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Generac 10 kW home standby generator
The Short AnswerThe Generac 10 kW air-cooled home standby generator (model 7257) is rated at 10 kW on propane and 9 kW on natural gas. The smallest size we install in the lineup we install. Southern Power Generators installs it with an automatic transfer switch across metro Atlanta, and James Hill, a licensed Master Electrician, confirms it's the right size for your home first.
10 kWon propane
9 kWon natural gas
61 dBAat 23 ft, running
5 yearsGenerac limited warranty
Is it the right size?
The smallest size we install
A good match when you mainly want the essentials covered: the fridge, lights, Wi-Fi, a sump pump and similar loads.
Every home is different. The number of A/C units, electric appliances and pumps all change the answer, so James confirms the size on a free site visit before you decide.
| Generac model | 7257 (generator) |
| Rated output, propane | 10 kW |
| Rated output, natural gas | 9 kW |
| Engine | Generac G-Force 400, 459 cc |
| Sound at 23 ft, normal operation | 61 dBA |
| Sound at 23 ft, quiet weekly test | 49 dBA |
| Size (L x W x H) | 46.4 x 26.3 x 30.7 in |
| Weight | About 344 lb |
| Fuel use at full load | 132 cu ft/hr natural gas · 1.60 gal/hr propane |
| Monitoring | Cellular connectivity with Generac's Mobile Link app |
| Generac warranty | 5-year limited |
Specs from Generac's air-cooled standby generator spec sheets (Rev D, August 2026). Ratings are Generac's maximum power ratings and drop at high temperatures and altitudes. Generac may update its specs, so check Generac's site for the latest. See it on Generac.com.
Questions about the 10 kW
Your generator questions, answered
What can a 10 kW generator run?
A good match when you mainly want the essentials covered: the fridge, lights, Wi-Fi, a sump pump and similar loads. The real answer depends on your home, so James sizes it on the free site visit.
How much does a 10 kW Generac cost installed?
Every home is different. The price depends on the generator size, how far it sits from your gas meter and electrical panel, whether you need a propane tank, any panel work, and what your permit requires. After a free site visit, James gives you a written estimate that spells out the equipment, installation and extras. No hidden fees and no pressure.
Does the 10 kW run on natural gas or propane?
Both. Generac rates it at 10 kW on propane and 9 kW on natural gas.
Does it come with a transfer switch?
Every standby generator we install comes with an automatic transfer switch, matched to your panel.
Get a generator quote
Ready before the next storm?
Tell us a little about your home and we'll call or text you to set up a free site visit.
Call or text404-593-6308
Emailjames@southernpg.com
Office2637 White Oak Dr, Decatur, GA 30032
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