3 35–40 kw natural gas generator models side by side — power, phase, sound level, weight and fuel tank capacity, compiled from manufacturer specification sheets.
| Model | Standby | Phase | Sound | Weight | Fuel tank |
|---|---|---|---|---|---|
| Kohler 35RZ | 38.0 kW | — | — | — | — |
| Kohler 40REZG | 39.0 kW | 3 | 69.0 dBA | — | — |
| Kohler 40ERES | 39.0 kW | 3 | 69.0 dBA | 982.0 kg | — |
Among 35–40 kW Natural Gas generators in this comparison, the Kohler 40REZG is quietest at 69.0 dBA.
Not every model reports every spec — blanks mean the source document didn't state that figure, not that the value is zero.