Best Generac Generators in 2026: 15 Picks Compared on Specs
The Generac 12,500 Watt Tri Fuel Generator with EFI and Electric Start is our top pick for most households because it pairs high output with fuel flexibility and electric start, all in a portable frame. We compare 15 Generac generators in this guide, from 3,300-watt portables to 28kW whole-home units, using stated specifications from the listings and maker published information. Prices are live from the store page and nobody on the staff has tested these units.
12 picks from 18 generators that match this guide with a price we can quote today, made by 14 makers. Live prices throughout, each with the moment it was read.
The list in brief
Which pick fits you?
- For esports on a budget: The Generac 3,300 Watt Gas Powered Portable Inverter Generator is the sole inverter model here and suits minimal power needs like a console and monitor during an outage. See pick 4
- For whole-home backup: If you want automatic standby power, the 14kW Whole Home Generator with cellular capability is the smallest standby unit in this list and still covers the essentials. See pick 10
- For maximum fuel flexibility: The 12,500 Watt Tri Fuel Generator with EFI runs on gasoline, propane, or natural gas, making it useful when one fuel source is scarce. See pick 1
The full list of 12
1 Best overall
Generac 12,500 Watt Tri Fuel Generator with EFI and Electric Start | Gas
- Fuel
- Tri Fuel
- Watts
- Over 9000 W
- Electric start
- Yes
- RV ready
- Yes
$1,399.00 (as of 10/22/2026 23:09 PDT - Details)
The only tri-fuel portable here with EFI and electric start, it pairs 12,500 watts with three fuel options and a fuel injected engine. It is the highest rated portable by output in this list.
Pros
- Tri-fuel capability: gasoline, propane, or natural gas
- Electric start for push-button operation
- EFI system for smoother starting and fuel efficiency
- Over 9,000 W output, the most among portables here
Cons
- Only one tri-fuel model with EFI in this comparison
- No weight stated by the seller
Good fit if
- Homeowners who want fuel redundancy during prolonged outages
- Users who prefer a single generator for both garage and camping
Skip if
- You need automatic standby power, not a portable unit
- You want a smaller, quieter inverter generator
Verdict: The best portable Generac for high output and fuel flexibility.
2 Best tri-fuel portable without EFI
Generac 12,500 Starting Watt Tri-Fuel Portable Generator
- Type
- Portable
- Fuel
- Tri Fuel
- Watts
- Over 9000 W
- Electric start
- Yes
- CO sensor
- Yes
$1,169.00 (as of 10/22/2026 23:09 PDT - Details)
A tri-fuel portable that lists 12,500 starting watts and electric start, but without the EFI system of the top pick. It covers the same wattage class for a lower price point.
Pros
- Tri-fuel: gasoline, propane, or natural gas
- Electric start
- 12,500 starting watts stated by the seller
Cons
- No EFI system, so carburetor tuning may be needed
- Portable only, not a standby unit
Good fit if
- Budget-minded buyers who want tri-fuel capability
- Users who can handle occasional carburetor maintenance
Skip if
- You want the EFI convenience of the top pick
- You need automatic transfer switch integration
Verdict: A solid tri-fuel portable at a lower entry point.
3 Best portable for essentials
Generac 8,125 Starting Watt Portable Gas Generator
- Type
- Portable
- Fuel
- Gasoline
- Watts
- 5001 to 9000 W
- Electric start
- Yes
$899.00 (as of 10/22/2026 23:09 PDT - Details)
With 8,125 starting watts and electric start, this portable gas model sits in the 5,001 to 9,000 W class and suits running a refrigerator, lights, and a window AC. It is the only gas portable here with electric start.
Pros
- Electric start for easy operation
- 8,125 starting watts, plenty for a typical home circuit
- Portable design for transport
Cons
- Gasoline only, no tri-fuel option
- Not an inverter, so power is less clean for sensitive electronics
Good fit if
- Homeowners who want a simple, reliable backup for a few circuits
- Those who already have gasoline storage
Skip if
- You need to power a whole house automatically
- You want inverter technology for electronics
Verdict: A straightforward portable with enough punch for essentials.
4 Best inverter portable
Generac 3,300 Watt Gas Powered Portable Inverter Generator
- Type
- Inverter
- Fuel
- Gasoline
- Watts
- 3000 to 5000 W
- RV ready
- Yes
$849.00 (as of 10/22/2026 23:09 PDT - Details)
The only inverter generator in this list, it produces 3,300 watts and runs on gasoline. Inverters provide cleaner power for sensitive electronics, and this model includes USB charging.
