10 Best Diesel Generators 2025 in the United States

The Generac Guardian 22kW Home Standby Generator is a powerful option for homeowners seeking reliable backup power during outages. It delivers a strong 22,000 watts of clean and stable electricity, enough to cover an entire house comfortably. Its engine is designed to be fuel-efficient and quieter than many comparable generators, which helps reduce noise disturbance during use. The unit runs on natural gas or propane, which are convenient and readily available fuel sources for many users.

One standout feature is the included 200 Amp automatic transfer switch, which seamlessly switches your home’s power to the generator when the main power goes out—meaning you won’t have to lift a finger during an outage. The transfer switch is also built to last with a five-year warranty and is housed in a weatherproof aluminum enclosure for outdoor installation. The generator comes Wi-Fi enabled, allowing you to monitor its status and maintenance alerts remotely via an app, providing extra convenience and peace of mind.

In terms of size and weight, it’s a heavier and less portable unit (466 pounds), so it’s best suited for permanent home installation rather than moving around. Maintenance needs are relatively low thanks to the durable G-Force engine, but professional installation and occasional servicing by a licensed electrician are recommended to keep it running smoothly. Though this generator is on the pricier side and installation can be involved, its combination of power, reliability, and smart features makes it an excellent choice for homeowners wanting a dependable whole-house backup power solution.

The maXpeedingrods 4000 Watt Dual Fuel Inverter Generator is designed for users who need a reliable power source for camping, RVs, or home backup during emergencies. Its dual fuel capability allows it to run on both gasoline and propane, providing flexibility in fuel choice. The generator is lightweight at 52.9 pounds, making portability easier for outdoor adventures or moving it around the home. With a noise level of just 58-60 decibels, it operates quietly—similar to a normal conversation—making it suitable for use in residential areas without disturbing neighbors.

One of its standout features is the Bluetooth app remote control, which allows users to monitor vital information like power output and fuel level, adding convenience for those who prefer modern technology. It also comes with an electric start feature, which can be a significant advantage for users who want a hassle-free startup.

The generator's power output of 4000 watts is adequate for many uses, though it may not be sufficient for larger appliances or extended use. The 13-hour runtime is decent at 25% load but may require refueling during longer outings. Additionally, while the dual-fuel feature is advantageous, users should consider the availability of both fuel types depending on their location, especially during emergencies.

The Westinghouse Outdoor Power Equipment 14500 Peak Watt Tri-Fuel Home Backup Portable Generator is a versatile option for homeowners needing reliable backup power. With a peak output of 14,500 watts and a running output of 11,500 watts on gasoline, it provides ample power for larger homes or for outdoor activities. The flexibility to use gasoline, propane, or natural gas makes it a tri-fuel generator, allowing users to choose the most convenient or economical fuel option. Its impressive run time of up to 19 hours on a full tank makes it suitable for extended outages, which is a significant advantage for those in areas prone to power interruptions.

Portability is another strong point, though weighing in at 230 pounds, it might require some effort to transport. The built-in electric start feature is user-friendly, enhancing convenience, especially during emergencies. The generator also includes an automatic transfer switch (ATS) readiness, which allows for seamless power transfer, making it easier to use during outages.

On the downside, the noise level during operation might be a concern for some users, particularly in quiet neighborhoods. While it’s fairly quiet for a generator, it's still advisable to check local noise ordinances if you plan to use it frequently. Maintenance is manageable, given the durable 550cc engine; however, like all generators, it will require regular upkeep to ensure longevity.