 5% THD | 83 under 5% THD |
| Warranty 25% | 29 5-year warranty | 57 7-year warranty |
Specifications
| Cummins Quiet Connect RS20AC 20kW | Briggs & Stratton PowerProtect+ 18kW | |
|---|---|---|
| Output | ||
| Rated output, propane | 20 kW | 18 kW |
| Rated output, natural gas | 18 kW | 18 kW |
| THD | Under 5% | Under 5% |
| Engine | 999 cc | 993 cc |
| Engine speed | 3,600 rpm | 3,600 rpm |
| Install | ||
| Transfer switch | Included, 200 A | Included, 200 A |
| Load management | No | No |
| Remote monitoring | Yes | Yes |
| Enclosure | Aluminum | Aluminum |
| Dimensions | 34.1 x 36.0 x 27.3 in | 46 x 27 x 28 in |
| Weight | 596 lb | 490 lb |
| Noise and warranty | ||
| Noise, normal operation | 65 dBA | 66 dBA |
| Noise, weekly self-test | - | 62 dBA |
| Warranty | 5 years | 7 years |
| Released | - | 2026-05 |