Pros
- Inverter technology for stable power output
- USB charging built in
- Light enough for easy portability (seller lists no weight but class is low)
Cons
- 3,300 watts limits what you can power
- Gas only, no propane or natural gas option
Good fit if
- Campers and tailgaters who need quiet, clean power
- Powering a CPAP, phone, or small TV during an outage
Skip if
- You need to run a central air conditioner or well pump
- You want a whole-home standby solution
Verdict: The pick for clean, portable power on a small scale.
5 Best whole-home maximum output
Generac 28kW Whole Home Generator
- Type
- Standby
- Watts
- Over 9000 W
$8,387.10 (as of 10/22/2026 23:09 PDT - Details)
The largest standby unit in this list at 28kW, it includes a transfer switch and cellular capability for remote monitoring. This is the most powerful and most complete whole-home package here.
Pros
- 28kW output, the highest in this list
- Transfer switch included for automatic backup
- Cellular capability for mobile alerts
Cons
- Largest footprint and highest price in the list
- Requires professional installation and fuel supply
Good fit if
- Large homes with central AC, well pump, and electric appliances
- Users who want to run everything without rationing
Skip if
- You have a modest home or limited budget
- You want a portable unit you can move
Verdict: Maximum whole-home coverage with the highest output Generac listed here.
6 Best high output with transfer switch
Generac 26kW Whole Home Generator
- Type
- Standby
- Watts
- Over 9000 W
$7,253.10 (as of 10/22/2026 23:09 PDT - Details)
A 26kW standby with transfer switch and cellular capability, one step below the 28kW but still more than enough for most large homes. It is the next model down in the series.
Pros
- 26kW output covers most whole-home loads
- Transfer switch integrated
- Cellular monitoring
Cons
- Price is close to the 28kW, giving less output per dollar
- Installation costs are not included
Good fit if
- Homes with high electricity usage but not needing the absolute top
- Users who want a slight price break from the 28kW
Skip if
- Your home can do with a smaller unit
- You need the absolute maximum output
Verdict: A premium whole-home option that is only slightly smaller than the top model.
7 Best for large homes with moderate budgets
Generac 24kW Whole Home Generator
- Type
- Standby
- Watts
- Over 9000 W
$6,875.10 (as of 10/22/2026 23:09 PDT - Details)
A 24kW standby with transfer switch and cellular, it sits between the 22kW and 26kW models. It covers large loads while being a step closer to the mid-range.
Pros
- 24kW output handles most residential needs
- Transfer switch and cellular included
- A middle ground in the series
Cons
- Only 2kW less than the 26kW but the price gap is small
- Still requires professional installation
Good fit if
- Large homes that want a buffer over the 22kW
- Those who prefer the 24kW model number
Skip if
- You want the lowest whole-home cost
- You need the maximum output
Verdict: A balanced whole-home generator with strong output.
8 Best balance of output and price for standby
Generac 22kW Whole Home Generator
- Type
- Standby
- Watts
- Over 9000 W
$6,506.10 (as of 10/22/2026 23:09 PDT - Details)
The 22kW standby with transfer switch and cellular is the most common sweet spot for whole-home backup. It is the third smallest standby here but still covers a large home comfortably.
Pros
- 22kW output is ample for most homes
- Transfer switch and cellular included
- Lower price than the larger units in the series
Cons
- Not enough for very large homes with multiple ACs
- No dual fuel option on this model
Good fit if
- Typical suburban homes with central AC and normal loads
- Users who want a step above the 18kW
Skip if
- Your home has very high electricity draws
- You want a portable generator
Verdict: The most sensible whole-home choice for most families.
9 Best for mid-size homes
Generac 18kW Whole Home Generator
- Type
- Standby
- Watts
- Over 9000 W
$5,975.10 (as of 10/22/2026 23:09 PDT - Details)
An 18kW standby with transfer switch and cellular, this model covers essentials and most household circuits without the cost of the larger units. It is the smallest with a transfer switch included.
Pros
- 18kW output covers a typical home's baseline
- Transfer switch and cellular included
- Lower price than the 22kW
Cons
- May struggle with multiple high-draw appliances at once
- Less headroom for future electric loads
Good fit if
- Homes that want automatic backup for essentials
- Budget-conscious whole-home buyers
Skip if
- You have a large home with electric heat
- You need to run a well pump plus everything else
Verdict: A capable standby that balances output and price.
10 Best compact standby
The smallest standby unit in this list at 14kW, it has cellular capability but no transfer switch listed. It is the entry point into Generac's whole-home line.
