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10 Best Natural Gas Backup Generators 2026 in the United States

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Our Top Picks

#1

Winner

Generac Guardian 22kW Home Standby Generator with 200 Amp Transfer Switch - Automatic Whole House Backup Power for Storms, Emergencies, and Outages, WiFi Enabled, Runs on Natural Gas or Liquid Propane

Rating
10.0
Chosen by1,430
Power Output (Wattage)
Fuel Consumption

Most important from
255 reviews

Power Output (Wattage)
Delivers the power needed to cover most of the home, eliminating the limitations of smaller portable units.
Fuel Consumption
Runs efficiently on propane with a large in-ground tank, ensuring extended emergency coverage.

The Generac Guardian 22kW Home Standby Generator is a strong choice for homeowners seeking reliable whole-house backup power during outages. Its 22,000-watt output can comfortably support most residential electrical needs, ensuring essential appliances and systems keep running. The generator runs on natural gas or liquid propane, which offers flexibility depending on what fuel is available, and thanks to Generac's efficient G-Force engine and automatic idle control, it manages fuel consumption to extend run time without wasting energy.

Installation requires a certified electrician, and while the unit is sizable and weighs 466 pounds, it’s designed for outdoor placement with a durable, fully enclosed aluminum casing that reduces noise and protects internal components. The included 200 Amp Automatic Transfer Switch (ATS) automatically switches your home's power supply to the generator during an outage, making operation seamless and hands-free. Additionally, Wi-Fi connectivity allows remote monitoring, giving you easy access to status updates and maintenance alerts from anywhere.

Maintenance needs are relatively low compared to some competitors, partly due to the engine design, but regular check-ups are still advisable to keep it running smoothly. Noise levels are kept lower than older models, though some sound is inevitable given its power class. Backed by a 5-year warranty, this generator offers peace of mind for long-term use. It is well suited for homeowners wanting a dependable, automatic backup power system with smart features, though those seeking a lighter or more portable option might consider smaller models.

Rating
10.0
Chosen by1,430
Power Output (Wattage)
Fuel Consumption

Most important from
255 reviews

Power Output (Wattage)
Delivers the power needed to cover most of the home, eliminating the limitations of smaller portable units.
Fuel Consumption
Runs efficiently on propane with a large in-ground tank, ensuring extended emergency coverage.
#2

Generac 18kW Home Standby Generator for home use, built-in cellular connectivity, whole house generator for power backup

Rating
10.0
Fuel Consumption
Maintenance Requirements

Most important from
2 reviews

Fuel Consumption
Fuel consumption can be excessive, quickly depleting large propane tanks during prolonged power outages.
Maintenance Requirements
The generator requires professional installation and all necessary hookup parts are not included, which can add significant hidden costs and hassle.

The Generac 18kW Home Standby Generator is designed to provide reliable whole-house power backup during outages, delivering a solid 18,000 watts to keep essential home systems running smoothly. It features built-in cellular connectivity, allowing you to monitor and control the generator remotely through a mobile app, which is a convenient touch for staying informed about its status from anywhere. Fuel efficiency is improved thanks to electronic fuel and ignition controls that optimize consumption, potentially lowering your fuel costs and environmental impact compared to some other models. It also has features like automatic idle control and overload protection to help maintain performance and safety.

The generator is relatively large and weighs over 400 pounds, making it a permanent installation rather than a portable option. It includes an automatic transfer switch (ATS) to detect outages and switch power seamlessly, which is important for uninterrupted home use. The design considers cold weather operation with cold start support and protection against ice and snow. The unit comes with a 5-year warranty and is compatible with smart home energy systems. Noise is described as “super quiet” for its class, but as a standby generator, some sound during operation is expected.

Maintenance requirements include monitoring oil levels, with helpful sensors included to ensure readiness. This generator suits homeowners looking for a robust, automated backup power solution for their entire home, particularly if they want remote monitoring and smart energy integration, but it may require professional installation and upkeep.

