Champion aXis 14kW with 200A ATS (100837) vs Generac Guardian 20kW (7039)
The Generac Guardian 20kW (7039) is the more powerful unit: 20,000 running watts against 14,000 — about 30% more capacity for the Generac Guardian 20kW (7039). The Champion aXis 14kW with 200A ATS (100837) is the quieter of the two (62 dBA vs 67 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) | Generac Guardian 20kW (7039) | |
|---|---|---|
| Type | home-standby | home-standby |
| Fuel | natural-gas, propane | natural-gas, propane |
| Running watts (gas / LP for standby) | 14000 W | 20000 W |
| Running watts (propane) | 14000 W | 20000 W |
| Running watts (natural gas) | 12500 W | 18000 W |
| Noise level | 62 dBA | 67 dBA |
| Output voltage | 120/240V | 120/240V |
| Automatic transfer switch included | Yes | Yes |
| Main-line circuit breaker | 65 A | 90 A |
| Start type | automatic | automatic |
| Engine | Champion Milwaukee Series V-Twin | Generac G-Force 1000 |
| Engine displacement | 754 cc | 999 cc |
| NG use at half load | — | 204 ft³/h |
| Propane use at half load | — | 2.37 gal/h |
| Weight | — | 448 lb |
| Warranty | 10 yr | 5 yr |
Frequently asked questions
Which is more powerful, the Champion aXis 14kW with 200A ATS (100837) or the Generac Guardian 20kW (7039)?
The Generac Guardian 20kW (7039), at 20,000 running watts on its best fuel versus 14,000 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.