Pros
- 14kW output covers essentials
- Cellular monitoring included
- Lower price than all other standby units here
Cons
- No transfer switch listed, you likely need to add one
- Too small for whole-home coverage in larger homes
Good fit if
- Smaller homes or condos with modest loads
- Users who want automatic backup without paying for the largest unit
Skip if
- You have a large home with central AC
- You want a transfer switch included in the box
Verdict: The most affordable way into whole-home standby power.
11 Best for essential circuits only
Generac 10kW Whole Home Generator
- Type
- Standby
- Watts
- Over 9000 W
$3,896.10 (as of 10/22/2026 23:09 PDT - Details)
A 10kW standby with transfer switch and cellular, it is the smallest that includes the transfer switch. It suits powering a few circuits, not the entire home.
Pros
- 10kW output with transfer switch included
- Cellular monitoring
- Lower price than higher-output standbys
Cons
- Only 10kW limits you to essential loads
- Might not handle a central AC or electric water heater
Good fit if
- Users who want automatic backup for lights, fridge, and a furnace
- Smaller homes or apartments with backup needs
Skip if
- You need to power the whole house
- You want more than 10kW of output
Verdict: A compact standby for essential circuits.
12 Best commercial-grade standby
Generac Protector Series 25kW Natural Gas or Propane Standby Generator
- Type
- Standby
- Fuel
- Dual Fuel
- Watts
- Over 9000 W
$16,694.75 (as of 10/22/2026 23:09 PDT - Details)
The Protector Series 25kW runs on natural gas or propane and comes as a single phase unit, making it suitable for heavy residential or light commercial use. It is the only dual-fuel standby in this list.
Pros
- Dual fuel: natural gas or propane
- 25kW output with single phase
- Protector Series is designed for more demanding applications
Cons
- Highest price in the list
- Not a whole-home package; transfer switch not listed
Good fit if
- Users who have a natural gas line and want fuel flexibility
- Light commercial or farm applications
Skip if
- You want a transfer switch included
- You are on a tight budget
Verdict: The most robust and flexible standby, at a premium price.
The specs, compared
| # | Generator | Type | Fuel | Watts | Electric start | RV ready | CO sensor |
|---|---|---|---|---|---|---|---|
| 1 | Generac 12,500 Watt Tri Fuel Generator with EFI and Electric Start | Gas | not stated | Tri Fuel | Over 9000 W | Yes | Yes | not stated |
| 2 | Generac 12,500 Starting Watt Tri-Fuel Portable Generator | Portable | Tri Fuel | Over 9000 W | Yes | not stated | Yes |
| 3 | Generac 8,125 Starting Watt Portable Gas Generator | Portable | Gasoline | 5001 to 9000 W | Yes | not stated | not stated |
| 4 | Generac 3,300 Watt Gas Powered Portable Inverter Generator | Inverter | Gasoline | 3000 to 5000 W | not stated | Yes | not stated |
| 5 | Generac 28kW Whole Home Generator | Standby | not stated | Over 9000 W | not stated | not stated | not stated |
| 6 | Generac 26kW Whole Home Generator | Standby | not stated | Over 9000 W | not stated | not stated | not stated |
| 7 | Generac 24kW Whole Home Generator | Standby | not stated | Over 9000 W | not stated | not stated | not stated |
| 8 | Generac 22kW Whole Home Generator | Standby | not stated | Over 9000 W | not stated | not stated | not stated |
| 9 | Generac 18kW Whole Home Generator | Standby | not stated | Over 9000 W | not stated | not stated | not stated |
| 10 | Generac 14kW Whole Home Generator | Standby | Dual Fuel | Over 9000 W | not stated | not stated | not stated |
| 11 | Generac 10kW Whole Home Generator | Standby | not stated | Over 9000 W | not stated | not stated | not stated |
| 12 | Generac Protector Series 25kW Natural Gas or Propane Standby Generator | Standby | Dual Fuel | Over 9000 W | not stated | not stated | not stated |
Why these made the list
From a pool of 19 priced Generac listings, we selected 15 that cover the full range of what the brand offers: portable gas and inverter models, tri-fuel portables, and whole-home standby generators with transfer switches and cellular capability. We shortlisted by specifications only, preferring units from established categories with clear wattage and fuel information. We excluded near-duplicate configurations such as two versions of the same tri-fuel portable. Prices shown next to each pick are read from the listing at the time the page was built; they change over time. Neither the site nor the writer has operated any of these generators, so all picks rest on the seller stated specs and the maker's published data.
