For whole-home backup, choose Generac or Kohler standby generators, usually available through major home improvement stores which also facilitate professional installation. For portable needs, DuroMax and Westinghouse offer tri-fuel generators capable of running on natural gas, propane, or gasoline, and these are readily available from online retailers like Amazon or the manufacturer websites.
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Generac
Best for permanent, whole-home standby power. These units require professional installation and connection to your natural gas line, often coordinated through major retailers like Home Depot or Lowe's.
For whole-house automatic backup: the Generac 18kW or 22kW models are worth looking at. Current online listings are roughly $6,000–$6,200 for the generator itself, depending on model/dealer.
For a less expensive portable setup: the Westinghouse WGen10500TFc is around $1,249 and supports natural gas, propane and gasoline.
For more portable capacity: the DuroMax 15,000W tri-fuel is around $3,499.
One important point: don't choose the generator solely by advertised wattage. Natural-gas output can be lower than the headline rating, and your home's electrical service, HVAC startup loads, water heater, well pump, etc. determine the appropriate size. Current generator guides also emphasize that installation and local service availability are major considerations.
If you tell me (1) your approximate house size, (2) whether you have central A/C, and (3) whether you want automatic whole-house backup or a portable generator, I can narrow this to 2–3 specific models you can buy online.
You can buy several top-rated natural gas-capable generators online, ranging from permanent whole-house standby units to flexible portable/tri-fuel models.
Whole-House & Home Standby Generators (Permanent)
These units hook directly into your home's municipal natural gas supply for automatic, continuous backup power.
Generac Guardian 14kW Standby Generator (Model 7258): A popular air-cooled whole-home/essential circuit system that starts automatically during an outage. It is available online through retailers like Lowe's . Price: ~$4,319.
Cummins QuietConnect RS17A 17kW Standby Generator : Known for ultra-quiet operation (~ 65 dB) and a robust commercial-grade design running on natural gas or propane. You can find it online at Northern Tool . Price: ~$5,167.
Kohler RCAL Series 26kW Standby Generator : A high-capacity air-cooled system that handles heavy electrical loads like large HVAC systems and full-home demands. Available online via specialized dealers like AB Electric / AP Electric or home equipment suppliers. Price: ~$8,048 (often bundled with a transfer switch).
Portable & Tri-Fuel Generators (Flexible)
If you prefer a portable unit that can run on natural gas alongside propane or gasoline, look into tri-fuel options:
DuroMax XP15000HXT Tri-Fuel Portable Generator : A massive single-cylinder portable generator capable of running on natural gas, offering push-button/remote start and high wattage output. Available online through suppliers like Norwall.
You can buy several types of natural gas-compatible generators online, ranging from portable tri-fuel models to whole-home standby systems.
Portable Tri-Fuel and Dual-Fuel Generators
Portable options run on gasoline, propane, or natural gas using specialized conversion hoses. They can be purchased directly from major online home improvement retailers.
Westinghouse Wgen12500DFc / Tri-Fuel Models: Available on platforms like Home Depot , providing high peak wattages (around 12,500 peak watts) with natural gas connectivity.
Champion Power Equipment Tri-Fuel Series : Offers portable generators featuring built-in natural gas inlets and necessary hoses, frequently stocked online via Champion Power Equipment or major hardware distributors.
DuroMax XP13000HXT: A heavy-duty, tri-fuel portable unit capable of running on natural gas, available directly through the DuroMax Power Equipment Store.
Whole-Home Standby Generators
For permanent automatic backup power connected directly to your municipal natural gas line, standby units are available through authorized online power equipment dealers and home improvement sites.
Generac Guardian Series (14kW–22kW) : The industry standard for residential standby power, frequently sold online complete with an automatic transfer switch via Lowe's or specialized online power dealers like Norwall PowerSystems.
Kohler Home Standby Series (20kW) : Known for tight voltage regulation and quiet operation, available via online generator superstores and select dealers.[](https://www.nationwidegenerators.com/natural-gas/)
If you can tell me whether you need a portable unit for temporary use or a permanent standby system for your entire house, I can help narrow down the right wattage size and online retailer for your setup.
