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10 Best Whole House Generators 2025 in the United States
#1
Winner
Generac Guardian 24kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
The Generac 7210 24kW Air Cooled Guardian Series Home Standby Generator is designed to offer reliable power for residential use during outages. With a noteworthy power output of 24,000 watts, it ensures that even larger homes can stay powered, making it a strong candidate for whole-house protection. One of its standout features is the 200-amp automatic transfer switch, which ensures seamless power switching, allowing for uninterrupted service during outages. Additionally, the Smart Controls and Mobile Link Wi-Fi connectivity enable users to monitor the generator’s performance remotely, which is a big plus for peace of mind.
Rating
10.0
Chosen by1,131
Power Output (Wattage)
Automatic Transfer Switch (ATS)
Noise Level
Most important from
429 reviews
#2
Westinghouse 14500 Peak Watt Tri-Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas, Propane, and Natural Gas Powered
The Westinghouse 14500 Peak Watt Tri-Fuel Home Backup Portable Generator is a versatile option for those looking for a reliable backup power source for larger homes. One of its significant strengths is the tri-fuel capability, allowing it to run on gasoline, propane, or natural gas, which provides flexibility based on availability and cost of fuel. With a peak wattage of 14,500 watts on gasoline and a running wattage of 11,500 watts, it can handle substantial power loads.
Rating
10.0
Fuel Type
Run Time
Most important from
1642 reviews
#3
Generac Guardian 22kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
The Generac 7043 22kW Air Cooled Guardian Series Home Standby Generator stands out as a solid option for anyone looking to ensure their home has reliable power during outages. Its impressive 22,000 watts of power output means it can support most home appliances, making it suitable for residential use. The generator runs on natural gas or LP gas, offering flexibility in fuel choice, which is a strong point for varied household needs.
Rating
10.0
Power Output (Wattage)
Automatic Transfer Switch (ATS)
Size and Installation
Most important from
429 reviews
Top 10 Best Whole House Generators 2025 in the United States
#1
Winner
10.0 score
Generac Guardian 24kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
Generac Guardian 24kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
Power Output (Wattage): 24000 watts
Fuel Type: Natural Gas or LP Gas
Automatic Transfer Switch (ATS): 200-amp transfer switch
Size and Installation: 48"L x 25"W x 25"H, 455 lbs
Chosen by 1131 this week
Westinghouse 14500 Peak Watt Tri-Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas, Propane, and Natural Gas Powered
Westinghouse 14500 Peak Watt Tri-Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas, Propane, and Natural Gas Powered
Power Output (Wattage): 14500 Peak, 11500 Running
Fuel Type: Gasoline, Natural Gas, LPG
Run Time: 19h gasoline, 7h propane
Automatic Transfer Switch (ATS): Transfer switch ready
Size and Installation: 27.2"L x 26.1"W x 26.5"H
Generac Guardian 22kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
Generac Guardian 22kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
Power Output (Wattage): 22000 watts
Fuel Type: Natural Gas or LP Gas
Automatic Transfer Switch (ATS): 200-amp automatic switch
Size and Installation: 466 pounds, professional installation
Generac Guardian 18kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
Generac Guardian 18kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
Power Output (Wattage): 18000
Fuel Type: Natural Gas or LP Gas
Automatic Transfer Switch (ATS): Yes
Size and Installation: 25"L x 48"W x 29"H, 420 lbs
DuroMax XP15000HX 15,000-Watt Dual Fuel Portable Generator - Gas & Propane, Remote Electric Start, Whole Home Power Backup, Transfer Switch Ready, RV & Emergency Ready
DuroMax XP15000HX 15,000-Watt Dual Fuel Portable Generator - Gas & Propane, Remote Electric Start, Whole Home Power Backup, Transfer Switch Ready, RV & Emergency Ready
Power Output (Wattage): 15000
Fuel Type: Gasoline, LPG
Automatic Transfer Switch (ATS): Yes
Size and Installation: 38"L x 28"W x 33"H
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Generac Guardian 26kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
Generac Guardian 26kW Home Standby Generator with 200 Amp Transfer Switch, Durable All Aluminum, WiFi Enabled with G-Force Engine, Easy to Use, Whole House Power Backup, Smart Outage Solution - Bisque
Power Output (Wattage): 26000 watts
Fuel Type: Natural or LP Gas
Run Time: 12 minutes
Automatic Transfer Switch (ATS): 200 Amp
Size and Installation: 48.5"L x 25.1"W x 28.6"H; licensed electrician
DuroMax XP13000E 13,000-Watt Gas Powered Portable Generator - Electric Start, Whole Home Backup Power, Transfer Switch Ready, RV & Emergency Ready
DuroMax XP13000E 13,000-Watt Gas Powered Portable Generator - Electric Start, Whole Home Backup Power, Transfer Switch Ready, RV & Emergency Ready
Power Output (Wattage): 13000 starting, 10500 running watts
Fuel Type: Gasoline
Automatic Transfer Switch (ATS): Compatible with transfer switches
Size and Installation: 29"L x 30"W x 26"H; easy install