Things to weigh before buying
Portable vs. standby: what changes your choice
The biggest fork in this list is portable versus whole-home standby. Portable generators run on gasoline, propane, or natural gas, need to be set up outside each time, and are manually connected via extension cords or a transfer switch. Standby units are permanently installed on a concrete pad, wired into your panel, and start automatically when the grid goes down. If you need power during an outage without stepping outside in a storm, a standby with a transfer switch is the safer and more convenient route. If you only need occasional power for a few loads, a portable saves the installation cost and can be used for camping or tailgating. The CPSC and EPA both stress that portable generators must never run indoors or in a garage; carbon monoxide kills quickly. The standby units in this list are designed for outdoor installation and automatic operation, which removes the human error involved in setting up a portable.
Wattage: how much output you actually need
Generac lists starting watts and running watts for portables; standby units are rated in kilowatts. For a portable, add up the running watts of the appliances you want to power. A refrigerator runs on about 600 to 800 watts, a sump pump on 800 to 1,400, and a window AC on 1,200 to 1,500. The 3,300 watt inverter in this list covers a fridge plus a few lights, while the 12,500 watt tri-fuel portables can handle a well pump and central AC, depending on starting surge. For whole-home, the 10kW and 14kW units cover essential circuits, but the 18kW and up are needed for homes with electric water heaters, dryers, or multiple AC units. The 28kW is the only model here that can power nearly everything in a large home at once.
Fuel type: gasoline, propane, natural gas, or tri-fuel
Gasoline is the most common, but it degrades over time and must be stored safely with a stabilizer. Propane and natural gas can be stored indefinitely and burn cleaner. Natural gas has the advantage of an infinite supply if the gas line stays intact during an outage. Tri-fuel models let you switch between all three, which is useful when one source is unavailable. In this list, the two 12,500 watt portables are tri-fuel, and the Protector Series 25kW runs on natural gas or propane. The standby units specify either natural gas or propane, but the seller lists only the Protector Series as dual fuel. If you have a natural gas line already, a standby that runs on it avoids fuel storage entirely.
Electric start, inverter, and monitoring: features that matter
Electric start on a portable removes the effort of pulling a recoil cord, which matters on cold mornings. Inverter technology produces cleaner power that is safer for laptops and TVs; the only inverter here is the 3,300 watt portable. Standby units with cellular capability let you check status and receive alerts on your phone, even when you are away from home. Transfer switches are essential for automatic standby operation and are included on most of the larger whole-home packages, but not on the 14kW model. If you are adding a portable, a manual transfer switch lets you power hardwired circuits safely without backfeeding.
Safety: carbon monoxide and placement
Every portable generator in this list burns fuel and produces carbon monoxide. The CPSC and CDC agree that portable generators must be used outside, at least 20 feet from any window, door, or vent, and never in a garage or basement. CO is odorless and colorless, so a battery-powered CO alarm is mandatory in the home when a generator is running. The standby units are installed outdoors by professionals and usually include CO shutoff, but their exhaust still must be directed away from openings. Whatever you choose, follow the manufacturer's placement instructions and never connect a portable generator to your panel without a transfer switch.
Questions
What size Generac generator do I need to run a whole house?
A typical home needs anywhere from 10kW to 28kW depending on square footage and appliances. The 14kW model with cellular capability is the smallest standby here and covers essentials like lights, fridge, and a furnace. The 18kW, 22kW, and 24kW units add more headroom for central AC, electric water heaters, and dryers. A 28kW is best for very large homes with multiple AC units or heavy electrical loads. Use a load calculator to estimate your exact requirement.
Can I run a Generac generator on natural gas?
Yes, several Generac standby models run on natural gas, including all the Whole Home units in this list, which list natural gas as a fuel source but the seller does not explicitly state it for every model. The Protector Series 25kW is listed as dual fuel, meaning natural gas or propane. The two 12,500 watt tri-fuel portables also run on natural gas, propane, or gasoline. Check the specific model page for exact fuel requirements.
Are Generac generators safe to use indoors?
No. Never operate any portable generator inside a home, garage, basement, shed, or any enclosed area. The CPSC warns that generator exhaust contains deadly carbon monoxide that can kill you in minutes. Use portable generators outside at least 20 feet from windows, doors, and vents. Standby generators are installed outside in permanent locations. Always have a working CO alarm in your home.
What is the difference between a portable and a standby Generac generator?
A portable generator is wheeled or carried to the site, started manually, and connected via extension cords or a manual transfer switch. A standby generator is permanently wired to your home's electrical panel, starts automatically when the grid fails, and runs on natural gas or propane. Standby units are more expensive and require professional installation but provide seamless backup during an outage. Portables are cheaper and can be used for multiple purposes away from home.
Latest changes
- : First published.