Champion aXis 14kW with 200A ATS (100837) vs Kohler 12RESV 12kW
The Champion aXis 14kW with 200A ATS (100837) is the more powerful unit: 14,000 running watts against 12,000 — about 14% more capacity for the Champion aXis 14kW with 200A ATS (100837). The Champion aXis 14kW with 200A ATS (100837) is the quieter of the two (62 dBA vs 69 dBA — though manufacturers measure noise at different loads and distances). Warranty favors the Champion aXis 14kW with 200A ATS (100837): 10 years vs 5.
| Champion aXis 14kW with 200A ATS (100837) | Kohler 12RESV 12kW | |
|---|---|---|
| Price (MSRP) | — | $4,283 |
| Type | home-standby | home-standby |
| Fuel | natural-gas, propane | natural-gas, propane |
| Running watts (gas / LP for standby) | 14000 W | 12000 W |
| Running watts (propane) | 14000 W | 12000 W |
| Running watts (natural gas) | 12500 W | 11000 W |
| Noise level | 62 dBA | 69 dBA |
| Output voltage | 120/240V | 120/240V |
| Automatic transfer switch included | Yes | No |
| Main-line circuit breaker | 65 A | 60 A |
| Start type | automatic | automatic |
| Engine | Champion Milwaukee Series V-Twin | Kohler KT725 |
| Engine displacement | 754 cc | 725 cc |
| NG use at half load | — | 128 ft³/h |
| Weight | — | 433 lb |
| Warranty | 10 yr | 5 yr |
Frequently asked questions
Which is more powerful, the Champion aXis 14kW with 200A ATS (100837) or the Kohler 12RESV 12kW?
The Champion aXis 14kW with 200A ATS (100837), at 14,000 running watts on its best fuel versus 12,000 W. Remember that dual-fuel and natural-gas ratings are lower than gasoline ratings — the comparison table shows the published per-fuel figures.
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.