Westinghouse 28000 Peak Watt Home Backup Portable Generator, Remote Electric Start with Auto Choke, Transfer Switch Ready 30A & 50A Outlets, Gas Powered, CO Sensor,Blue
Westinghouse 28000 Peak Watt Home Backup Portable Generator, Remote Electric Start with Auto Choke, Transfer Switch Ready 30A & 50A Outlets, Gas Powered, CO Sensor,Blue
Power Output (Wattage): 28000 watts
Fuel Type: Gasoline
Run Time: 11 hours
Size and Installation: 39.5"L x 27.3"W x 40.2"H
Champion Power Equipment 15,000-Watt Electric Start Tri Fuel Home Backup Portable Generator with CO Shield
Champion Power Equipment 15,000-Watt Electric Start Tri Fuel Home Backup Portable Generator with CO Shield
Power Output (Wattage): 12000 watts
Fuel Type: Gasoline, Propane, Natural Gas
Run Time: 9 hours
Noise Level: 78 dBA
Size and Installation: 33"L x 33.7"W x 33.1"H
#10
8.9 score
Kohler 26RCAL-200SELS Air-Cooled Standby Generator with 200 Amp Transfer Switch Single Phase, 26,000-Watt
Kohler 26RCAL-200SELS Air-Cooled Standby Generator with 200 Amp Transfer Switch Single Phase, 26,000-Watt
Power Output (Wattage): 26000
Fuel Type: Gasoline, Natural Gas, Propane
Automatic Transfer Switch (ATS): 200 amp
Size and Installation: 47"L x 26"W x 32"H
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Buying Guide for the Best Whole House Generators
Choosing the right whole-house generator is crucial to ensure that your home remains powered during outages. A whole-house generator can provide peace of mind by keeping your essential appliances and systems running smoothly. When selecting a generator, it's important to consider several key specifications to ensure you get the best fit for your needs. Understanding these specifications will help you make an informed decision and choose a generator that meets your power requirements and preferences.Power Output (Wattage)Power output, measured in watts (W), indicates how much electricity the generator can produce. This is important because it determines how many and which types of appliances and systems you can run simultaneously. Generators typically range from 5,000 to 20,000 watts or more. For small homes or essential circuits, a generator with 5,000 to 7,500 watts may suffice. Medium-sized homes might need 10,000 to 15,000 watts, while larger homes with multiple high-power appliances may require 20,000 watts or more. Assess your power needs by listing essential devices and their wattage to choose the right generator.
Fuel TypeWhole-house generators can run on various fuel types, including natural gas, propane, and diesel. The fuel type affects the generator's efficiency, cost, and convenience. Natural gas is often preferred for its continuous supply and lower emissions, making it a good choice for homes with a natural gas line. Propane is a clean-burning alternative that can be stored in large tanks, suitable for areas without natural gas access. Diesel generators are known for their durability and efficiency but may require more maintenance. Choose a fuel type based on availability, storage, and your environmental preferences.
Run TimeRun time refers to how long a generator can operate on a full tank of fuel or continuous fuel supply. This is important for ensuring that your home remains powered during extended outages. Generators with longer run times reduce the need for frequent refueling or maintenance. Run times can vary widely, with some generators capable of running for 24 hours or more on a single tank. Consider your typical outage duration and choose a generator with a run time that matches your needs to avoid interruptions.
Automatic Transfer Switch (ATS)An Automatic Transfer Switch (ATS) is a device that automatically switches the power supply from the grid to the generator during an outage. This is important for convenience and safety, as it ensures a seamless transition without manual intervention. ATS systems can vary in their capabilities, with some offering advanced features like load management and remote monitoring. For most homeowners, a basic ATS that provides automatic switching will suffice. However, if you have specific power management needs or want added convenience, consider a more advanced ATS.
Noise LevelNoise level, measured in decibels (dB), indicates how loud the generator will be during operation. This is important for maintaining a comfortable living environment and adhering to local noise regulations. Generators can range from 50 dB (similar to a quiet conversation) to over 80 dB (similar to a lawnmower). If noise is a concern, look for generators with lower decibel ratings or those designed with noise-reducing features. Consider the placement of the generator and choose a model that balances power output with acceptable noise levels for your home.
Size and InstallationThe size and installation requirements of a whole-house generator are important for ensuring it fits within your available space and complies with local codes. Generators come in various sizes, and larger units may require more space and specific installation considerations. Professional installation is often recommended to ensure safety and proper operation. Assess the available space around your home and consult with a professional to determine the best location and installation requirements for your chosen generator. This will help you avoid potential issues and ensure a smooth setup process.