15 40–45 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 |
|---|---|---|---|---|---|
| MTU 4R0063 GS40 | 40.0 kW | 3 | 69.9 dBA | 544.0 kg | — |
| Generac QT040 | 40.0 kW | Single/Three | 73.0 dBA | — | — |
| Wincogen PSS40-3 | 40.0 kW | Single Phase,Three Phase | — | — | — |
| Wincogen PSS40-4 | 40.0 kW | Single Phase,Three Phase | — | — | — |
| Wincogen PSS40-17 | 40.0 kW | Single Phase,Three Phase | — | — | — |
| Wincogen PSS40-18 | 40.0 kW | Three Phase | — | — | — |
| Katolight 40FRG4 | 40.0 kW | 3 | 77.0 dBA | 396.0 kg | — |
| Katolight 40FPG4 | 40.0 kW | 3 | — | — | — |
| Katolight 40FJG4 | 40.0 kW | 3 | — | — | — |
| Katolight 40FNG4 | 40.0 kW | 3 | — | — | — |
| Katolight 40FGG4 | 40.0 kW | 1 | — | — | — |
| Katolight 40FDG4 | 40.0 kW | 1 | — | — | — |
| Kohler 45ERES | 41.0 kW | — | — | — | — |
| Kohler 45REZG | 41.0 kW | — | — | — | — |
| Kohler 50RZGB-RES | 44.0 kW | 1 | 71.0 dBA | 1021.0 kg | — |
Among 40–45 kW Natural Gas generators in this comparison, the MTU 4R0063 GS40 is quietest at 69.9 dBA.
Among 40–45 kW Natural Gas generators in this comparison, the Katolight 40FRG4 is lightest at 396.0 kg dry weight.
Not every model reports every spec — blanks mean the source document didn't state that figure, not that the value is zero.