Westinghouse iGen5000DF Portable Generator - $849.00 (The Home Depot)
For a typical house: The Generac 22kW is a straightforward choice. It's currently listed around $6,189 for the generator alone, and the natural-gas rating is 19.5kW. Consumer Reports' 2026 testing also includes this model among its tested standby generators.
If you specifically want strong natural-gas output: The Briggs & Stratton PowerProtect 22kW is listed at about $8,106 with a 200A transfer switch and is rated for 22kW on natural gas according to current comparison data.
If you don't want permanent installation: Be careful with portable models. Many products advertised as "dual fuel" mean gasoline + propane, not natural gas. For natural gas, you specifically need a tri-fuel model that supports NG.
If you tell me (1) your house size, (2) whether you have central A/C, and (3) whether you want whole-house automatic backup or a portable generator, I can narrow it down to 2–3 specific generators and current online prices.
You can buy several top-tier natural gas-capable generators online, ranging from whole-house permanent standby units to flexible portable/tri-fuel options.
Home Standby Generators (Permanent / Whole-House)
These permanently connect to your home’s municipal natural gas line and kick on automatically during an outage.
Generac Guardian Series (e.g., 14kW to 22kW models) — The most popular home standby line on the market, featuring Wi-Fi connectivity and automatic transfer switches . You can buy them directly through major online home improvement retailers like Lowe's or The Home Depot.[1][2]
Briggs & Stratton PowerProtect (e.g., 13kW model) — Engineered with NGMax technology for optimized performance specifically on natural gas in a compact footprint. Available online via Lowe's.
Tri-Fuel Portable Generators (Flexible / Mobile)
If you want something movable that can plug directly into a natural gas quick-connect valve on your house (along with gas or propane), look at tri-fuel portables:
A massive 13,000-peak-watt tri-fuel portable unit that runs on natural gas out of the box with an included hose. Available to order on the DuroMax Power Equipment Store.
A high-capacity tri-fuel inverter generator that outputs clean power (<3% THD) safe for sensitive electronics while running on natural gas. Available through Lowe's.
Features wireless remote start and CO Shield safety tech, runnable on natural gas right away. Available online via Tractor Supply Co..[1][2][3]
To help narrow down the ideal choice, let me know:
Are you looking for a permanent standby unit or a portable generator?
Roughly how many watts or which major appliances do you need to power?
You can easily buy natural gas generators online, ranging from heavy-duty portable tri-fuel units to permanent home standby systems.
1. Portable Tri-Fuel Generators (Runs on Gas, Propane, and Natural Gas)
These portable units connect to your home's natural gas supply line via a conversion hose, giving you multi-fuel versatility without needing a permanent installation.
Westinghouse WGen14500TFc — An 18,000 peak / 11,600 running watt tri-fuel portable powerhouse equipped with remote electric start and a CO detector. Available to order online at The Home Depot.
2. Home Standby Generators (Permanent Natural Gas / Liquid Propane)
These units sit outside your house permanently, hook directly into your municipal natural gas line, and turn on automatically during a power outage.[1][2]
Generac Guardian Series The gold standard for residential standby power, frequently available for online purchase through specialized power equipment sites and home improvement stores.[1][2]
To help narrow down the best option, tell me:
Do you want a portable unit you can roll out during emergencies, or a permanent standby unit wired directly to your electrical panel?
What specific appliances or square footage do you need to power?
Yes. If you mean a permanently installed home standby generator that runs on your existing natural-gas line, there are several good options you can buy online.
My top picks
Generac 14kW with 200A Transfer Switch - $5,255.10 (The Home Depot)
Best overall: Generac 14 kW + 200A transfer switch — about $5,839.
It runs on natural gas or propane and includes the automatic transfer switch, so it's a good middle-ground for a typical home. Generac rates this model at 14 kW on natural gas.
