Generac Guardian 22kW vs Cummins QuietConnect RS20A
Quick take: The Cummins QuietConnect RS20A costs $73 less; the Generac Guardian 22kW puts out more sustained power (22,000W); the Cummins QuietConnect RS20A is quieter at 65 dB.
| Spec | Generac Guardian 22kW | Cummins QuietConnect RS20A |
|---|---|---|
| Price | $5,999 | $5,926 |
| Rating | 4.7★ (9,200) | 4.7★ (200) |
| Type | Home Standby Generator | Home Standby Generator |
| Fuel | NG/LP | NG/LP |
| Running / Output Watts | 22,000W | 20,000W |
| Starting / Surge Watts | 22,000W | 20,000W |
| Battery Capacity | — | — |
| Expandable To | — | — |
| Noise | 67 dB | 65 dB |
| Runtime | Continuous (runs on home NG/LP supply); 22kW on LP, 19.5kW on NG | Continuous (runs on home NG/LP supply); 20kW on LP, 18kW on NG |
| Outlets | None — hardwired via automatic transfer switch (7043 bundle adds 200A SE switch) | None — hardwired via automatic transfer switch (RS20AC bundle adds 200A SE switch) |
| Fuel Tank | — | — |
| Weight | 466 lbs | 540 lbs |
| Transfer-switch ready | Yes | Yes |
| Warranty | 5-year limited | 5-year/2,000-hour limited |
Pros & cons
Generac Guardian 22kW
- ✓Enormous installed base — parts, techs, and advice everywhere
- ✓Carries two AC units in most homes with load shedding
- ✓Often discounted now that the 24kW is the flagship
- ✓<5% THD safe for sensitive electronics
- ✓5-year warranty with widely available extended options
- ✓Proven multi-week hurricane performance in owner reports
- ✗19.5kW on natural gas — the derate matters for NG homes
- ✗67 dB is noticeably loud up close; siting matters
- ✗Evolution controller remains the top failure item in owner forums
- ✗Post-storm dealer backlogs can leave you waiting for warranty work
- ✗Being phased out in favor of the 24kW — long-term parts pricing unknown
Cummins QuietConnect RS20A
- ✓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
- ✗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