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Generac Guardian 6245 - ™ 8kW Home Standby Generator for sale.

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Generac Guardian™ 8kW Home Standby Generator

(Based on expert analysis, manufacturer ratings and customer reviews)
3.3 out of 53.3 out of 53.3 out of 53.3 out of 53.3 out of 5
7 Reviews
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Ships Wednesday, Oct 26th

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  • Features
  • Specs
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Airooled Standby Generators
8 kW
Rated Watts
120/240 Single-Phase

Product Video Disclaimer: "PED is not responsible for any variances from the product in this video and the item you purchase. Please review all product specs prior to purchase."

Fully Automatic Operation When Paired With Genearc Smart Switch™

Generac OHVI Air-Cooled Engine
Features plateau honed cylinder walls and plasma-moly rings
Full pressure lubrication system w/ 2 year oil change interval
Aids in cooling the engine for longer life

Operates On Clean Burning, Efficient Natural Gas or LP (Vapor)

Skewed Rotor Design For Smooth Output Waveform "Clean Power"
Automatic voltage regulator equipped for +/- 1% regulation

Evolution™ Digital Controller Monitors & Controls All Functions
Provides system status for wireless monitors & Mobile Link™

Sound Attenuated Weather Proof Enclosure
Attractive styling with lockable access doors
Incorporates electrostatically applied epoxy paint technology
Sound dampening enclosure limits sound pressure to a low 62dB(A)
12" flexible fuel line and manual included

Built-in Battery Charger (Battery Sold Separately)

Automatic Transfer Switch - ATS (Sold Separately)
Select the ideal ATS & PMM™ modules for load shed capabilities

Automatic Operation Only & Listed to UL2200 Standards For Safety

5-Year Limited Warranty & 24/7/365 Customer Care
Engine Brand
Generac OHVI
410 CC
Consumer Engine Warranty
5 Years
Commercial Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Product Specs
120/240 Single-Phase
60 Hertz
Surge Watts
8000 Watts
Rated Watts
8000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
7000 Watts
LP Power Capacity
8000 Watts
NG Fuel Consumption @ 50% Load
77 (BTU: 77,000 BTU/HR) ft3/hr
NG Fuel Consumption @ 100% Load
121 (BTU: 121,000 BTU/HR) ft3/hr
LP Fuel Consumption @ 50% Load
0.94 (BTU: 85,305 BTU/HR) gallons/hr
LP Fuel Consumption @ 100% Load
1.42 (BTU: 128,865 BTU/HR) gallons/hr
Rated Amps
33 @ 240 Volts (Single Phase) Amps
Decibel Rating @ 7m
62 dbA
Transfer Switch
Automatic (Not Included)
Not Included (525 CCA)
Cooling System
Air Cooled
UL Listed
Made in USA
340 Pounds
Product Length
48 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
5 Years
Commercial Warranty
5 Years

*Ask Mike about the Generac Guardian 6245. Sorry, no repair questions:




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  6 Questions
Q: I'm interested in the Generac 14 kw standby generator and I want to power it with natural gas. All your other Generac standby generators show a wattage loss of about 2kW when powered with natural gas, but this one does not show a loss in the specs I have reviewed. Is this a misprint in the specs or is this a true output? If I power it with natural gas will it deliver 12 kW or 14 kW?
by Albert Leblanc from Michigan on May 06, 2014

A: This is not a misprint in the specification. The unit will produce 14kW when operating on Natural Gas and LP as tested at the factory.

Also noted on the manufacturers specification sheets is the following....

"Maximum wattage and current are subject to and limited by such factors as fuel BTU/megajoule content, ambient temperature, altitude, engine power and condition, etc. Maximum power decreases about 3.5 percent for each 1,000 feet (304.8 meters) above sea level; and also will decrease about 1 percent for each 6° C (10° F) above 16° C (60°F)."

Specification sheets can be found on the individual product pages under the Specs tab and within the download document section.

by Mike, Product Expert
Q: Is It possible to install a Generac 8kW generator (model # 6245) with a Reliance Q510C transfer switch and only run it in manual mode when needed?
by Bob N. from Pennsylvania on January 29, 2014

A: All of the permanent home standby systems are automatically operated only and cannot be connected to any type of manual transfer switch. The generators internal controller must be connected to the appropriate automatic transfer switch for it to operate properly otherwise the controller will error and any connection or use with a manual switch or manually operated will void the manufactures warranty for improper installation and use.

The only available option for manual generator use is with a portable generator.

by Mike, Product Expert
Q: Jim, I am in the process of putting in a 16 x 80 mobile home for a hunting camp. I'm having it built. It will be all gas ( stove, oven, heat, ) electric hot water heater and 3 ton a/c and normal lighting. There is no power at this location. Going to run power with generator. I have a 45kw backup generac at my home. I'm wanting to use a generac to run my camp. Would it work and what size would you recommend? It will run off of propane. Thanks, Scott M.
by Scott Menotti from Mississippi on January 19, 2014

A: The Generac standby units are for emergency backup power only and must be tied to a utility source for them to operate properly and to maintain their warranty. The generators internal controller needs to have utility power present to operate properly otherwise the system will error.

