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FREE SHIPPING — Generac Guardian Air-Cooled Standby Generator — 20kW (LP)/18kW (NG), 200 Amp Service-Rated Smart Switch, Model# 6729
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FREE SHIPPING — Generac Guardian Air-Cooled Standby Generator — 20kW (LP)/18kW (NG), 200 Amp Service-Rated Smart Switch, Model# 6729

Item# 45336

Only $4409.00

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Factory Shipped —
Estimated Delivery: 5 - 10 Business Days
Free Shipping  (lower 48 states)
Ships Truck 251.0 lbs
Unloading Requirements
Not Available in Stores
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Product Summary


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This Generac Guardian Series Standby Generator protects your home automatically 24/7. Runs on natural gas or liquid propane (LP) fuel, and sits outside just like a central air conditioning unit. No refueling, no manual starting and no extension cords. Delivers power directly to your home’s electrical system, backing up your entire home or just the most essential items. Add even greater convenience with a Mobile Link (not included), Generac’s cellular remote monitoring system. Tool-less fuel conversion, external main circuit breaker, system status LED, and external GFCI outlet. Mobile Link and remote monitoring systems available, sold separately.

What's Included

  • (1) 16kW generator, Model# 6729
  • (1) 200 Amp service-rated Smart Switch
  • (1) Composite mounting pad
Tough. Reliable. Purpose Built.

Tough. Reliable. Purpose Built.

Robust Performance

The next power outage in your neighborhood could last days or even weeks. The Generac Guardian® Series 20kW/18kW Air-Cooled Automatic Standby Generator is standing by, ready to deliver with extended run times and clean, smooth performance.

Generac OHVI® Engine

The Generac OHVI engine is made to go the distance, providing the reliability to power through the most severe situations. What sets the Generac OHVI apart is that it is made specifically for generators and is engineered to run for long periods of time. The Generac OHVI offers increased fuel efficiency, a cooler running engine and reduced oil consumption.

Best-in-Class Power and Convenience

Utility-Grade True Power™

When it comes to electricity, quality matters. Generators that produce electricity with higher distortion levels do not allow electronic appliances to run properly. The Generac Guardian® Series 20kW/18kW Air-Cooled Automatic Standby Generator features less than 5% total harmonic distortion, allowing you to use essential electronics and appliances with no hassles and no interruptions.

Evolution™ Controller

This dual-line multilingual LCD display gives you the best of both worlds: advanced technology and a simple-to-use design. Monitor history and maintenance logs at a glance. Plus, the built-in hour meter makes it easy to monitor run times, determine maintenance intervals and can also trigger reminders.

Quiet-Test™ Mode

Feel confident your Generac Guardian® Series 20kW/18kW Air-Cooled Automatic Standby Generator is ready to go when you need it. The Quiet-Test mode runs weekly self-tests at a lower RPM. Quiet-Test is quieter and consumes less fuel.

Tool-Less Fuel Conversion

Need to switch fuels on the fly? No problem. The Generac Guardian® Series 20kW/18kW Generator allows you to easily switch between natural gas and LP fuels in the field without the need for tools.

Best-in-Class Power and Convenience
Easy to Install, Built to Last

Easy to Install, Built to Last

Includes Mounting Pad and Pre-Wired Transfer Switch

The Generac Guardian® Series 20kW/18kW Generator offers installation flexibility with an intelligent pre-wired transfer switch, re-engineered connection points, and composite mounting pad that eliminates the need for a poured concrete base. In addition, this Generac generator can be installed as close as 18" from a building (unless required by local codes) for optimal placement.

Tough, Durable Enclosures

High winds, heavy rain and blowing snow. The rugged steel enclosure can withstand them all. For an extra measure of protection, the ultra-tough Rhino Coat® paint finish provides exceptional durability and corrosion resistance, making it suitable for any climate.

5-Year Limited Warranty, Built in U.S.A.

Engineered and built in America, Generac generators give you peace of mind and the power to live. Generac stands behind their products with a 5-year limited warranty.

