The Generac 28kW is Generac's largest current air-cooled home standby generator, producing up to 28kW on liquid propane and 25kW on natural gas. It is built for homes with larger electrical loads, but 28kW is not automatically the right size just because a house is large.
As of September 29, 2026, Generac sells the current 28kW in two main configurations:
| Model | What You Get | Starting MSRP |
|---|---|---|
| Generac 7282 | 28kW generator only | $8,159 |
| Generac 7329 | 28kW generator, 200A automatic transfer switch and ecobee by Generac thermostat | $9,509 |
The older Generac 7291 is not the current 28kW model. It is a previous-generation 26kW generator rated at 26kW on propane and 22.5kW on natural gas.
That distinction matters when comparing specifications, prices and replacement parts online.
For the specification overview, see our Generac 28kW model guide. This page answers the buying and ownership questions in more detail.
Price and model context: Equipment prices are U.S. starting MSRPs checked September 29, 2026; installed-cost ranges are planning estimates, not local quotes. Confirm your model, generation and serial-number manual before ordering parts or servicing.
Generac 28kW Specs at a Glance
| Specification | Generac 28kW |
|---|---|
| Maximum output on propane | 28kW / 116A |
| Maximum output on natural gas | 25kW / 104A |
| Engine | Generac G-Force 1000 / 997cc class |
| Fuel | Natural gas or liquid propane |
| Natural gas use at 50% load | 182 ft³/hr |
| Natural gas use at 100% load | 297 ft³/hr |
| Propane use at 50% load | 2.23 gal/hr |
| Propane use at 100% load | 3.97 gal/hr |
| Normal operating sound | 67 dBA at 23 ft |
| Exercise sound | 55 dBA at 23 ft |
| Dimensions | 46.4 × 26.3 × 30.7 in |
| Weight | 524 lb |
| Controller | Power Zone 200 |
| Warranty | 5-year limited |
| Battery required | 12V AGM BTX20L, 310 CCA minimum |
The headline number is 28kW, but remember that the generator reaches that output on propane. On natural gas, its maximum continuous rating is 25kW.
Source: Generac 7282 specifications.
Who Is the Generac 28kW Actually For?
The Generac 28kW makes the most sense when a home has enough simultaneous electrical demand to justify the additional capacity.
That can include homes with multiple central air-conditioning systems, heat pumps, a well pump, pool or spa equipment, larger kitchen loads, EV charging or other equipment that may operate during an outage.
Square footage alone is a poor way to size it.
A relatively large home with gas heat and modest electrical demand may need less than 28kW. A smaller all-electric home with multiple HVAC compressors and resistance heat can need considerably more capacity than its floor area suggests.
The useful calculation is:
running load + the largest significant starting load + reasonable operating margin.
This is particularly important with HVAC. Compressors can produce a substantial starting surge, while electric resistance backup heat can add tens of thousands of watts if it is allowed to operate normally.
Use a generator sizing calculation to narrow the range, then have the final system confirmed against the actual electrical loads and the generator's output on the fuel you intend to use.
How the 28kW Compares With Other Generac Options
Generac 28kW vs. 22kW, 24kW and 26kW
The current 22kW through 28kW Generac air-cooled lineup shares much of the same physical platform.
The 28kW does not give you a dramatically larger enclosure. It gives you more available electrical output from a package with a similar footprint.
That makes the 28kW interesting when a load calculation lands just beyond the comfortable range of a 22kW, 24kW or 26kW unit.
It does not mean bigger is automatically better.
An oversized generator costs more to purchase, requires adequate fuel delivery and does nothing useful if the additional capacity is never needed.
Generac 28kW vs. the Older Generac 7291
The model numbers are easy to confuse.
The 7291 is an older 26kW Guardian model, while the current 28kW products are the 7282 and 7329.
The newer 28kW generation adds features including the Power Zone 200 controller, cellular connectivity, electronic fuel and ignition control and electronic oil-level monitoring.
Check the actual model number whenever you are comparing online listings. A page mentioning "7291" is describing the older 26kW platform, not the current 28kW generator.
Generac 28kW vs. a Liquid-Cooled Generator
The 28kW is the top end of Generac's air-cooled residential range.
Larger liquid-cooled generators are a different class of machine. They become more relevant when electrical demand exceeds what the air-cooled platform can comfortably support, when very long runtime is a major design priority or when the application calls for heavier-duty equipment.
They also come with a substantial jump in equipment and installation cost.
For many homes sitting near the upper end of air-cooled sizing, the real decision is therefore not simply "26kW or 28kW." It is whether the home still fits comfortably within an air-cooled system at all.
What Size Home Will a Generac 28kW Support?
A Generac 28kW should be sized from the home's electrical load, not from square footage alone.
It is commonly considered for larger homes and for properties with multiple significant loads such as two or more HVAC systems, a well pump, pool equipment, EV charging or electric heating.
