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The Generac 7257 10 kW Standby Generator is a compact yet powerful solution for safeguarding your home’s most essential systems during a power outage. With its robust design and innovative technology, this generator ensures reliable performance that automatically activates when utility power fails. Designed for both propane and natural gas operation, it gives homeowners the flexibility to choose the fuel source that best fits their environment and budget.
Engineered with Generac’s G-Force engine, the 7257 is built specifically to withstand extended run times and high-demand conditions. Unlike modified off-the-shelf engines, this purpose-built design delivers durability and reduced maintenance requirements. Coupled with True Power™ electrical technology, the generator provides clean, stable power with less than 5% total harmonic distortion—ideal for sensitive electronics, appliances, and HVAC systems.
Ease of use and monitoring are at the forefront with Generac’s Evolution™ controller. The two-line multilingual LCD display (English, Spanish, French, Portuguese) offers system status, maintenance intervals, and intuitive controls. Built-in Wi-Fi connectivity allows you to monitor your generator from anywhere using a smartphone or computer. Additionally, its Quiet-Test™ self-diagnostic mode runs at a lower RPM, saving fuel and operating more quietly while ensuring your generator is always prepared.
Practical installation and peace of mind round out the package. The sound-attenuated aluminum enclosure features a corrosion-resistant finish for long life and can be installed as close as 18 inches from your home (subject to code requirements). Backed by a 5-year limited warranty and certifications through trusted third-party testing, the Generac 7257 offers homeowners a complete backup solution they can trust when it matters most.
Key Features:
Standby power rating: 10 kW (propane), 9 kW (natural gas)
Powered by Generac’s G-Force engine, designed for extended run times and reliability
True Power™ technology ensures <5% total harmonic distortion for sensitive electronics
Evolution™ Controller with two-line multilingual LCD (English, Spanish, French, Portuguese)
Standard Wi-Fi® connectivity for remote monitoring and management
Quiet-Test™ low-RPM self-test mode reduces fuel consumption and noise
Two transfer switch options: 100 A 16-circuit or 200 A service-rated smart switch
Sound-attenuated aluminum enclosure with corrosion-resistant finish
Listed for installation as close as 18 inches from structures (with code compliance)
Integrated safety protections: electronic governor, system status LEDs, automatic shutdowns
Natural gas or propane fuel flexibility with included flexible fuel line connector
Backed by a 5-year limited warranty for long-term peace of mind
Fuel Type: Liquid Propane or Natural Gas
Oil Type:
Oil Capacity (qt): 1.1
Oil Filter P/N:
Air Filter P/N:
Spark Plug P/N:
Battery Included:
Battery PN:
Battery Type: Group 26R 540 CCA Minimum or Group 35AGM 650 CCA Minimum
Battery Size: 12V
Engine Type: G-Force 400
Engine Size (Liters):
Weight (lb): 338
Running Watts (W) 10,000
Mobile Link:
Quiet Test:
Length (in): 48
Width (in): 25
Height (in): 29
Controller Type: Evolution
Enclosure: Aluminum
Max. Cont. Power (LP): 0
Max. Cont. Power (NG): 9,000
Rated maximum continuous power capacity - Liquid Propane Operation (kW): 0
Rated maximum continuous power capacity - Natural Gas Operation (kW): 0
Main Line Circuit Breaker 45
NG Consumption - 50% (ft3/hr): 101
NG Consumption - 100% (ft3/hr): 127
LP Consumption - 50% (ft3/hr): 36
LP Consumption - 50% (gal/hr): 0.97
LP Consumption - 100% (ft3/hr): 54
LP Consumption - 100% (gal/hr): 1.48
LP Fuel Pressure Requirement (wc): 0
Ships within 48 hours · Estimated delivery Aug 19 - Aug 24
US$40
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