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| Model Number | QT02016 | QT02516 | QT03524 | QT04524 |
| Rated Power LP (kW) | 20 | 25 | 35 | 45 |
| Rated Power NG (kW) | 20 | 25 | 35 | 43 |
| Amps @ 208V, 3Ø | 70 | n/a | 122 | 156 |
| Amps @ 480V, 3Ø | n/a | n/a | 53 | 68 |
| Voltage @ 60 Hz | 120/208 | 120/208 | 120/208, 277/480 | 120/208, 277/480 |
| Phase | Three | Three | Three | Three |
| Frequency | 60 Hz | 60 Hz | 60 Hz | 60 Hz |
| Engine/Alternator RPM | 3600/3600 | 3600/3600 | 3600/3600 | 3600/3600 |
| Engine | 1.6L OHC 4 cyl. | 1.6L OHC 4 cyl. | 2.4L OHC 4 cyl. | 2.4L OHC 4 cyl. |
| Fuel Consumption LP (cu.ft./hr.)/(gal./hr.) |
125 (3.44) | 175 (4.81) | 222.3 (6.1) | 286 (7.86) |
| Fuel Consumption NG (cu.ft./hr.) | 315 | 437 | 560 | 720 |
| EPA/CARB Certified | Yes | Yes | Yes | Yes |
| Fuel | Natural Gas LP Vapor |
Natural Gas LP Vapor |
Natural Gas LP Vapor |
Natural Gas LP Vapor |
| Engine Cooling | Liquid | Liquid | Liquid | Liquid |
| Controls | R-Series | R-Series | R-Series | R-Series |
| UL 2200 (US and Canada) | Yes | Yes | Yes | Yes |
| Sound Output dB(A) at 23 ft. with generator operating at full load | 72 | 73 | 71 | 72 |
| Sound Output dB(A) at 23 ft. with generator in WhisperTest™ low speed exercise mode | 62 | 63 | 57 | 58 |
| Main Line Circuit Breaker | 80 Amp | 100 Amp | 150, 60 Amp | 175, 80 Amp |
| Aluminum Enclosure Option | Yes | Yes | Yes | Yes |
| Dimensions (L" x W" x H") | 71 x 29.5 x 36 | 71 x 29.5 x 36 | 77 x 33.5 x 45 | 77 x 33.5 x 45 |
| Unit Wt. (lbs.) (steel/aluminum) | 784/694 | 794/704 | 1393/1276 | 1414/1297 |