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The Generac Guardian™ 8kw standby generator system (50a 10-circuit automatic switch) is available for purchase today.

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Generac Guardian™ 8kW Standby Generator System (50A 10-Circuit Automatic Switch)

(Based on expert analysis, manufacturer ratings and customer reviews)

4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5
32 Reviews
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  • Features
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Grade
Air Cooled Standby Generators
Style
Watts
8 kW
Rated Watts
Voltage
120/240V
Single-Phase
Fuel
Engine
OHVI
Need Help? Call Our Generator Experts.


Fully Automatic Operation

Generac OHVI Air-Cooled Engine
Features plateau honed cylinder walls and plasma-moly rings
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)

Includes 10 Circuit Load Center Style Auto Transfer Switch (50A)
5' Pre-wired External Connection Box From Wall to Generator
30' Pre-Wired Indoor Conduit From Switch To External Box
2' Pre-Wired Indoor Conduit From Transfer Switch To Main Panel
12" flexible fuel line and manual included

Built-in Battery Charger (Battery Sold Separately)

5-Year Limited Warranty & 24/7/365 Customer Care


Model
  Model Number:6237
 UPC:696471062373
 Manufacturer:Generac Guardian
 Made in USA:Yes
Engine
 Brand:Generac OHVI
 HP/CC:410 cc
 Consumer Engine Warranty:5 Years
 Commercial Engine Warranty:5 Years
 Engine RPM:3600 RPM
 Low Oil Alert/Shutdown:Yes
Product Specs
 Voltage120/240 Single-Phase
 Frequency:60 Hertz
 Cooling SystemAir Cooled
 Fuel TypeLP/Natural Gas
 NG Power Capacity7,000 Watts
 LP Power Capacity8,000 Watts
 NG Consumption (50% Load)77 ft³/hr (BTU: 77,000 BTU/HR)
 NG Consumption (100% Load)121 ft³/hr (BTU: 121,000 BTU/HR)
 LP Consumption (50% Load).94 gallons/hr (BTU: 85,305 BTU/HR)
 LP Consumption (100% Load)1.42 gallons/hr (BTU: 128,865 BTU/HR)
 Rated Amps:33 Amps @ 240 Volts (Single Phase)
 Decibel Rating @ 7m:62 db(A)
 EnclosureSteel
 Mounting PadComposite (Included)
 Transfer Switch:Automatic (Included)
 Transfer Switch Amperage:50-Amps
 Transfer Switch StylePre-Wired (10-Circuit)
 ATS Service Disconnect:No
 Transfer Switch Circuits:3  - 15A/120V
3  - 20A/120V
1  - 20A/240V
1  - 30A/240V
 Battery:Not Included (525 CCA - Battery Group 26R)
Overview
 UL ListedYes
 Weight:350 Lbs. (158.76 kilograms)
 Dimensions:48"L x 25"W x 29"H
(121.92 x 63.50 x 73.66 cm)
 Consumer Warranty:5 Years
 Commercial Warranty:5 Years



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  26 Questions
Q: Are there recommended installation distances from other items? I have an AC unit near where I would like to place the generator. Also, would it be okay to be under a porch? There is about 5' from the ground to the bottom of the porch.
by Matt from Pennsylvania on June 18, 2014

A: The minimum distances can be found in the installation guide we have available on the site on the product page under the specs tab in the download document section.....

Installation Guide

The unit needs at least 3 feet clearance on the sides of the unit for proper air flow and 3 feet from the front for proper maintenance. Also, the unit requires a minimum of 5 feet clearance from the top of the unit. These units cannot be installed under a porch. These units also require a minimum of 5 feet from any window, door or ventilation opening.

We recommend you consult with your local inspector or AHJ (Authority Having Jurisdiction) for your local code requirements as they can sometimes supersede the manufacturers recommendations.

by Mike, Product Expert
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 the housing for Generac Home Standby Generators (Model 6437) fireproof?

by Robert C. Vose III from Massachusetts on April 26, 2014

A: The following information can be found in the installation manual and the installation guide we have available on the product page under the specs tab in the download document section.....