Rating
10.0
Fuel Consumption
Maintenance Requirements

Most important from
2 reviews

Fuel Consumption
Fuel consumption can be excessive, quickly depleting large propane tanks during prolonged power outages.
Maintenance Requirements
The generator requires professional installation and all necessary hookup parts are not included, which can add significant hidden costs and hassle.
#3

DuroMax XP15000HXT+ 15,000 Watt Portable Tri Fuel EFI Portable Generator - 50 State Approved

The DuroMax XP15000HXT+ is a powerful portable generator designed to serve as a natural gas backup, capable of running a whole home including large appliances and central air conditioning with its 15,000 starting watts and 12,000 running watts. One of its standout features is tri-fuel technology, allowing you to run it on gasoline, propane, or natural gas, which offers great flexibility depending on your fuel availability and preferences. The electronic fuel injection (EFI) system improves fuel efficiency, helps with reliable cold starts, and reduces maintenance needs compared to traditional carbureted models.

This generator comes with a convenient electric start and includes a remote control for easier operation. It has several outlet types including household and transfer switch-ready receptacles, making it ready for various applications at home. The built-in CO sensor adds an important safety feature by detecting carbon monoxide levels.

The generator weighs 245 pounds and measures about 30 by 28 by 26 inches, so while it is portable with included wheels and handles, it isn’t lightweight or easily carried around by one person. It does not include an automatic transfer switch (ATS), so manual intervention is needed to switch power sources during an outage unless you purchase one separately. Maintenance is somewhat simplified due to EFI but still requires regular oil changes and checks like any gas-powered generator. A 5-year warranty offers good coverage and peace of mind. For those needing a strong, flexible fuel option generator to power a home during outages and who are comfortable with the size and manual setup for transfer switching, the DuroMax XP15000HXT+ represents a solid choice with excellent power output, advanced fuel technology, and safety features.

Buying Guide for the Best Natural Gas Backup Generators

Choosing the right natural gas backup generator is crucial to ensure you have a reliable power source during outages. The right generator will depend on your specific needs, including the size of your home, the essential appliances you need to power, and how long you expect to be without electricity. Here are some key specifications to consider when selecting a natural gas backup generator, along with explanations to help you make an informed decision.
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 what types of appliances you can run simultaneously. Generators typically range from 5,000 to 20,000 watts. For small homes or essential appliances, a generator with 5,000 to 7,500 watts may suffice. For larger homes or to power more appliances, consider a generator with 10,000 to 20,000 watts. Assess your power needs by listing the wattage of essential appliances and adding them up to find the right generator size for you.
Fuel ConsumptionFuel consumption refers to how much natural gas the generator uses per hour of operation. This is important for understanding the operational cost and ensuring you have a sufficient gas supply. Fuel consumption is usually measured in cubic feet per hour (cfh). Lower consumption rates are more efficient and cost-effective. To choose the right one, consider how long you expect to run the generator during an outage and ensure your natural gas supply can meet this demand.
Run TimeRun time indicates how long the generator can operate continuously before needing maintenance or refueling. This is crucial for planning during extended power outages. Generators with longer run times are more convenient and require less frequent attention. Run times can vary from a few hours to several days. Choose a generator with a run time that matches the typical duration of power outages in your area and your ability to perform maintenance.
Noise LevelNoise level, measured in decibels (dB), indicates how loud the generator is during operation. This is important for comfort and compliance with local noise regulations. Generators can range from 50 dB (quiet) to over 80 dB (loud). If you live in a densely populated area or have close neighbors, a quieter generator (50-60 dB) is preferable. For more isolated locations, noise may be less of a concern, allowing for a louder generator if it meets other needs.
Automatic Transfer Switch (ATS)An Automatic Transfer Switch (ATS) automatically switches the power supply from the grid to the generator during an outage. This is important for convenience and ensuring a seamless transition without manual intervention. Some generators come with an ATS, while others require a separate purchase. If you want hassle-free operation and immediate power restoration, choose a generator with an ATS or ensure compatibility with one.
Size and PortabilitySize and portability refer to the physical dimensions and ease of moving the generator. This is important for installation and storage. Larger generators typically offer more power but require more space and may be harder to move. Smaller, portable generators are easier to store and transport but may offer less power. Consider the available space for installation and whether you need to move the generator frequently when choosing the right size.
Maintenance RequirementsMaintenance requirements include the frequency and type of upkeep needed to keep the generator running smoothly. This is important for ensuring long-term reliability and performance. Some generators require regular oil changes, filter replacements, and inspections. Choose a generator with maintenance requirements that you can manage, or consider a model with lower maintenance needs if you prefer less frequent upkeep.

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