A 4,000-square-foot home might justify 28kW, but another 4,000-square-foot home may not.
The biggest trap is electric heat.
Two air-conditioning compressors can be manageable when their starts are controlled. Several stages of electric resistance heat operating simultaneously can radically increase the required generator capacity.
The final calculation should account for the loads you expect to run, their normal wattage, motor-starting demand and whether load-management equipment will prevent certain large loads from operating together.
Bottom line: don't buy a 28kW because of the size of the house. Buy it because the load calculation gives the extra capacity a job to do.
How Much Does a Generac 28kW Cost Installed?
The generator itself currently starts at $8,159 for the 7282 or $9,509 for the 7329 package, but a complete installation can cost substantially more.
Installation may include the transfer equipment, electrical wiring, fuel piping, generator base, trenching, permits, inspections, startup and any upgrades required to the gas or electrical service.
The September 2026 research for this guide found published turnkey examples for larger Generac systems ranging from the low-to-mid teens into $20,000+, including one Texas estimate of approximately $17,300 to $22,100 for a 28kW installation.
That should be treated as a planning range, not a national price.
A generator sitting close to an adequately sized gas meter and electrical service is a very different installation from one requiring a long trench, upgraded gas meter, panel modifications and significant site work.
When comparing quotes, compare the scope rather than just the final number.
A useful 28kW quote should make it clear which model is supplied, which transfer switch is included, what fuel and electrical work is included, whether permits and startup are covered and which site-specific upgrades remain excluded.
Source: Generac equipment MSRP listings.
Can I Install a Generac 28kW Myself?
Homeowners can perform some site preparation, but Generac strongly recommends professional installation of a home standby generator.
A 28kW standby generator becomes part of both the home's electrical system and its fuel system.
The electrical connection, automatic transfer equipment and natural-gas or propane installation must meet applicable codes, and permits and inspections are commonly required.
The warranty also matters.
Generac's five-year warranty applies to permanently wired and mounted systems and requires registration plus records showing required maintenance has been performed. Warranty concerns must be evaluated through an Independent Authorized Service Dealer.
If you want to reduce project cost, discuss which site-preparation work can legitimately be completed before the electrician or generator installer arrives rather than treating the complete installation as a DIY project.
How Much Fuel Does a Generac 28kW Use?
The Generac 28kW uses 182 cubic feet of natural gas per hour at 50% load and 297 ft³/hr at full load. On propane, it uses 2.23 gallons per hour at 50% load and 3.97 gal/hr at full load.
| Generator Load | Natural Gas | Propane |
|---|---|---|
| 50% load | 182 ft³/hr | 2.23 gal/hr |
| 100% load | 297 ft³/hr | 3.97 gal/hr |
At the published full-load propane consumption rate, the generator would burn roughly 95 gallons in 24 hours.
Real outage consumption is normally lower than simply multiplying the full-load figure because a home's demand rises and falls throughout the day.
That is why propane runtime should be estimated from both usable tank capacity and expected generator load, rather than tank size alone.
Natural-gas owners do not have the same finite-tank runtime problem, but the utility service, meter, regulator and piping still have to deliver enough gas when the generator and the home's other gas appliances are operating.
Source: Generac 7282 specifications.
What Transfer Switch Comes With the Generac 28kW?
The Generac 7329 package includes a 200A service-entrance-rated automatic transfer switch with whole-home surge protection.
The enclosure is suitable for indoor or outdoor installation, and the system can support load management when the home has more potential electrical demand than the generator should carry simultaneously.
That distinction between models is important:
7282 = generator only.
7329 = generator plus 200A transfer switch and ecobee by Generac thermostat package.
For a typical home with one 200A electrical service, the bundled switch may be a straightforward fit.
Homes with multiple panels, multiple service disconnects, 400A service or unusual electrical layouts may need additional transfer equipment or a different design.
The transfer switch should therefore be selected from the actual electrical service arrangement, not simply because a bundle is available online.
Does the Generac 28kW Include a Battery?
No. Plan on supplying a separate 12V AGM powersport starting battery.
The current specification calls for:
Group BTX20L, 12 volts, 310 CCA minimum.
This is one of the small items buyers often discover late because the generator itself is a large, expensive piece of equipment but the starting battery is not included with the package.
The generator does include its composite mounting base. Whether additional gravel, a prepared pad or concrete work is required depends on the installation site and local requirements.
Add the battery to your installation checklist so it does not become a commissioning-day surprise.
Source: Generac 7282 specifications.
Does the Generac 28kW Need a Fuel Conversion Kit or a Larger Gas Meter?
The Generac 28kW can be configured for natural gas or liquid propane without purchasing a separate fuel-conversion kit.
The installer sets the generator up for the fuel being used.
The available output changes with fuel:
Liquid propane: 28kW / 116A
Natural gas: 25kW / 104A
For natural gas, the bigger issue is often not conversion but delivery capacity.
