10 Best Diesel Generators 2026 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 DuroMax XP16000iHT is a powerful tri-fuel portable inverter generator delivering up to 16,000 watts of clean, stable power, suitable for whole-home backup, RVs, or job sites. It stands out with its ability to run on gasoline, propane, or natural gas, offering great fuel flexibility depending on your availability and preference. With dual 50-amp outlets, it easily supports full home power through a transfer switch, which is ideal for emergency backup situations. The remote electric start is a convenient feature, allowing you to start or stop the generator without going outside, especially useful during bad weather.

In terms of noise, this model uses inverter technology to keep sound levels relatively low, making it quieter than traditional generators and suitable for residential use and outdoor events. The included CO Alert safety feature adds peace of mind by automatically shutting off the unit if harmful carbon monoxide is detected. While it weighs 505 pounds, which makes portability a bit challenging, it is still considered portable for a generator of this size due to its design and wheels.

The 10.5-gallon fuel tank supports extended runtime, but exact fuel consumption rates depend on the fuel type used and load, which users should monitor via the smart digital control center. Its heavy-duty 744cc DuroMax engine is designed for durability and consistent performance. Maintenance is simplified with included tools and easy fuel switching, but the large size and weight mean periodic professional servicing may be needed. This generator suits those needing a reliable, high-power backup source with fuel flexibility and modern convenience features like remote start and digital monitoring. For those prioritizing maximum portability or extremely quiet operation, other lighter or quieter models may be preferable. The 5-year warranty also provides confidence for long-term use.

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.