Cummins QuietConnect RS25 25kW Liquid-Cooled vs Generac Guardian 26kW with 200A ATS (7291)
The Generac Guardian 26kW with 200A ATS (7291) is the more powerful unit: 26,000 running watts against 25,000 — about 4% more capacity for the Generac Guardian 26kW with 200A ATS (7291). The Cummins QuietConnect RS25 25kW Liquid-Cooled is the quieter of the two (64 dBA vs 67 dBA — though manufacturers measure noise at different loads and distances). Warranty favors the Generac Guardian 26kW with 200A ATS (7291): 5 years vs 2.
| Cummins QuietConnect RS25 25kW Liquid-Cooled | Generac Guardian 26kW with 200A ATS (7291) | |
|---|---|---|
| Type | home-standby | home-standby |
| Fuel | natural-gas, propane | natural-gas, propane |
| Running watts (gas / LP for standby) | 25000 W | 26000 W |
| Running watts (propane) | 25000 W | 26000 W |
| Running watts (natural gas) | 25000 W | 22500 W |
| Noise level | 64 dBA | 67 dBA |
| Output voltage | 120/240V | 120/240V |
| Automatic transfer switch included | No | Yes |
| Main-line circuit breaker | 125 A | 110 A |
| Start type | automatic | automatic |
| Engine | — | Generac G-Force 1000 |
| Engine displacement | 2400 cc | 999 cc |
| NG use at half load | 185.7 ft³/h | 188 ft³/h |
| Propane use at half load | 2.1 gal/h | 2.06 gal/h |
| Weight | 1109 lb | 518 lb |
| Warranty | 2 yr | 5 yr |
Frequently asked questions
Which is more powerful, the Cummins QuietConnect RS25 25kW Liquid-Cooled or the Generac Guardian 26kW with 200A ATS (7291)?
The Generac Guardian 26kW with 200A ATS (7291), at 26,000 running watts on its best fuel versus 25,000 W. Remember that dual-fuel and natural-gas ratings are lower than gasoline ratings — the comparison table shows the published per-fuel figures.
Which costs less to run, the Cummins QuietConnect RS25 25kW Liquid-Cooled or the Generac Guardian 26kW with 200A ATS (7291)?
Estimated fuel for 24 hours at about 50% load: $67 on natural gas for the Cummins QuietConnect RS25 25kW Liquid-Cooled vs $67 on natural gas for the Generac Guardian 26kW with 200A ATS (7291), at national average prices. These are spec-sheet-derived estimates — the assumptions are on the methodology page, and different fuels make this a cost comparison, not an efficiency ranking.
Where do these specifications come from?
Every record on BackupAtlas is hand-curated from manufacturer documentation and spec sheets, and each generator page links to its source document.