Northern Tool + Equipment — #1 Source for Generators

Generac Power Solutions

For over 50 years homeowners and business owners have trusted Generac for innovative and reliable power solutions. Northern Tool + Equipment carries a full line of Generac generators, from portable and automatic home standby generators to backup systems for commercial and industrial applications. Find the Generac solution for your needs at Northern Tool + Equipment.

5-Year Limited Warranty, Built in U.S.A.

Features + Benefits

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Features for FREE SHIPPING — Generac Guardian Air-Cooled Standby Generator — 20kW (LP)/18kW (NG), 200 Amp Service-Rated Smart Switch, Model# 6729
  • Includes 200-Amp service-rated Smart Switch
  • Generac OHVI® engine is designed to run for extended periods, ensuring reliable, uninterrupted power
  • Generac's Evolution Controller features a dual-line, improved multilingual LCD display for easy monitoring and management of generator functions, built-in hour meter and external at-a-glance indicator lights
  • Install as close as 18in. to home as certified by NFPA standards or directed by local codes
  • True Power™ technology provides clean, smooth operation of sensitive electronics and appliances
  • Quiet-Test™ weekly self-test mode runs at lower RPM, is quieter and consumes less fuel
  • Sturdy, all-weather steel enclosure
  • Tool-less fuel conversion with swivel-action fuel selector dial allows for easy switching between natural gas and LP fuels
  • Mobile Link™ compatibility for adding Mobile Link wireless remote monitoring system to receive status updates using your computer, tablet or smart phone
  • Battery required, not included
  • 24/7 Generac customer care support 365 days a year
  • Engineered and built in U.S.A.
  • 5-year limited warranty

Key Specs

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Item#45336
Ship Weight251.0 lbs
Rated Watts (kW)20 LP/18 NG
Amps83.7/75
Rated Watts LP (kW)20
Rated Watts NG (kW)18
EngineGenerac OHVI
Engine Displacement (cc)999
Volts120/240
Engine CoolingAir cooled
Start TypeAutomatic
PhaseSingle
Noise Level (dB)66
Transfer Switch200A Smart Switch
Fuel TypeLiquid propane, natural gas
EnclosureAll-weather steel
Mounting PadYes
Battery RequiredYes
Battery IncludedNo
Auto ShutdownYes
Safety AlertsYes
UL ListedYes
Dimensions L x W x H (in.)48 x 25 x 29

Customer Reviews

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Product Question + Answer

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Hide Similarities
Rated Watts (kW)
8 LP/7 NG 11 LP/10 NG 20 LP/18 NG 30 LP/29 NG 45
Amps
33.3 LP/29.2 NG 41.6 LP/37.5 NG 83.7/75 125 LP/120.8 NG 187.5
Rated Watts LP (kW)
8 11 20 30 45
Rated Watts NG (kW)
7 10 18 29 45
Engine
Generac OHV Generac OHVI Generac OHVI 1.5L Generac automotive-style in line 4-cylinder Generac 2.4L 4-cylinder automotive-style in-line 4-cylinder
Engine Displacement (cc)
410 530 999 1,600 2,400
Engine Speed (RPM)
- - - 3,600 3,600
Volts
120/240 120/240 120/240 120/240 120/240
Engine Cooling Air cooled Air cooled Air cooled Liquid Liquid
Start Type
Automatic Automatic Automatic Automatic Automatic
Phase
Single Single Single 1 1
Noise Level (dB)
66 63 66 75 73
Transfer Switch 50A w/10 circuits 200A service rated Smart Switch 200A Smart Switch Not included Not included
Fuel Type LP or NG LP/NG Liquid propane, natural gas Liquid propane, natural gas Liquid propane, natural gas
Enclosure All-weather steel All-weather steel All-weather steel Steel Steel
Mounting Pad Yes Yes Yes No No
Battery Required Yes Yes Yes Yes Yes
Battery Included No No No No No
Auto Shutdown Yes Yes Yes Yes Yes
Safety Alerts Yes Yes Yes - -
UL Listed
Yes Yes Yes Yes Yes
Dimensions L x W x H (in.)
48 x 25 x 29 48 x 25 x 29 48 x 25 x 29 62.2 x 29 x 33.5 77 x 33.5 x 45