INSTALLATION GUIDE

The National Fire Protection Association has a standard for the installation and use of stationary combustion engines. That standard is NFPA 37, its requirements limit the spacing of an enclosed generator set from a structure or wall (Figure 1.10).

NFPA 37, Section 4.1.4, Engines Located Outdoors: Engines, and their weatherproof housings if provided, that are installed outdoors shall be located at least 5ft. (1.52m) from openings in walls and at least 5ft. (1.52m) from structures having combustible walls. A minimum separation shall not be required where either of the following conditions exist:

1. The adjacent wall of the structure has a fire resistance rating of at least 1 hour.
2. The weatherproof enclosure is constructed of noncombustible materials and it has been demonstrated that a fire within the enclosure will not ignite combustible materials outside the enclosure.
Annex A — Explanatory Material
A4.1.4 (2) Means of demonstrating compliance are by means of full scale fire test or by calculation procedures.

Because of the limited spaces that are frequently available for installation, it has become apparent that exception (2) would be beneficial for many residential and commercial installations. With that in mind, the manufacturer (Generac) contracted with an independent testing laboratory to run full scale fi retests to assure that the enclosure will not ignite combustible materials outside the enclosure.

NOTE: SOUTHWEST RESEARCH INSTITUE TESTING APPROVES 18IN. (457mm) INSTALLATION MINIMUM FROM STRUCTURE. SOUTHWEST RESEARCH IS A NATIONALLY RECOGNIZED THIRD PARTY TESTING AN LISTING AGENCY.

The criteria was to determine the worst case fire scenario within the generator and to determine the ignitability of items outside the engine enclosure at various distances. The enclosure is constructed of NON-COMBUSTIBLE materials, and the results and conclusions from the independent testing lab indicated that any fire within the generator enclosure would not pose any ignition risk to nearby combustibles or structures, with or without fire service personnel response.

SOUTHWEST RESEARCH INSTITUTE DECAL (LOCATED INSIDE THE GENERATOR, NEXT TO THE GENERATOR'S DATA DECAL)

SwRI Website Link

BASED ON THIS TESTING AND THE REQUIREMENTS OF NFPA 37, SEC 4.1.4., THE GUIDELINES FOR INSTALLATION OF THE GENERATORS LISTED ARE CHANGED TO 18IN. (457mm) FROM THE BACK SIDE OF THE GENERATOR TO A STATIONALY WALL OR BUILDING. For adequate maintenance and airflow clearance, the area above the generator should be at least 5FT (1.52m) with a minimum of 3ft. (.91m) at the front and ends of the enclosure. This would include trees, shrubs and vegetation shorter than 12in. (305mm) in height. Vegetation taller than 12in. (305mm) in height must have a clearance of 60in. (1524mm). Vegetation not in compliance with these clearance parameters could obstruct air flow. In addition, exhaust fumes from the generator could inhibit plant growth. See Figure 3.1 and the installation drawing within the owner’s manual for details.

Generator exhaust contains DEADLY carbon monoxide gas. This dangerous gas can cause unconsciousness or death. Do not place the unit near windows, doors, fresh air intakes (furnaces, etc.) or any openings in the building or structure, including windows and doors of an attached garage.

by Mike, Product Expert
Q: What are the 2 flexible conduit sizes coming off the transfer switch? Transfer switch that comes with the Model 6237
by Alan Butts Butts Electric Inc from Oregon on March 26, 2014

A: Here are the conduit sizes for generator model 6237....

