10 Best Whole House Generators 2025 in the United States

The Generac 15,500-Watt Portable Generator is a strong option for those wanting backup power for their entire home or large job sites. Its high power output of 15,500 running watts means it can handle multiple appliances and essential systems simultaneously. Fueled by gasoline with an efficient 816cc electronic fuel injection engine, it offers cleaner fuel use and dependable starts. The 5-gallon fuel tank provides around 11 hours of runtime, which is solid for extended outages.

Safety is addressed with built-in COsense technology that alerts users to dangerous carbon monoxide levels, adding an important layer of protection. Although it doesn’t include an automatic transfer switch (ATS) out of the box, it is compatible with transfer switches, allowing easy integration for seamless power transfer during outages. The generator is quite heavy at 450 pounds and fairly large, so it’s best suited for users who have space and can manage its size. Its rugged build with covered outlets and sturdy wheels makes it durable and easier to move than most generators this powerful.

One minor consideration is the noise level, as large gas generators like this are typically loud, which may be a factor if you have noise restrictions. This generator is a reliable, powerful choice for whole-house backup, especially if robust performance and built-in safety features are priorities, though it may require professional installation and sufficient space to operate comfortably.

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.

The installation process is straightforward, although it’s recommended to have a certified electrician set it up for safety and compliance. For peace of mind, the generator comes with a 200-amp automatic transfer switch that ensures seamless power transfer during an outage, keeping your home fully protected.

One of its standout features is the Mobile Link Wi-Fi connectivity, which allows users to monitor generator performance remotely. This is particularly beneficial for those who travel or want to keep tabs on their system without being physically present. Additionally, the 5-Year Limited Warranty reflects Generac’s confidence in the product's durability and performance.

On the downside, the generator is relatively heavy at 466 pounds, which can make installation a bit challenging if not managed properly. Additionally, as it requires professional installation, upfront costs may be higher than anticipated for some homeowners. The Generac 7043 is designed for those who prioritize reliability and ease of use in a whole-house generator, especially for residential settings. While it has some weight and installation considerations, its performance and smart features make it a worthwhile investment for maintaining power during outages.

The DuroMax XP15000HX 15,000-Watt Dual Fuel Portable Generator is a robust option for ensuring your whole house stays powered during outages. With a significant 15,000-watt output, it can handle extensive power needs, making it ideal for large homes or even commercial use. The dual fuel capability allows you to use either gasoline or propane, giving you flexibility based on availability and cost efficiency. Propane, in particular, is a cleaner and longer-lasting fuel option, which can be beneficial for maintenance and storage.

The generator includes an automatic transfer switch-ready outlet, making it convenient for seamless integration into your home's power system during an outage. The CO Alert feature is a critical safety addition, shutting down the generator if it detects harmful carbon monoxide levels. This adds a layer of safety for your household that can't be overlooked. The multiple outlets and a digital display that shows voltage, frequency, and maintenance schedules make the generator versatile and user-friendly.

There is also a push-button start and remote control for easy operation. However, the generator is quite heavy at 345 pounds, which may be cumbersome for some users despite its portability features like wheels and handles. Additionally, it operates at a noise level that might be noticeable, though this is typical for generators of this capacity. The large size and weight mean installation might require some effort and space planning. With a 5-year warranty, it offers reassurance of longevity and reliability.