Kohler 10RESV 10kW vs Kohler 12RESV 12kW
The Kohler 12RESV 12kW is the more powerful unit: 12,000 running watts against 10,000 — about 17% more capacity for the Kohler 12RESV 12kW.
| Kohler 10RESV 10kW | Kohler 12RESV 12kW | |
|---|---|---|
| Price (MSRP) | $3,834 | $4,283 |
| Type | home-standby | home-standby |
| Fuel | natural-gas, propane | natural-gas, propane |
| Running watts (gas / LP for standby) | 10000 W | 12000 W |
| Running watts (propane) | 10000 W | 12000 W |
| Running watts (natural gas) | 9000 W | 11000 W |
| Noise level | 69 dBA | 69 dBA |
| Output voltage | 120/240V | 120/240V |
| Automatic transfer switch included | No | No |
| Main-line circuit breaker | 50 A | 60 A |
| Start type | automatic | automatic |
| Engine | Kohler KT725 | Kohler KT725 |
| Engine displacement | 725 cc | 725 cc |
| NG use at half load | 120 ft³/h | 128 ft³/h |
| Weight | 428 lb | 433 lb |
| Warranty | 5 yr | 5 yr |
Frequently asked questions
Which is more powerful, the Kohler 10RESV 10kW or the Kohler 12RESV 12kW?
The Kohler 12RESV 12kW, at 12,000 running watts on its best fuel versus 10,000 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 Kohler 10RESV 10kW or the Kohler 12RESV 12kW?
Estimated fuel for 24 hours at about 50% load: $43 on natural gas for the Kohler 10RESV 10kW vs $46 on natural gas for the Kohler 12RESV 12kW, 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.