30’- ¾” conduit
2’ – 1” conduit
5’ – ¾” conduit

by Mike, Product Expert
Q: Jim, this year has been colder then normal and my Generac doesn't want to turn over. Is there something I can do to prevent this in future years?
by Frank Newman from Minnesota on March 03, 2014

A: If you are running the unit off of a LP tank it could be the issue as LP tanks lose BTU output when the temperature drops and an 8kW model, at start-up, requires 128,865 BTU/HR. The minimum tank size for a zero degree area would be 250 gallons as it can output 169,200 BTU/HR.

The other option offered by Generac is their Cold Weather Kit which has a battery warming pad and an oil heater which requires the use of Synthetic 5W30 Oil.

Cold Weather Kit - Model 6212-0

by Mike, Product Expert
Q: Is it possible to upgrade the 50A 10 circuit ATS on Generac model 6237 to the 100A 14 circuit model RTG14EZA1 or are these shipped from the factory prepackaged?
by Thomas Williams from New York on February 18, 2014

A: All of the packaged models are prepackaged by the manufacturer and cannot be changed out. If you need the 14 circuit switch you would need to purchase the generator by itself and the switch separately. Here are the links for each individual item, just add them to the cart for final pricing....

Model 6245 - 8kW Generator Only

Model RTG14EZA1 - 14 Circuit ATS

by Mike, Product Expert
Q: Regarding the Generac 7kW fueled by Nat Gas . Spec states fuel consumption is 85 ft3/hr for 1/2 load. My question is what is this equivalent to in CCF?

by Ed from Pennsylvania on February 06, 2014

A: Natural Gas is usually measured by volume in the United States and is stated in cubic feet. A cubic foot of gas is the amount of gas needed to fill a volume of one cubic foot under set conditions of pressure and temperature.

To measure larger amounts of natural gas, "CCF" (centum cubic-feet) is used to denote 100 cubic feet, and "MCF" (mil cubic-feet) is used to denote 1,000 cubic feet.

With that said, due to the small amount of consumption you wouldn't convert the current ft3/hr to CCF.

However, if you are trying to calculate the cost in relation to therms listed by your natural gas company the conversion is 1000 ft3/hr equals 10 therms.

by Mike, Product Expert
Q: Hi Jim, I need to know if this will work for my house? Model 6237

I have 200 amp service but I really don't have to have one that big, so Im not looking to run everything. Just enough to get by until the power comes back on. What do you think?

I have an outside box but I think I can just run this to my inside box that is where everything I want power is located in case of a power outage. Will this one run my ac unit or not?

by Tim from Illinois on January 11, 2014

A: The Generac 8kW generator can adapt to any installation application as the generator will only power the circuits connected to the essential circuit transfer switch. This is as long as the generator has the output capacity to handle the circuits that are being connected. Something of this size will not handle starting amperage loads on central AC systems.

Please note that proper sizing of the generator is crucial to the success of any generator installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load.

A certified electrician needs to be consulted for proper sizing and installation of any generator.

When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting requirements in terms of amps and voltage which can be calculated to watts using Ohms Law (Amps x Volts = Watts).

When choosing the generator output select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 8 kilowatts, select a 10 kW generator).

A higher rated generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the future.

Note: Applications that are commercial, all-electric homes, have heat pump systems or geothermal systems require special installation procedures and a certified electrician must be contacted to evaluate and install these types of systems.

by Mike, Product Expert
Q: I have purchased the 6237 Generac from you and I have one question. The gas line running to the generator galvanized or black pipe which do you feel is better?
by Ed Smith from Pennsylvania on January 03, 2014

A: Per the manufacturer black pipe is recommended, however you must comply with NFPA 54 (Natural Gas) or NFPA 58 (Propane) for proper sizing and installation.

Here are the pipe sizing minimum requirements per Generac for model 6237....

Natural Gas Pipe Sizing

3/4 Inch - Max 55 Feet
1 Inch - Max 200 Feet

Liquid Propane Vapor Pipe Sizing

3/4 Inch - Max 165 Feet
1 Inch - Max 570 Feet

**Add 2.5 ft. per any bend, tee or angle in the pipe to overall distance.
**Pipe sizes are using a second stage regulator.

