Natural Gas Generators for Home Use: Tri-Fuel vs Standby

The best natural gas generators for home use fall into two groups: permanently installed standby units such as the Generac Guardian 10kW and the Honeywell 14kW, and portable tri-fuel machines such as the Westinghouse 14500 and the Champion 5000-watt that can also run on gasoline or propane. If you want power that switches on by itself when the grid drops, pick a standby unit and budget for professional installation. If you want a lower upfront cost and the option to run on natural gas through a hookup when you can, a tri-fuel portable is the cheaper way in. This guide compares both types so you can choose by how you will actually use the generator.

Natural gas is attractive for home backup because the fuel arrives through a utility line, so there is no gasoline to store, rotate or carry in the middle of a storm. The trade-offs are real, though: a gas line must be sized and connected correctly, and utility service can be interrupted in a major event. We cover those issues below, along with the specs each seller publishes for seven natural gas capable models. Where a detail is not shown in the listing, we say “not listed”.

Westinghouse 13500 Peak Watt Tri-Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas, Propane, and Natural Gas Powered

Included for 'Natural Gas Generators for Home Use: Tri-Fuel vs Standby' because the listing specifies Remote Electric Start and Transfer Switch Ready, details this guide uses to compare options.

View on Amazon →

Westinghouse 14500 Peak Watt Tri-Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas, Propane, and Natural Gas Powered

Included for 'Natural Gas Generators for Home Use: Tri-Fuel vs Standby' because the listing specifies Remote Electric Start and Transfer Switch Ready, details this guide uses to compare options.

View on Amazon →

Generac 12,500 Starting Watt Tri-Fuel Portable Generator, Electric Start | Gas, Propane, Or Natural Gas Fuel Options, COsense CO Detection, 9.5 Hour Runtime, Emergency Home Backup, 49 State Compliant

Included for 'Natural Gas Generators for Home Use: Tri-Fuel vs Standby' because the listing specifies 500 Starting Watt Tri-Fuel Portable Generator and Electric Start, details this guide uses to compare options.

View on Amazon →

Westinghouse 8200 Peak Watt Tri-Fuel Portable Inverter Generator, Remote Electric Start, Transfer Switch Ready, Gas, Propane, Natural Gas, Low THD, Safe for Electronics, Parallel Capable, CO Sensor

Included for 'Natural Gas Generators for Home Use: Tri-Fuel vs Standby' because the listing specifies Remote Electric Start and Transfer Switch Ready, details this guide uses to compare options.

View on Amazon →

Top Picks at a Glance

• Best Overall (standby): Generac Guardian 10kW, for an automatic whole-home set-up with a transfer switch and WiFi monitoring listed.
• Best Premium (standby): Champion 22,000-Watt Dual Fuel Standby, for large homes with a 200-amp automatic transfer switch.
• Best Mid-Size Standby: Honeywell 14kW Home Standby, for natural gas or propane operation and weather-protected housing.
• Best Portable Tri-Fuel: Westinghouse 14500 Peak Watt Tri-Fuel, for the highest output in a transfer-switch-ready portable.
• Best Value Portable: DuroMax XP13000HXT, for a 13,000-watt tri-fuel with a CO alert listed.
• Best Budget Tri-Fuel: Champion 5000-Watt Electric Start Tri Fuel, for essentials like a fridge, lights and a furnace fan.
• Best Whole-Home Upgrade: Generac 14kW Whole Home Generator, for larger loads with cellular monitoring listed.

Quick Comparison Table

Natural Gas Standby vs Portable: What Actually Differs

A standby generator is bolted to a pad outside, connected to the home’s gas line and an automatic transfer switch, and starts without anyone being home. A portable tri-fuel generator sits in a garage or shed and is connected to a transfer switch or inlet by a cord, and it needs a person to wheel it out, start it and connect the fuel. Both can burn natural gas, but the experience is very different.