We currently do not offer any "Primary" or "Prime" power type generators. A prime power generator must be 1800 RPM and liquid cooled. Any air cooled or 3600 RPM generator is a standby generator only. If you attempt use a standby generator in a prime power situation the generators life expectancy can be shortened considerably and the potential for premature failure is increased dramatically.

The only options we offer for prime use would be a "Professional" portable generator or a tow behind unit (diesel) that is classified for "Prime" power.

by Mike, Product Expert
Q: Jim I have a 100 amp Pre-Nexus service rated transfer switch. Can I use this with a nexus generator? I've heard there is some special wiring for the battery charger to work
by J. Depp from California on November 04, 2013

A: Thank you for your interest in Electric Generators Direct!

There is a special kit that needs to be added to the switch to accept the 120V connection which provides the power to the internal generator controller for the charger. These kits are available from your local Generac dealer - Part Number: 0H92540SRV.

by Mike, Product Expert
Q: Hi,

I am considering a purchase of 8Kw Generac.

What does it mean by off-the-grid environment? How will I know if my house is also off-the-grid ?


by Pramod Gadilkar from New Jersey on October 15, 2013

A: Thank you for your inquiry!

The term off-grid refers to not being connected to a grid, mainly used in terms of not being connected to the main or national transmission grid in electricity. In electricity off-grid can be stand-alone systems (SHS) or mini-grids typically to provide a smaller community with electricity.

If your home does not receive power from a utility company, then you are considered to be off-grid.

by Mike, Product Expert
Q: Can the Nexus 200 amp Smart Switch be installed with a smaller (8KW) generator? We may be limited to the smaller generator due to propane supply issues, but love the load shedding concept.
by Jim White from Connecticut on May 12, 2013

A: Typically a smaller 8000 watt generator does not have the output capacity to handle a whole house application even when using the load control manager. The constant turning on and off equipment that the generator will never be able to run can be extremely harmful to the generator and to your equipment such as your AC or other larger loads.

We recommend consulting with a certified electrician to properly size the generator based on your actual needs and equipment in your home.

Yes, you can use the whole house switch but it is not recommended with a 8000 watt generator which is why manufacturers do not prepackage them together.

The 10kW unit is the largest prepackaged model that includes the whole house transfer switch but is also available with a select circuit.

by Mike, Product Expert
Generac Guardian 6245 Reviews & Ratings
Overall Rating
3.3 out of 53.3 out of 53.3 out of 53.3 out of 53.3 out of 5
Price (2)
If You Get A Good One It... (1)
All With Elec Gen Direct... (1)
Light Weight (1)
None (1)
If You Get A Bad One It'... (1)
50 Ways To Deny Any Refe... (1)
Unreliable Warranty Supp... (1)
No Real Product Support ... (1)
Durability (1)
43% of respondents would recommend this product to a friend
7 Reviews  Sort by 
Randy W.
Essex Junction, VT
Most Helpful Critical Review
2 out of 52 out of 52 out of 52 out of 52 out of 5
Dead In 5 Years
Bought this new from here in 2011. Had a professional certified electrician install it along with standby transfer case. Had it yearly maintenance by an authorized dealer/service. Year 2016 it failed and the annual service confirm engine is shot. Less than 100hrs total which includes 10hrs/year self check run and no more than 16hrs of continuous operation when I did need it. Called Genarac and they said not under warranty ( I knew that) but their comment that 'well, it is a machine' says... more
Randy Does Not Recommend This Product
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Stephan C.
Port Washington, NY
Purchased from Power Equipment Direct
Purchased 9/17/13
Total Helpful Votes
70 Helpful Votes
1 out of 51 out of 51 out of 51 out of 51 out of 5
Don't Even Think About Purchasing This Generac Generator-8kw
From the moment we started it, shut off after 10 minutes due to low oil pressure. Called Generac certified technician and said we needed a new motor! Really?!?!?! How about a new generator altogether!!! Would you buy a new car and being told after 3 weeks that it needs a new motor? I don't think so. Now, we are stuck with this defective generator.