Gas pipe sizing is one of the most commonly made mistakes. A properly sized gas pipe is critical to the proper operation of the generator. The generator inlet size has no bearing on the proper gas pipe size.

by Mike, Product Expert
Q: Would winter time installations of automatic generators be good or bad?

by Ron Mills from Michigan on December 30, 2013

A: You can install a generator at any time. However, it would be based on if you are putting down a concrete base as it will not set in cold temperatures. If you are putting down crushed stone or pea gravel it should be no problem.

You can also go with a GenPad (Gen Manufacturer Specific) which is a preform concrete base, so no concrete curing time. These can be installed in any temperature.

Generac GenPads

by Mike, Product Expert
Q: I have a low pressure nat. gas line in my residence, what is the largest generator I will be able to run without doing major updates ?

by Chuck from Ohio on December 10, 2013

A: The Generac line of home standby systems can now operate on low pressure natural gas. Their low fuel pressure requirement is 3.5" to 5" of water column (1" of water column = 0.036 PSI).....0.123 PSI to 0.18 PSI. This would be for all sizes from 8kW up to 20kW.

Proper sizing of the generator is crucial to the success of any generator installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load.

A certified electrician needs to be consulted for proper sizing and installation of any generator.

When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting requirements in terms of amps and voltage which can be calculated to watts using Ohms Law (Amps x Volts = Watts).

When choosing the generator output select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 8 kilowatts, select a 10 kW generator).

A higher rated generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the future.

Note: Applications such as commercial, all-electric homes, heat pump systems or geothermal systems require special installation procedures and a certified electrician must be contacted to evaluate and install these types of systems.

by Mike, Product Expert
Q: If I'm not around when my home standby generator is running, what type of protections systems do the Generac units have?
by Josh from New Jersey on November 13, 2013

A: The generator may have to run for long periods of time with no operator present to
monitor the engine/generator conditions. Therefore, the generator is equipped with a number of systems to automatically shut down the unit to protect it against potentially damaging conditions. Some of these systems are as follows:

• Low Oil Pressure Sensor
• High Temperature Sensor
• Overcrank Sensor
• Overspeed Sensor
• RPM Sensor
• Under-frequency Sensor
• Undervoltage Sensor
• Overvoltage Sensor
• Internal Failure Sensor
• Low Battery Voltage Alarm

The control panel contains a display which alerts the operator when a fault condition occurs. The above list is not all inclusive. For more information about alarms and control panel operation, see Section 3 (Operation) in the owner's manual.

by Mike, Product Expert
Q: What type of oil should I use in my Generac home standby generator?
by Jim from Illinois on November 11, 2013

A: The maintenance section in the Generac's home standby owner's manual lists that the oil type is based on temperature ranges specific in your area.....

SAE-30 above 32º F (0º C)
10W-30 between 40º and -10º F (4º and -23º C)
Synthetic 5W-30 for all temperature ranges

All new models come with SAE-30 oil in them and have been test run at the factory for 25 hours and no break-in is required. The first oil change would be at 2 years or 200 hours, whichever comes first.

by Mike, Product Expert
Q: I'm not sure if this falls into the repair area but, I'm concerned about the sound this generator produces. Is there a way to lower that? Is there sound proofing approved for use for the interior walls of this type of home standby? My neighbors bedroom window will be 20ft from where I plan to install the generator. I would prefer doing something inside the generator as apposed to some type of fencing or other exsternal methods.

by Mark Hernandez from New Jersey on October 23, 2013

A: The manufacturers make every effort to reduce the sound of their generators as best they can keeping within NFPA and UL requirements. There are currently no options or parts available to install inside home standby systems to reduce their db(A) levels.

Your only option is location or sound barriers installed around the unit while keeping within NFPA and manufacturers distance requirements for proper fire protection, air intake and exhaust output.

