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Model # 6240
MSRP: $3,359.00
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About Generac.com

Who is Generac?

Since 1959, Generac Power Systems has been designing and manufacturing backup power generators for residential, commercial and industrial applications. They have grown to be the world's largest provider of residential standby generators. Generac generators has revolutionized the commercial market with the first cost effective product line meeting the needs of small and mid-sized businesses.


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Generac Guardian 14kW Standby Generator Pre Packaged with 100 Amp 14 Circuit ATS 6240

  • True Power Electrical Technology
  • Two Line LCD Multi-Lingual Digital Evolution Controller
  • Includes 100 Amp Pre-Wired 14 Circuit ATS
  • Electronic Governor
  • External Main Circuit Breaker, System Status & Maintenance Interval LED Indicators
  • Sound Attenuated Enclosure
  • Flexible Fuel Line Connector
  • Composite Mounting Pad
  • Natural Gas or LP Gas Operation
  • 5 Year Limited Warranty
  • UL 2200 Listed


Details and Specifications

The 6240 standby generator package from Generac includes a 100 amp Load Center with automatic transfer switch. The automatic system keeps your home supplied with up to 14,000 watts of power during outages―even if you are not home―to help keep your family and property safe by keeping important and essential circuits running. The package includes a 5-year, limited consumer warranty.

Fuel Choices

Generac's 6240 generator will produce up to 14kW of power on either LP gas or natural gas, and conversion between fuels is an easy step performed during installation. The units are factory set for natural gas. The rate of fuel consumption is directly related to the electrical demand placed on the generator and changes continuously. Hourly LP gas consumption at half load is about 1.9 gallons while natural gas consumption runs about 177 cubic feet.  Required fuel pressure to generator fuel inlet at all load ranges 3.5" - 7" water column for natural gas or 10" - 12" water column for LP gas.


Generac designed the 992cc overhead valve industrial engine specifically to meet the tough demands standby generators place on an engine. They incorporated a fully pressurized lubrication system, Spiny-Loc cylinder wall construction for extra rigidity, and plateau honed cylinder walls with plasma moly rings for a long life, reduced oil consumption, and an extended 2 year/200 hour maintenance interval―crucial for operation during extended outages. The engine has oil and temperature sensors that allow the engine to shut down if low oil levels or high temperatures would damage the unit.

Evolution Controls

At the heart of any standby generator is a control unit, and the 6240 uses Generac's state of the art Evolution Controller. It constantly monitors utility power and detects outages immediately. After a 10 second delay (dealer programmable from 2 to 1500 seconds) it starts the generator and signals the automatic transfer switch to supply emergency power from the generator. When power is restored, the house is put back on utility power and the engine runs for about one minute to cool down.

Other features include a programmable exercise cycle, programmable maintenance alerts, status display, smart battery charging and advanced fault reporting. The color coded membrane keypad with LCD display and brighter LED indicators make using and programming the controller easier than ever before.

During generator operation, the Evolution ensures utility-quality power by regulating generator voltage and keeping engine speed constant.

With the addition of the optional Mobile Link messaging system, you can receive alerts and status updates on your cellular phone via text messages. Mobile Link also has an online dashboard accessible through a website from tablets, laptops, and smart phones―from inside your home or anyplace that has internet service. View generator status, schedule maintenance, or program exercise periods.

Wireless monitor options allow you to view generator status from inside the comfort of your home. The basic model uses LEDs to indicate generator status, while the advanced model includes an LCD display to view status updates or program maintenance schedules and exercise cycles.

Automatic Transfer Switch

The 100 amp automatic transfer switch and load center has 14 breaker positions and is prewired for 12 circuits (240 volt circuits use two positions each). During normal operation, it supplies the load-center circuit breakers with utility power from the main breaker panel and switches automatically to backup generator power during an outage. The transfer switch includes two conduits and wiring; one for connection to the main panel and the other for connection to the generator.

