Generac 26kW review
Generac 26kW Whole Home Standby Generator with 200-Amp Transfer Switch (7328)
By Tom Calder
Key specs
The maker's figures.
- Rated output (listing)
- 26,000 W
- Transfer switch
- 200 amp, included
- Fuel
- Propane (LP) or natural gas
- Weight
- 524 lb
- Warranty
- 5-year limited
The largest on this page: 26 kW and a 200-amp transfer switch, for a large home that wants central air and electric loads such as a water heater running together. On its listed rating, DTE Energy's figures for a 3-ton central air conditioner (18,000 watts to start) and a 50-gallon electric water heater (up to 5,000 watts) fit inside it with about 3,000 watts left for the essentials. It's also the heaviest at 524 pounds.
- Best for
- Large homes: central air plus electric appliances at once
- Skip it if
- Your house is mid-size
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Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- The most headroom in the range
- 200-amp transfer switch included
- Starts by itself on propane or natural gas
Worth knowing
- 524 lb: the biggest install
- Burns more fuel than you need if your loads are modest
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Our review
Generac's 26 kW whole-home standby generator is a permanently installed unit that starts itself on propane or natural gas and comes with a 200-amp automatic transfer switch. This researched review reads Generac's spec sheet for the 26 kW Guardian series, notes where it differs from the listing we track, and covers siting, fuel draw and CO safety.
What it is and who it suits
This is a standby generator, not a portable one. It is bolted to a pad outside, connected to your gas line and wired to the house through a transfer switch, and it starts without anyone standing next to it. Generac's spec sheet for the 26 kW Guardian series says the automatic mode starts the unit on a utility failure. The sheet we read covers models G007290 and G007291. The listing we track names model 7328 and a 200-amp switch, so this review treats the sheet as the closest Generac document, not a perfect match.
It suits a large home on propane or natural gas where a long outage means losing central air, a well pump or electric heat, and where nobody wants to haul fuel and cords. This review is researched, not tested. It relies on Generac's sheet, CDC and CPSC.
Output and fuel
The sheet lists a continuous rating of 26,000 watts on liquid propane and 22,500 watts on natural gas, and says maximum power drops about 3.5% for every 1,000 feet above sea level and about 1% for every 10°F above 60°F. So the 26 kW figure is the propane figure. At full load the sheet lists 132 cubic feet an hour of propane (3.63 gallons) and 333 cubic feet an hour on natural gas, so the gas line and any tank must be sized for full load.
The sheet lists a unit weight of 518 pounds, while the listing says 524. Either way it needs a pad and equipment, not two people and a dolly.
Transfer switch and installation
The sheet describes the 200-amp service rated switch as fully automatic, NEMA/UL 3R so it can be installed inside or outside, and ETL or UL listed. It also says the generator is UL 2200 listed. The gas connection uses a 14-inch flexible fuel line, and the sheet says the sediment trap meets IFGC and NFPA 54 installation requirements.
The sheet gives no step-by-step install instructions. Treat this as a job for licensed pros: a gas fitter for the fuel line and an electrician for the switch, with permits and your utility's rules. Our transfer switch comparison covers the portable-generator version of the same idea.
Siting and carbon monoxide
Generac says the unit is listed for installation as close as 18 inches to a structure, and adds that it must be located away from doors, windows and fresh air intakes and in accordance with local codes. Fixed does not mean harmless. CDC says never to use generators or other propane or natural gas devices inside the home, basement, garage or camper, or even outside near an open window, door or vent.
Keep battery-operated CO alarms on every level and outside sleeping areas, as CPSC advises. Our carbon monoxide poisoning guide explains the symptoms.
Noise, exercise and monitoring
The sheet lists 67 dB(A) at 23 feet at normal load and 57 dB(A) in its low-speed exercise mode. The unit runs a 5-minute exercise cycle, set to weekly, every other week or monthly. Generac lists Mobile Link Wi-Fi monitoring for status and maintenance alerts, and a 5 year limited warranty. A battery is required but not included.
How it compares with the other picks
On our whole-house generator comparison, the Generac 22kW lists 22,000 watts at 451 pounds and the 18kW lists 18,000 watts at 426 pounds, both with a 200-amp switch. The 10kW lists 10,000 watts at 384 pounds and does not give its switch amps. This is the largest and heaviest of the group.
Skip it if
Skip it if your house is mid-size and a smaller unit covers your loads, if you do not have a gas supply or a clear spot for the pad, or if you rent. For a lower-cost start, see the power outage checklist and the portable options in our home backup generator comparison.
A researched review, built from the maker's specs, manual and US listings; facts checked 2 Nov 2026. Sources: Generac: 26 kW Guardian Series residential standby generator spec sheet (G007290, G007291); CDC: Carbon monoxide poisoning basics; CDC: Natural disasters, safety; CPSC: Safety alert, portable generators.
Who shouldn't buy this
Don't buy it if your house is mid-size: the 22 kW covers central air with room to spare.
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the US price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for The essentials, automatically: fridge, furnace, well pump, lights and internet
See the comparison →Best for Most of a mid-size home, minus central air
See the comparison →Best for A whole home with central air
See the comparison →Questions
Is the 26 kW figure the same on natural gas?
No. Generac's spec sheet lists 26,000 watts on liquid propane and 22,500 watts on natural gas, so plan your loads on the lower number if you run on natural gas.
Does it need a separate transfer switch?
The listing says a 200-amp switch is included. Generac's sheet describes the 200-amp service rated switch as fully automatic and ETL or UL listed. Plan on licensed pros for the install.
Can a standby generator still cause carbon monoxide problems?
Yes. Generac says it must sit away from doors, windows and fresh air intakes, and CDC says never to run generators outside near an open window, door or vent. Keep working CO alarms in the home.
How loud is it?
Generac lists 67 dB(A) at 23 feet at normal load and 57 dB(A) at 23 feet in its low-speed exercise mode. Readings from other sides of the unit may be higher.