We recommend consulting with your local inspector or AHJ (Authority Having Jurisdiction) as to the specific local code requirements.

by Mike, Product Expert
Q: Is the smart Switch the actual Automatic Transfer Switch? Or are they different? The specs says that there is an automatic transfer switch included. Also, I would like to know if a bottom pad for the generator included?

by Joseph Pylilo from New York on October 21, 2013

A: The "smart switch" is the automatic transfer switch. The ATS has an internal load manager that will load shed up to 2 AC units preventing the overload of the generator at start-up.

The generator does come with a composite pad already attached to the bottom of the unit (generator base) but a permanent base is required and can be either concrete, crushed stone or pea gravel with a minimum thickness of 3 - 4 inches.

We do offer the GenPad which comes in both 3 inch and 4 inch thickness...here is the link to review their info and pricing....

Generator Pads

by Mike, Product Expert
Q: I have a new 2013 Generac generator and I'm wondering what oil it came with? I would like to top it off properly after the installation.

by John from New Jersey on October 18, 2013

A: The Generac 2013 automatic standby generators are shipped with a SAE 30 non-synthetic oil. If you are located in an area that receives snow, it is recommended to perform an oil and filter change to switch to a synthetic 5W-30 oil to promote proper generator operation. The cold weather kit is also recommended.

The appropriate intervals for oil changes and other maintenance items will be located in the owner’s manual in the Maintenance Schedule.

Current production models do not require any break in, so if the Maintenance Schedule in the owner's manual indicates that oil changes only need to be done every 2 years or 200 hours, you could drain the existing oil and switch to synthetic 5W-30 right away.

by Mike, Product Expert
Q: Jim, I'm purchasing the Generac 6237 8KW, but I have no need for either a 20A/240V or 30A/240V breaker in the transfer switch emergency circuit panel, since my furnace, hot water heater, clothes dryer and range are NG. I and my electrician would like to swap out these two-pole 240V breakers for 15A/120V and 20A/120V single-pole breakers. What model, series and type number breakers should we buy so that we're prepared when the generator arrives? Thanks!
by Tom Steidel from Pennsylvania on October 13, 2013

A: Tom, Thank you for your inquiry....

With the Generac prewired switches Generac states you cannot alter the 240V circuits into 120V circuits as this will void the UL listing on the switch and the warranty on the generator for improper installation.

The way around this issues is to purchase the generator by itself and then get a larger switch that will accommodate the quantity of 120V circuits you need.

Your other options are to either purchase a larger generator that comes with the appropriate switch or purchase either the Briggs or Kohler units where this does not make a difference.

Briggs - Model 40445 - 8kW with 16 Circuit Switch

Kohler - Model 14RESAL - 14kW with 16 Circuit Switch

by Mike, Product Expert
Q: Jim, I am looking at the Generac 6241 and 6237. I do not want to install a full propane tank at home. Can the unit be easily hooked up to individual 5 gal. propane tanks?
As a backup, I am looking at the Generac 7500 Watt ($999) gasoline fueled unit...why cannot it not be shipped to CA? THX

by Alan from California on August 28, 2013

A: You cannot hook the home standby generators to 5 gallon propane tanks, you must install a minimum 100-150 gallon tank for them to operate properly.

Some generators cannot be shipped to CA because they do not meet the CA CARB compliance laws. The following link shows available models that can ship to CA.....

CARB Compliant Generators

by Mike, Product Expert
Q: What is the recommended time frame to change the break-in oil on my Generac 20kW generator?

by Karin Green from New Jersey on August 10, 2013

A: All of the new 2013 Generac Home Standby generators have been pre-run at the factory for 25 hours. So, no break-in period is required.

by Mike, Product Expert
Q: I'm interested in the Generac Guardian 8kW generator using natural gas. What size gas line does it require?
by Anthony Crego from New Jersey on August 07, 2013

A: Thank you for your inquiry.....

