by Generac
Generac Guardian 24kW
24 kW standby generator
Key specifications
- Rated output, propane
- 24 kW
- Rated output, natural gas
- 21 kW
- Fuel
- Dual fuel (NG / LP)
- Phase
- Single-phase
- MSRP (starting)
- $6,559
- Dimensions
- 48 x 25 x 29 in
- Weight
- 455 lb
- Engine displacement
- 999 cc
- Sound, running (23 ft)
- 67 dB
- Sound, exercise (23 ft)
- 57 dB
- Warranty
- 5 years
Unverifiable specs are omitted, not estimated. See sources below for what we can defend.
Fuel use
| Fuel | Half load | Full load |
|---|---|---|
| Propane | 2.53 gal/hr | 3.9 gal/hr |
| Natural gas | 203 ft³/hr | 306 ft³/hr |
On propane, a 500-gallon tank filled to 80% holds about 400 gallons. That runs the Generac Guardian 24kW for about 158 hours (6.6 days) nonstop at half load, or about 103 hours (4.3 days) at full load. See how much propane a generator uses for other tank sizes.
On natural gas, the gas line and meter have to deliver the full-load figure, 306 ft³/hr, even if the generator rarely runs that hard. Installers size the pipe to it.
Sources
Every spec above traces back to one of these citations.
- Generac product page — Standby Generator 24kW WiFi Enabled (G0072090) · checked July 2026
- Generac spec sheet: 20/22/24 kW Guardian Series · checked September 2026
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