1. Generac Guardian 10kW: Best Overall for Automatic Home Backup

• 10kW standby output class
• Runs on natural gas or propane
• Transfer switch and WiFi monitoring listed
• Whole-house backup positioning
• Exact circuit capacity: depends on your panel and loads

Best for: a typical home that wants key circuits to stay on without lifting a finger. Skip if: you want to power several large appliances at once, including central air and an electric dryer, without a load plan.

At 10kW, this class of standby generator is generally sized to run a refrigerator, lights, a furnace blower, a sump pump, a well pump and some outlets, with a smaller air conditioner if the electrician plans for it. It is not a whole-house system for every load. Ask the installer to total the starting and running watts of the circuits you need, then compare with the generator’s rated output on natural gas, which is typically lower than the propane figure.

WiFi monitoring is useful for checking exercise cycles and fault codes, which saves a service call. Standby units run a weekly self-test, so expect a short noise cycle on a schedule.

Pros: automatic operation, transfer switch listed, remote monitoring, well-known service network. Cons: premium cost, professional installation needed, output limits with large loads.

2. Honeywell 14kW Home Standby: Best Mid-Size Standby

• 14kW home standby generator
• Natural gas or propane
• Automatic backup power for the whole home as marketed
• Weather protected housing listed

Best for: a larger home that wants central air or an electric range circuit included in the backup plan. Skip if: your electrical load is small, in which case a 10kW class unit is enough.

Going from 10kW to 14kW opens a wider list of circuits, but remember that the central air conditioner is usually the largest single load. A 3-ton air conditioner can need several kilowatts to start, so check its starting current before assuming it will run. If you add an electric water heater, the total climbs fast, which is where a load-management module comes in. Ask your installer whether the unit uses one.

Pros: higher capacity, dual fuel flexibility, automatic start. Cons: premium cost, professional installation, large footprint.

3. Champion 22,000-Watt Dual Fuel Standby: Best Premium for Large Homes

• 22,000-watt class, liquid propane or natural gas
• 200-amp automatic transfer switch listed
• Designed as a whole house home standby generator

Best for: bigger homes with multiple HVAC systems, an electric dryer and a well pump. Skip if: a smaller unit with a load plan would cover your needs for a lot less.

The 200-amp automatic transfer switch is the main feature here. It allows the generator to back up the entire panel, instead of a select group of circuits, as long as the total load stays within the generator’s real output. A bigger engine also burns more fuel, so check that your gas meter and line size can deliver the required flow; undersized gas lines are a common cause of failed installations. Expect a full inspection and, in many areas, a permit.

Pros: highest output of the group, full-panel transfer switch, dual fuel. Cons: top premium cost, large gas demand, heavy installation work.

4. Westinghouse 14500 Peak Watt Tri-Fuel: Best Portable Tri-Fuel

• 14,500 peak watts, tri-fuel (gasoline, propane, natural gas)
• Remote electric start
• Transfer switch ready
• Marketed as a home backup portable generator

Best for: a household that wants high output at a portable price, with the option of running on gasoline when natural gas is not connected. Skip if: you need automatic start when you are away.

The key number to understand is peak versus running watts. Peak watts describe the brief surge capacity; the running figure is lower and is the number to plan against. On natural gas, output is usually lower than on gasoline, so check the manufacturer’s table before you size your loads. Because this machine is transfer switch ready, a licensed electrician can wire a switch or inlet so you do not need extension cords through a window.

Portable generators produce carbon monoxide. Run them outdoors, well away from windows, doors and vents, never inside a garage, and install working CO alarms in the home.

Pros: big output, remote start, three fuel options, transfer switch ready. Cons: heavy, manual set-up, natural gas output lower than gasoline.

5. DuroMax XP13000HXT: Best Value Portable Tri-Fuel

• 13,000-watt, 500cc engine, tri fuel
• Gasoline, propane and natural gas
• CO alert listed

Best for: buyers who want a large portable that runs on natural gas without paying for a standby install. Skip if: you want the quiet of an inverter generator.