The fuel pipe size is determined by the distance from the fuel source with the generator being the first item after the meter.

The installation guide contains the following information.....

7-8kW Natural Gas Pipe Sizing

3/4 Inch - Max 55 Feet
1 Inch - Max 200 Feet

7-8kW Liquid Propane Vapor Pipe Sizing

3/4 Inch - Max 165 Feet
1 Inch - Max 570 Feet

**1/2 inch pipe is too small and cannot be used.
**Add 2.5ft. per any bend, tee or angle in the pipe to overall distance.
**Pipe sizes are using a second stage regulator.

Gas pipe sizing is one of the most commonly made mistakes. A properly sized gas pipe is critical to the proper operation of the generator. The generator inlet size has no bearing on the proper gas pipe size.

by Mike, Product Expert
Q: I'm looking at your 7kw Generac and the add says 7kw but the features info show 6kw? The Briggs specs say it can be placed as close as 18 to the house and I read from a customer the composite cover of the Generac has to be 5 feet away? Can you clarify for me?
by Nick Gianacoplos from Connecticut on July 23, 2013

A: The wattage output change is based on the fuel type you would be using. When using Natural Gas all generators have a wattage drop. The Generac CorePower unit outputs 7kW when operating on LP Gas and 6kW when operating on NG.

The Briggs model does offer 18 inches since it has a steel enclosure and the Generac CorePower has a composite enclosure so 5 feet is required as a minimum. We recommend upgrading to the Generac Guardian 8kW which offers the same 18 inches since the enclosure is steel.

Please keep in mind that local code can supersede the distance on any generator so you must check with your local inspector or AHJ (Authority Having Jurisdiction) for your local code requirements.

by Mike, Product Expert
Q: Transfer panel wires that come with the model 6237 generator are of what size
by Robert Selle from New Jersey on July 09, 2013

A: The indoor run from the switch to the wall where you go out to the generator is 30 feet and the run from the switch to your electrical panel is 2 feet. The generator also has an outdoor run of 5 feet connected to the back of the generator along with an outdoor connection box to connect the 30 foot length to where you penetrate the wall.

Per Generac you can add an additional maximum of 15 feet to any of the 3 lengths if needed.

The control wires are 14 gauge, the 2 hots and neutral are #6 and the ground is #8.

by Mike, Product Expert
Q: What if distance to generator is longer than 30' flex. Can I order from you the amount needed?
Is the transfer switch recessed or surface mount?

by Darin from Washington on July 04, 2013

A: The unit comes packaged only one way so upgrading the wiring harness is not an option prior to purchasing.

You can add a maximum length of 15 feet to the existing run as long as local code allows. If you need more then this length the entire run of wiring must be changed which means all of the wiring from switch to generator and switch to electrical panel.

by Mike, Product Expert
Q: What is the difference between the Generac model 5870 and their new model 6237 since they are the same size?
by Josh from Illinois on May 23, 2013

A: Generac went ahead and improved on the design, warranty and ease of installation after listening to consumer reviews and technicians.

They bumped up the warranty an additional 2 years to give it a solid 5 year overall which is one of the highest rated on the market.

They improved on the generator controller by upgrading to a new technology and moved from their very good Nexus design to the new and improved Evolution controller. This new controller has a back-lit interface with LED's that shows the generator status at a glance.

The new Evolution controller includes maintenance reminders and logs, battery condition (no guessing) and over a half-dozen additional alarms the Nexus controller did not have. This thing rocks!

They upgraded the engine to include a no choke carburetor which helps with all weather starting. They changed the fuel selector for natural gas and LP to an easy knob that is easy to access and change fuel type with ease (No tools required).

For the installers they made several changes to help with installation costs and time, minimize errors and accommodate current and future electric code interpretations by re-engineered some of the wiring connections.

