Cummins
Cummins QuietConnect RS20A
The RS20A is what owners buy when the nightly drone of a 70 dB generator is a dealbreaker: Cummins holds it to 65 dB at 23 feet — dishwasher territory — while still starting a 5-ton air conditioner and managing four loads with its built-in intelligent load control. The same QSJ999G V-twin as the RS13A runs harder here, delivering 20kW on propane and 18kW on natural gas, and it ships cold-weather-ready to 0°F out of the box. Owner reviews read like Kohler's best: uneventful, reliable, quiet enough that neighbors ask if it's running. The trade-offs also mirror the RS13A — sparse residential dealer coverage makes pre-purchase service planning essential, stock frequently slips to pre-order, and the app is functional but bare-bones. For sound-sensitive neighborhoods it's arguably the class benchmark.
Specifications
Highlights
Pros
- ✓Best-in-class 65 dB noise at full 20kW output
- ✓Integrated load management controls four loads without extra modules
- ✓Starts a 5-ton AC while carrying the house
- ✓Cold-weather ready to 0°F with no added kit
- ✓Cummins commercial engineering and 5-year/2,000-hour warranty
- ✓18-inch NFPA clearance for tight installs
Cons
- ✗Thin dealer network — warranty service can mean long waits
- ✗Often pre-order/backordered at major retailers
- ✗18kW natural gas derate
- ✗App monitoring trails Generac's polish
- ✗Extended-warranty and accessory pricing runs high
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Cummins QuietConnect RS13A
The sleeper value in home standby: a genuine Cummins — the company that powers hospitals and data centers — at a price under the equivalent Generac or Kohler. The RS13A's QSJ999G 999cc V-twin was designed in-house for gaseous fuel, and the QuietConnect sound-insulated enclosure holds it to 65 dB at 23 feet, quieter than most competitors' smaller units. It holds 13kW on either natural gas or propane with no derate, meets the 18-inch NFPA 37 clearance for tight lots, and owners consistently describe installs that just work. The catch, and it's the one that dominates owner threads: the Cummins residential dealer network is sparse compared to Generac's. If there's no certified servicer within reasonable distance, warranty work becomes your problem. The Cummins app covers status and alerts but is basic.
Generac
Generac Guardian 22kW
For years the best-selling home standby generator in America, and the sheer volume of owner reviews shows why: the 22kW carries most whole homes — two AC units with load management — and every electrician and gas fitter in the country has installed one. The G-Force 1000 engine and 67 dB noise level are unremarkable but proven; owners report units sailing through week-long outages after hurricanes. The flip side of ubiquity is that the complaint threads are equally deep: Evolution controller replacements, dealers backlogged after storms, and Generac support that owners describe as polite but powerless. The newer 24kW (7209/7210) has largely replaced it at similar money, but the 7042 remains widely stocked, slightly cheaper, and the known quantity — a big deal when your installer has done fifty of them.
Briggs & Stratton
Briggs & Stratton PowerProtect 22kW
Briggs' PowerProtect 22kW has one spec nobody else in the class matches: NGMax tuning delivers the full 22,000 watts on natural gas — no derate — where Generac's 22kW drops to 19.5kW and Kohler's 20kW to 18kW. If your home runs on NG, that's effectively a size-class upgrade for free. The commercial-grade Vanguard 993cc V-twin (Briggs' premium engine line) drives it, the aluminum enclosure is rated for 186-mph hurricane winds, and the 7-year parts/labor/travel warranty beats the standard 5-year offers. So why isn't it everywhere? Owner threads point to the thin dealer network, slower parts distribution since Briggs' 2020 bankruptcy and KPS acquisition, and low retail visibility — Lowe's is the main storefront. At 68 dBA normal / 64 dBA idle-mode it's mid-pack for noise.