Generac Guardian 20kW (7039) vs Generac Guardian 26kW (7290)
The Generac Guardian 26kW (7290) is the more powerful unit: 26,000 running watts against 20,000 — about 23% more capacity for the Generac Guardian 26kW (7290).
| Generac Guardian 20kW (7039) | Generac Guardian 26kW (7290) | |
|---|---|---|
| Type | home-standby | home-standby |
| Fuel | natural-gas, propane | natural-gas, propane |
| Running watts (gas / LP for standby) | 20000 W | 26000 W |
| Running watts (propane) | 20000 W | 26000 W |
| Running watts (natural gas) | 18000 W | 22500 W |
| Noise level | 67 dBA | 67 dBA |
| Output voltage | 120/240V | 120/240V |
| Automatic transfer switch included | Yes | No |
| Main-line circuit breaker | 90 A | 110 A |
| Start type | automatic | automatic |
| Engine | Generac G-Force 1000 | Generac G-Force 1000 |
| Engine displacement | 999 cc | 999 cc |
| NG use at half load | 204 ft³/h | 188 ft³/h |
| Propane use at half load | 2.37 gal/h | 2.06 gal/h |
| Weight | 448 lb | 518 lb |
| Warranty | 5 yr | 5 yr |
Frequently asked questions
Which is more powerful, the Generac Guardian 20kW (7039) or the Generac Guardian 26kW (7290)?
The Generac Guardian 26kW (7290), at 26,000 running watts on its best fuel versus 20,000 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 Generac Guardian 20kW (7039) or the Generac Guardian 26kW (7290)?
Estimated fuel for 24 hours at about 50% load: $73 on natural gas for the Generac Guardian 20kW (7039) vs $67 on natural gas for the Generac Guardian 26kW (7290), 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.