At full rated load, the generator alone can require 297 cubic feet of natural gas per hour.
The gas system also has to account for anything else using the same service, such as furnaces, water heaters, fireplaces, dryers or cooking appliances.
That means an installation may require a meter upgrade, regulator change or larger gas piping depending on the existing system, pressure, pipe length and total connected load.
Don't assume that because a house already has natural gas, the existing gas service can automatically support a 28kW generator.
Have the fuel system checked before the installation price is treated as final.
Source: Generac 7282 specifications.
Can a Generac 28kW Run for Several Days During an Outage?
Yes, a Generac 28kW is designed for extended automatic operation, but extended operation does not mean maintenance-free operation.
For continuous outages, Generac's current guidance calls for the generator to be shut down after every 24 hours of continuous runtime for at least 30 minutes so the owner can check the oil level, inspect fuel and oil connections and clear debris from the enclosure.
Normal service intervals still accumulate while the generator is running.
The Next Generation air-cooled schedule includes an oil and filter service at 200 operating hours or two years, with additional service at 400 hours. Generators operating continuously below 40°F or above 85°F can require oil and filter changes every 100 hours.
The 28kW also includes protective shutdowns and oil-level monitoring, but those systems do not replace inspection and maintenance.
For a multi-day outage, think in terms of both:
Can I keep supplying fuel?
and
Can I safely maintain the generator while it is running this much?
Those are separate questions.
Source: Generac continuous-use guidance.
How Often Does the Generac 28kW Exercise, and How Loud Is It?
The Generac 28kW normally exercises for five minutes and is rated at 55 dBA during exercise and 67 dBA at normal load, measured at 23 feet.
The Power Zone 200 controller supports weekly, bi-weekly and monthly exercise scheduling.
Exercise duration can be adjusted from 5 to 20 minutes on the Power Zone 200 system, although some remote exercise controls depend on the Mobile Link plan being used.
The generator normally performs this exercise without transferring the house onto generator power.
For homeowners worried about neighbours or placement near bedrooms, exercise sound is only part of the question. The 67 dBA normal-load rating is the more relevant number during an actual outage.
Distance, walls, fences, reflective surfaces and where the generator sits relative to neighbouring homes will change how loud it seems in practice.
Placement therefore matters for both code compliance and quality of life.
What Warranty Does the Generac 28kW Have?
The Generac 28kW carries a five-year limited warranty, with coverage becoming narrower after the second year.
The current warranty schedule is:
| Period | Standard Coverage |
|---|---|
| Years 1–2 | Parts, labor and limited travel |
| Year 3 | Parts only |
| Years 4–5 | Major engine and alternator components only |
For years four and five, major-component coverage is limited to items including the engine short block and alternator rotor and stator.
The system must be properly activated and registered, and proof of required maintenance must be available.
This is another reason to keep generator servicing documented rather than relying on memory several years later.
Extended warranty products may also be available, so compare both the length of coverage and what is actually covered during each year.
Is Generac Mobile Link Free on the 28kW?
Yes. Generac offers a free Mobile Link Basic plan, while additional monitoring and control features are available through paid Premium plans.
As of September 2026, Generac lists Single Generator Premium at $5.49 per month or $54.99 per year when purchased through the web.
The equivalent app-store subscription is currently $7.49 per month or $74.99 per year.
The current 28kW Next Generation models include cellular connectivity, with Wi-Fi and Bluetooth capabilities.
One important detail for the newer Next Generation platform is that generator status monitoring is currently handled through the Mobile Link mobile app. The website can still be used for account and subscription management, but it does not currently provide the same browser-based status monitoring for these generators.
You do not need a paid Mobile Link subscription for the generator to function as an automatic standby generator.
Source: Generac Mobile Link plan details.
Our Take: When the 28kW Is Worth Paying For
The Generac 28kW is most compelling when the load calculation genuinely lands near the top of the air-cooled range.
If a 22kW or 24kW generator comfortably covers the loads you actually intend to run, buying the 28kW simply because it is the biggest model adds cost without solving another problem.
If you're trying to support multiple HVAC systems, pumps and several other large loads while keeping an air-cooled installation, the extra capacity can be much more useful.
The natural-gas derating deserves particular attention.
A buyer comparing generators by the model number alone may assume "28kW" means 28kW regardless of fuel. It does not. If the system will operate on natural gas, size the home against the 25kW natural-gas rating.
And if the load calculation is already pushing beyond that figure, don't force the project into a 28kW air-cooled generator simply because the price is attractive.
That may be the point where load management or a larger liquid-cooled system deserves a serious comparison.
Related Generac Guides
Sources and Model Verification
The model, output, fuel-consumption and battery details were checked against the manufacturer sources below on September 29, 2026. Current and Guardian models are identified separately because their specifications can differ. The installed-cost examples in this guide are estimates and should be checked against itemized local quotes.