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Generac 7039 Guardian 20kW (LP) / 18kW (NG) Air-Cooled Standby Generator with Automatic 200SE Transfer Switch & Wi-Fi


Includes Mobile Link™ Wi-Fi Remote Monitoring - Monitor generator status on a smart phone, tablet or PC

SKU: 7039

Availability: In stock


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No Payment Until 2018



  • Generac's 20,000-Watt Guardian Series with Automatic Transfer Switch provides the automatic backup power you need to protect your home and family during a power outage
  • Connected to your existing LP or natural gas fuel supply, it kicks in within seconds of determining power loss automatically and runs for as long as necessary until utility power returns
  • Up to whole house protection with the 200-amp, NEMA 3R (aluminum outdoor enclosure) smart switch
  • 5 Year Limited Warranty for automatic standby generators
  • True Power™ Technology delivers best-in-class power quality with less than 5 percent total harmonic distortion for clean, smooth operation of sensitive electronics and appliances
  • Generac generators and engines are Engineered and Built in the USA - Assembled in the USA using domestic and foreign parts
  • Generac's G-Force Engine is a purpose-built, pressure-lubricated engine capable of handling the rigors of generator use, resulting in power that’s more reliable and requires less routine maintenance than any competitive engine
  • Quiet-Test Self-Test Mode runs at a lower RPM for a five or twelve minute test, making generators significantly quieter than other brands while consuming less fuel
  • Tough, Durable All-Aluminum Enclosures: The RhinoCoat™ powder-coated finish helps make corrosion-resistant aluminum perfect for all weather conditions

Compliance and Restrictions.

Warning: Cancer and Birth Defect/Reproductive Harm -- www.P65Warnings.ca.gov/product



Rated Max. Continuous Power Capacity (LP / NG) 20,000 Watts / 18,000 Watts
Rated Voltage 240V
Rated Max. Continuous Load Current - 240 Volts (LP / NG)       83.3 / 75
Total Harmonic Distortion Less than 5%
Main Line Circuit Breaker 100 Amp
Phase 1
Number of Rotor Polls 2
Rated AC Frequency 60 Hz
Power Factor 1.0
Battery Requirement (Not Included) 12 Volts, Group 26R 540 CCA Min. or Group 35AGM 650 CCA Min.
Unit Weight (lbs. / kg) 448 lbs. / 203 kg
Dimensions - L x W x H (in / mm) 48" x 25" x 29" / 1218mm x 638mm x 732mm 
Sound Output in dB(A) at 23 ft. Under Normal Load 66 dB(A)
Type of Engine Generac G-Force 1000 Series
Number of Cylinders 2
Displacement 999cc
Cylinder Block Aluminum with Cast Iron Sleeve
Valve Arrangement Overhead Valve
Ignition System Solid-State with Magneto
Governor System Electronic
Compression Ratio 9.5:1
Starter 12 VDC
Oil Capacity Including Filter (Quarts / Liters) 1.9 Quarts / 1.8 Liters
Operating Speed 3600 RPM
Fuel Consumption - Natural Gas 1/2 Load: 204 ft³/hr - Full Load: 301 ft³/hour
Fuel Consumpstion - Liquid Propane 1/2 Load: 2.37 gal/hr - Full Load: 3.56 gal/hr
Wi-Fi Remote Monitoring Yes

More Info


Excellent!!Review by Parrthd
All appliances (including computers) function as expected. I cannot think of anything negative to say except I should have had this installed sooner.
I can go into the winter knowing I will have heat and water no matter what." (Posted on 7/19/2015)
A great investment!Review by 9000 ft. above sea level
It's been one of our best decisions. The digital read out walks you through the steps clear and simple..... and maintenance is a breeze. This unit has been engineered with 'customers' in mind.... not mechanics. The piece of mind and security it provides are the best value for dollar I've seen in a long time. (Posted on 7/13/2015)
Peace of mindReview by Satisfied
We purchased this generator to provide basic operations for our home in case of a major power failure. To date we have been fortunate in that we have not had any major power failures. The generator tests itself every week as programmed and that gives us peace of mind. (Posted on 6/22/2015)
Peace of mindReview by justin31
This is one of the best investments i made, the shipping was fast, had my uncle hook it up who is a certified electrician only took him 4hrs and he said the electrical panel and parts were very well built. I lost power for an hr couple days ago fired right up and had no problems, exercise function works like it should I am a very pleased customer. (Posted on 5/12/2015)
This product is realiableReview by Willie52
Since owning our whole house generator it gives us piece of mind that we will never be without power. What a relief. We are now always prepared. (Posted on 4/17/2015)
a god-sendReview by Gayle F.
This generator is amazing. We change the oil every october and the process is very easy. We have had power outages because of ice storms or violent thunderstorms. We also have a sump pump and the generator lets us sleep easy when to water table is high and our pump is consistently running. WE are very happy with our purchase. (Posted on 3/23/2015)
Best features for the price...Review by MamaJo
We researched 3 major brands of generators and felt that Guardian provided the most product for the price. It's been a year now and OF COURSE we haven't lost electricity once!! ha ha. It goes through its cycle of maintenance every week, so I know it's ready to kick in when needed. I love the peace of mind it gives me. We lost electricity for 3 days a couple summers ago when it was in the 90s and had to empty/transport 3 freezers of food to safety at different homes. I NEVER want to do that again, not fun! Thank you, Guardian. I hope I can eventually tell you how your product actually works! (Posted on 3/7/2015)

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