The engine size is a clue to the noise and fuel use. A 500cc open-frame engine is loud and runs at a fixed speed, so expect a conventional generator sound. The CO alert is a helpful safety feature, but it is not a substitute for placing the unit outdoors and keeping the exhaust away from the house. For natural gas, you will need an approved regulator and hose kit, which varies by model, so check what is included.

Pros: large output, three fuels, CO alert. Cons: loud, heavy, natural gas kit may be sold separately.

6. Champion 5000-Watt Electric Start Tri Fuel: Best Budget Option

• 5,000-watt class, electric start
• Gas, propane and natural gas
• LPG and natural gas ready per the listing

Best for: an essentials-only plan: refrigerator, freezer, lights, internet, a furnace blower and a few small appliances. Skip if: you need central air or an electric range.

The small class is easier to move, quieter than the 13,000-watt machines, and lighter on fuel. It is also the cheapest way to get natural gas capability into a portable. Do a simple load list: write down every item you need, its running watts, and the largest starting watts, then add a margin of 20 percent. If that sum is under 4,000 watts, this class fits.

Pros: lower cost, three fuels, easier to handle. Cons: limited output, no whole-house capability.

7. Generac 14kW Whole Home Generator: Best Whole-Home Upgrade

• 14kW whole home generator
• Cellular capability listed
• Automatic backup power with whole-house coverage as marketed
• Transfer switch bundles are sold in some versions; check the exact listing

Best for: homeowners who want the extra capacity and remote monitoring without moving to the highest tier. Skip if: your loads fit within a 10kW unit.

Cellular monitoring is useful because the generator reports faults even if your home internet is down. Several Generac listings come with or without an automatic transfer switch, so read carefully to see whether the switch is included or must be bought separately. The decision between a 10kW and 14kW unit comes down to load calculations by your electrician rather than the brand name.

Pros: larger capacity, cellular monitoring, automatic operation. Cons: premium cost, professional installation, switch may be separate.

Also Consider

• Generac 12,500 Watt Tri-Fuel Portable: a portable tri-fuel with electric start, as an alternative to the Westinghouse.
• WEN 14,500-Watt Tri-Fuel: 120V and 240V, transfer switch ready with electric start, a budget-friendlier large portable.
• Westinghouse 8200 Peak Watt Tri-Fuel Inverter: a quieter inverter-style portable with remote start, for smaller loads.
• Generac 22kW Whole Home Generator: a larger standby option when the Guardian 10kW is not enough.

On-Demand and Permanently Installed Generators: What to Know

Shoppers searching for on-demand home generators usually mean a generator that starts automatically when the power goes out. That describes a permanently installed standby unit with an automatic transfer switch: it senses the outage, starts the engine and transfers the load within seconds. Portable units can be connected through a manual transfer switch or interlock, but they do not start on their own. If you are away often, or someone in the home relies on powered medical equipment, an automatic unit is the more dependable approach, and you should talk with your doctor and your equipment supplier about backup planning.

How We Chose

This guide is research-based. We did not personally use these generators. We compared manufacturer product pages, seller listings, installation guides and published code requirements, then selected models that explicitly list natural gas as a fuel and that are currently sold. We kept to a mix of standby and portable machines, limited each brand to one or two entries, and left out generators that run only on gasoline or propane. We have not repeated any third-party consumer ratings. Where a spec such as natural gas output or included hardware is missing, we mark it “not listed” and tell you to check the maker’s table.

Buying Guide

Size by watts, not by brand

List every device you need to run and write down its running watts and, for motors, its starting watts. A refrigerator may run at 150 to 250 watts but start at several times that. A well pump, sump pump or air conditioner has a large starting surge. Add the running watts of everything that can run together, then add the largest starting surge on top. A home that needs 6,000 running watts plus a 3,000-watt start needs a generator rated around 9,000 watts or more on natural gas.