Generator Unit

The power generating unit is a revolving field design with skewed stators for exceptional power quality with low electronic noise that is suitable for powering sensitive electronics. This efficient, brushless design allows better voltage control, even when under heavy loads or supplying high surge currents for starting large electric motors.

Appearance and Noise

The 6240 was designed to fit into residential neighborhoods with a low, 66db noise level and steel enclosure that measures 48 inches wide, 29 inches deep, and 25 inches high. The powder-coat paint keeps the unit looking good for years to come. The generator can sit on either a bed of gravel or concrete slab, depending on local ordinances and practices.

Warranty Information

Manufactures Limited Warranty: 5 Years

Product Specifications

Model Number 6240
Manufacturer Generac Power Systems
Made In USA Yes
Rated Watts 14kW
Rated Amps 58.3
Voltage 120/240V Single Phase
A/C Ton Rating 4 Tons
Enclosure Steel
UL Listed Yes
Decibel Rating 66 db(A)
Starting System Automatic
Low Oil Alert Yes
Mainline Breaker 60 Amps
Hour Meter Yes
Battery Requirement Group 26R, 12V, 525 CCA
Mounting Pad Composite Base Attached
Product Weight 435 lbs.
Dimensions (Inches) 48L x 25W x 29H
Engine Brand Generac OHVI V-Twin
Engine Size 992 cc
Engine RPM 3600
Cast Iron Sleeve Yes
Cooling System Air Cooled
Alternator Type Brushed
Frequency 60 Hz
Auto Voltage Regulation Yes
Fuel Type LP/NG
NG Power Capacity 14kW
LP Power Capacity 14kW
NG Consumption @ Full Load 279 cu.ft/hr
NG Consumption @ 1/2 Load 177 cu.ft/hr
LP Consumption @ Full Load 3.0 gal/hr
LP Consumption @ 1/2 Load 1.85 gal/hr
Transfer Switch
Transfer Switch Model RTG14EZA1
Transfer Switch Amps 100 Amps - Nema 1 Indoor Rated
Transfer Switch Circuits 14 Pre Wired Circuits
1-40 Amp 240V
1-20 Amp 240V
6-20 Amp 120V
4-15 Amp 120V
ATS Poles 2
Warranty Information
Consumer Warranty 5 Year Limited
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Product Reviews

  1. Glad I Found Norwall

    Posted by Eric Wurm on 26th Jun 2014

    I am a contractor in Michigan. I had an important customer ask me to install standby power. I purchased the unit through Norwall and received a great deal. My electrician subcontractor has installed many Generac units, so hookup was quick and easy.

  2. Great product, easy enough installation

    Posted by Michael at Lortonbuilders.com on 22nd May 2014

    Got what I expected, a well made unit, installed as it should have. I recommend a professional for any installation as dealing with Natural Gas and heavy wiring to your house can be dangerous but it's well worth every penny. Couple suggestions for Generac if your listening. Why does the top cover of the transfer panel contact the white/neutral wire when installed? Its easy enough to bend it out of the way but this could be fixed with a redesign. Secondly, please check your wiring in the transfer case as mine came with the small red and white wires reversed. Third - you could use a better method for attaching the ground wire to the transfer case. A screw down lug would be great. Fourth - How about making a little more room for another size battery? It would be nice to be able to use a red top or yellow top battery that lasts longer than regular batteries but there's no room and they don't make a 26R. Other than that very happy! Works perfect!

  3. Awesome Generator But Even Better Delivery and Service From Norwall Power Systems

    Posted by Ron on 28th Dec 2013

    This generator is easy to install. Norwall and all their sales people are there to assist you if you have any problems. They are courteous and knowledgeable. Their delivery was on time. I will use Generac and Norwall Power Systems again!!!!!

Shipping Terms

All generators include 24 hour delivery notification and residential delivery. Liftgate service is available on all air-cooled generators and some liquid cooled units – Please call for verification. Free Shipping is curbside service only. Curbside service means the freight company will deliver to your address and lower your generator to the ground. The freight company will not back down driveways, place a generator in a building or where it is being installed. You are responsible for arranging the movement and setting of the generator.

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