Generac 10kW + 16-Circuit Transfer Switch - $4,076.10 (The Home Depot)
Kohler 14kW - $5,449.00 (The Home Depot)
Generac 18kW + 200A Transfer Switch - $6,639.00 (The Home Depot)
Kohler 20kW - $6,299.00 (The Home Depot)
Briggs & Stratton 18kW + 200A Transfer Switch - $6,899.00 (The Home Depot)
10 kW Generac — ~$4,329: Good if you mainly need essentials such as refrigerator, lights, HVAC controls, internet, and selected circuits.
14 kW Generac — ~$5,839:My default recommendation for many homes.
18 kW Generac — ~$6,639: Better if you have a larger home or want to run more HVAC/appliances simultaneously.
20 kW Kohler — ~$6,299: Worth considering if you want additional capacity without jumping to a very large generator.
18 kW Briggs & Stratton — ~$6,899: Another strong whole-home option with a 200A transfer switch.
Generac currently lists natural-gas/LP standby generators from 10 kW through much larger 28 kW models.
One important point: buying the generator online isn't the same as installing it. A natural-gas standby unit needs proper electrical, gas-line sizing, transfer-switch installation, clearances, grounding, and permitting. For example, the Generac 14 kW requires 3.5" water-column natural-gas pressure and can consume roughly 256 ft³/hour at 100% load, so your home's gas service needs to be able to supply it.
If you tell me (1) your home's approximate square footage, (2) whether you have central AC and its tonnage, and (3) whether you want to run the entire house or just essentials, I can tell you exactly which kW size I'd buy and which online listing is the best deal.
Yes. If you specifically want natural gas, I'd narrow it to these:
Best options
Generac 10kW Natural Gas/Propane Standby Generator - $4,329.00 (The Home Depot)
Best for automatic home backup: Generac 10kW — about $4,329 with a 100A transfer switch. It connects to your home's natural-gas supply and starts automatically during an outage.
FIRMAN 10,000W/8,000W Tri-Fuel Portable Generator - $1,591.28 (The Home Depot)
Best portable option: FIRMAN T08072 — about $1,591, and it can run on natural gas, propane, or gasoline. It's a good choice if you don't want a permanently installed generator.
Generac 14kW Natural Gas/Propane Standby Generator - $5,839.00 (The Home Depot)
For a larger home: Generac 14kW — about $5,839 including a 200A transfer switch. Home Depot currently lists it for online purchase.
One important distinction
If you have natural gas service at your house, I would generally choose a standby generator if you want the generator to automatically take over when the power fails. Portable tri-fuel generators are considerably cheaper, but you'll need to set them up and connect them when the outage occurs.
For comparison, Home Depot currently lists natural-gas-capable portable models such as the Champion 11,500/9,200W tri-fuel for $999 and Westinghouse 14,500/11,500W tri-fuel for $1,499.
If you tell me your budget (e.g. under $1,000, $2,000, or $5,000) and whether you want portable or whole-house automatic backup, I can pick the best 2–3 models currently available online.
You can buy several types of natural gas generators online depending on whether you want a portable/tri-fuel generator (which rolls out and hooks up to a natural gas line) or a permanent home standby generator (which is permanently installed outside).
Popular, reliable models available for online purchase include:
1. Portable & Tri-Fuel Generators (Run on Gas, Propane, and Natural Gas)
2. Permanent Home Standby Generators (Auto-connect to Natural Gas)
Generac Guardian Series (e.g., 14kW to 22kW models) : The industry standard for whole-home automatic backup. It senses power loss and kicks on automatically using your existing natural gas line. Available to order online through Lowe's or Acme Tools.
Briggs & Stratton PowerProtect Series (e.g., 22kW) : Features NGMax technology for superior performance on natural gas and a tight installation footprint. Available from specialized online power equipment retailers like Mr. Volt Inc..
To help narrow down the best option, tell me:
Are you looking for a portable unit you can wheel out, or a permanent standby unit?
Roughly how many watts or which appliances do you need to power during an outage?