Check natural gas output, not just the headline rating

Generators usually produce less power on natural gas than on gasoline or propane, often around 10 percent less. Use the natural gas figure in the manual when sizing. Standby generators list separate numbers for natural gas and propane, so compare the one you will actually use.

Gas supply and line size

A larger generator can consume several hundred cubic feet of natural gas per hour at full load. Your meter, regulator and pipe diameter must all be able to supply that flow while the furnace and water heater also run. A licensed gas fitter should size the line and pressure-test it. This is not a DIY job for most people.

Transfer switch and electrical work

A transfer switch isolates your home from the grid so generator power does not feed back onto utility lines, which is a serious danger to line workers. Always have a licensed electrician install the transfer switch, interlock or inlet and pull any needed permits. Automatic transfer switches are required for standby operation, while manual switches work for portable units.

Noise, placement and local rules

Standby units usually must sit several feet from windows, doors and the property line. Local codes and homeowner association rules vary, so check your jurisdiction. Noise matters for neighbors, so look at published decibel figures and the weekly exercise schedule.

Common Mistakes

• Buying on peak watts and forgetting the lower natural gas running output.
• Skipping the load list and finding out during an outage that air conditioning will not run.
• Running a portable generator in a garage or too close to a window.
• Backfeeding a panel through a dryer outlet instead of installing a proper transfer switch.
• Assuming natural gas service will never be interrupted; keep a plan for long outages.

Frequently Asked Questions

What is the best natural gas generator for home use?

For automatic whole-home backup, a standby unit such as the Generac Guardian 10kW or the Honeywell 14kW is the best fit. For a lower cost, a tri-fuel portable such as the Westinghouse 14500 or DuroMax XP13000HXT can run on natural gas through a proper hookup.

What size natural gas generator do I need for a house?

Most homes that want essentials plus some comfort loads land between 10kW and 14kW for a standby unit. Add up the running watts of the devices you need and the largest motor starting surge, and ask an electrician to confirm with a load calculation.

Can a portable generator run on natural gas?

Yes, if it is a dual-fuel or tri-fuel model with a natural gas kit. Output on natural gas is typically lower than on gasoline, and the gas connection should be made by a qualified installer.

Are natural gas generators better than propane or gasoline?

They avoid fuel storage and refueling, which is convenient in a long outage. However, you depend on utility gas service, and output may be lower. Propane and gasoline are portable and independent of the grid but must be stored and refilled.

Do natural gas generators need a transfer switch?

Yes. A transfer switch or interlock, installed by a licensed electrician, keeps generator power from feeding back into the grid and lets you power circuits safely.

How much does it cost to install a standby generator?

Installation cost varies widely by location, distance from the gas meter, permits and electrical work. Get written quotes from licensed installers and ask exactly what is included, from the pad to the transfer switch and gas line.

Is it safe to run a generator during a storm?

Standby generators are designed to run outdoors in weather within the manufacturer’s limits. Portable generators must be kept dry and well away from the house, using a proper canopy or tent made for the purpose, and never inside a garage or enclosed space.

Which One Should You Buy?

If you want automatic power and are ready to pay for installation, start with the Generac Guardian 10kW for average homes, step up to the Honeywell 14kW or the Generac 14kW for more loads, and look at the Champion 22,000-watt for the biggest houses. If you want to spend less, buy a tri-fuel portable: the Westinghouse 14500 for maximum output, the DuroMax XP13000HXT for value, and the Champion 5000-watt for essentials. In every case, plan the load list first, hire licensed pros for gas and electrical work, and install CO alarms.

Sources

• Generac, Honeywell, Champion, Westinghouse and DuroMax product pages and manuals
• National Fire Protection Association guidance on generator installation
• US Consumer Product Safety Commission carbon monoxide and generator safety information
• US Department of Energy backup power planning guidance

Last updated: October 2026