I am going further with is. Best of all, after doing online research, I have read more complaints and problems with other consumers with... more
Pros: None
Cons: Low Quality, Difficult To Use, Unreliable, Durability
Stephan Does Not Recommend This Product
Mike, the Generator Expert
Product Expert
The good thing is that Generac does stand by their products. A technician that immediately states the motor is bad should not be the guy checking the unit. A recommendation would be to contact a different certified Generac technician for a second opinion.
Was this review helpful?
Gilbert N.
Pensacola, FL
Purchased from Power Equipment Direct
Purchased 9/3/13
Total Helpful Votes
40 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Buying Direct Saved Me A Lot
I am delighted I chose to buy a unit from Elec. Gen Direct- easy to get info to gain info on what I needed to order-very quick shipping time--4 days from the time I picked up the phone to place the order until the unit was setting on my property in Sapphire, NC. Buying direct saved me a lot of money and time in getting my generator installed and running in 7 days from the first time I called Elec. Gen. Direct. I was a contractor and gave the same kind of service and giving good service &... more
Pros: Price, Light Weight, Fast, All With Elec Gen Direct Was Excellent In Giving Us What We Ask
Gilbert Recommends This Generac Guardian Product
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Pat M.
Ogdensburg, NY
Purchased from Power Equipment Direct
Purchased 2/14/15
Total Reviews
3 Reviews
Total Helpful Votes
19 Helpful Votes
3 out of 53 out of 53 out of 53 out of 53 out of 5
Off To A Bad Start
The very first disappointment was with the "$50/$50 Protect Your Neighbor REFERRAL REBATE" as it seems GENERAC doesn't like the purchase receipt issued by Electric Generators Direct. A fact that I shared with them was that, that's a problem you have to settle with Generators Direct. (Or as I saw it, their form letter can be viewed as "any excuse for not paying is a good excuse." )

The second disappointment was when I fired up this bad boy just to have it start and then... more
Pros: Price, If You Get A Good One It's Normally Real Good
Cons: No Real Product Support From Generac, If You Get A Bad One It's Normally Real Bad, 50 Ways To Deny Any Referral, Unreliable Warranty Support
Pat Does Not Recommend This Product
Manufacturer Response
Brand Rep
We apologize for any confusion that has come about regarding the referral rebate. Please note that as long as the proper documentation is submitted along with receipt(s) displaying the purchase date and price of the products purchased, a receipt from EGD should suffice.

Also, please note that we recommend referring to our independent authorized service providers if/when issues are experienced, as these professionals are trained to not only determine the cause of a unit's issues, but to also provide any applicable warranty coverage as well. Unfortunately, we are unable to determine what has caused your unit's issues via online correspondence.

Lastly, if you would like to discuss these issues with us directly, or if you have any additional comments, questions, or concerns, please do not hesitate to contact us directly at 888-GENERAC (436-3722). We apologize for any inconvenience that your personal experience may have caused.
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Stephen S.
Woodway, TX
Purchased from Power Equipment Direct
Purchased 1/15/15
Total Helpful Votes
11 Helpful Votes
4 out of 54 out of 54 out of 54 out of 54 out of 5
Standby Generac Generators
My purchase of the Model 6245 Generac Generator is my second purchase from Generac. My use of this generator was intended to be used in conjunction with a solar powered system for my barn. When the Generac dealer was there removing the old Generac Generator, I was informed I had ordered the wrong generator. The Model #6245 is a standby residential generator that is designed and wired to be hooked up to a house using 110AC current. Apparently, the wiring for the controller is different on... more
Stephen Does Not Recommend This Product
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Richard M.
Mendocino, CA
Purchased from Power Equipment Direct
Purchased 12/1/14
4 out of 54 out of 54 out of 54 out of 54 out of 5
Great Price, Good Product, & Some Advice...
The truck came at a break in the Big Storm we were having in Northern California. I tarped the whole crate until the weather cleared. It rained for ten days. I removed the old Gen. and set the new one.

The 100A Transfer Switch was under the deck and so is the new one, The existing six small wires were perfect for the job.
I mislabeled a wire in the Transfer Switch as it was dark under there, a Black and a Brown. I had discovered that mistake after talking on the phone with the local... more
Richard Recommends This Generac Guardian Product
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Ron M.
Columbiaville, MI
4 out of 54 out of 54 out of 54 out of 54 out of 5
Power If You Need It
After years of frequent power outages, and last Christmas' ice storm leaving us with no power for eight days and a few after, I'm tired of getting, pouring ,and smelling of gas. I finally said "enough."

I had it installed, it starts each week, and I hope I never have to use it, but I'll have power if I need it. Get a good installer.
Ron Recommends This Generac Guardian Product
Mike, the Generator Expert
Product Expert
On our site, we offer assistance with finding reliable installers in your area. To learn more, go to LOCAL GENERATOR INSTALLERS
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Free Freight
  • Ships via Semi-Truck
  • Requires a loading dock or forklift
  • Free to Lower 48 States
We currently CANNOT ship this product to Alaska, Hawaii or any destination outside of the United States
Priority Shipment
  • Faster Delivery Times
  • Ships Same Business Day
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  • $50 Service Charge
Lift Gate Services
  • Safely Lowers Products Off the Truck
  • Requires Special Hydraulic Lift
  • Free Lift Gate
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Buy Generac Guardian™ 8kW Home Standby Generator at Power Equipment Direct. Read standby generator reviews and standby generator articles. Wide Selection of standby generator accessories available, including GenPad™ Standard 3" Composite Cement Pad for Generac 8kW-22kW, Generac 6212 - Cold Weather Kit for Air-Cooled Home Standby Generators and Generac Full Synthetic 5W30 Engine Oil (12 Quart).

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