With the changes to the carb and engine they were able to change the low fuel pressure rating for Natural Gas down from 5" of Water Column to 3.5" of Water Column. This will help tremendously with low fuel pressure areas in the country so the meters do not need to be changed as often.

With all of these upgrades they have performed I believe Generac's newest model is one of the best out there and comes highly recommended.

by Mike, Product Expert
Q: Hi Jim, How long will this unit run on a 100lb lp tank?
by Kevin Jackman from Rhode Island on May 17, 2013

A: Run time will be dependent on the load put on the generator. The unit has the following LP fuel usage.....

1/2 Load Output - 0.87 Gal/Hr
Full Load Output - 1.42 Gal/Hr

Generac Spec Sheet

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 6237 Reviews & Ratings
Write Review
Overall Rating
Features
5/5
Quality
5/5
Performance
5/5
Value
5/5
Overall
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5
Pros
Easy To Install (1)
I'd Buy It Again (20)
Easy To Use (13)
Price (10)
Exceeded Expectations (9)
Cons
Packaging (4)
Bad Instructions (3)
Heavy (2)
Expensive (1)
Too Loud (1)
94% of respondents would recommend this product to a friend
32 Reviews  Sort by 
 
Mike, the Generator Expert
Electric Generator Expert

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Total Reviews
102 Reviews
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4275 Helpful Votes
Electric Generators Direct Recommended

The Guardian 8 kW Emergency Power System is the smallest home standby generator offered by Generac Power Systems with their OHVI industrial engine.

It starts automatically -- just the like the bigger versions -- and protects mission critical appliances from power failure.

Here's the major difference. The 8 kilowatt version can restore power to 10 mission-critical circuits, including a sump pump, refrigerator, furnace fans, lights and more.

The 17 kW version can restore power to 16... more
Mike Recommends This Model
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18021
Steve C.
Ardmore, OK
Purchased from Electric Generators Direct
Purchased 9/11/13
Total Helpful Votes
37 Helpful Votes
Most Helpful Positive Review
REVIEWED
OCT.
02
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Satisfied Customer
Arrived on time without any damage. Everything was there. I had the pad already made and set the generator. Made all the electrical connections and then tested the unit. It started right up the first time.

I have it running on LP Gas.. Using it for backup power for a water well and storm cellar..
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Pros: I'd Buy It Again, Easy To Use, Reliable, High Quality
Steve Recommends This Generac Guardian Product
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3711
Roger S.
Houston, TX
Purchased from Electric Generators Direct
Purchased 6/18/14
Most Helpful Critical Review
REVIEWED
JUL.
30
2014
3 out of 53 out of 53 out of 53 out of 53 out of 5
I Only Wish...
This is for Generac, not for the folks that sold this one to my customer. I've been installing generators for a long time. I installed 2 Generac's for my family, they bought them, not me. When are you going to build a NEMA 3R transfer case and satisfy the need for us folks here in Texas were 98% of all homes have outside services. I recommend Kohler, not Generac do to that fact. On all the outside services, I have to purchase a NEMA 3R can, install the transfer switch in it and then... more
Pros: Easy To Use
Cons: Read My Comments Above
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51
Steve H.
St James City, FL
Purchased from Electric Generators Direct
Purchased 8/25/14
Total Reviews
3 Reviews
REVIEWED
OCT.
13
2014
4 out of 54 out of 54 out of 54 out of 54 out of 5
Mobil Link Problems
The mobile link worked as advertised the first 2 weeks, notifying me when the generator exercised. It hasn't notified me since although it's history shows it has exercised. I have tried to contact Generac several times to troubleshoot the problem but have yet to get a response.
Steve Recommends This Generac Guardian Product
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10
Tom B.
Angola, IN
Purchased from Electric Generators Direct
Purchased 8/21/14
REVIEWED
OCT.
14
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Service
I just purchased a 8 kw generator system from Electric Generator Direct, and the customer service was great. Received just what I ordered and shipped within a couple of days after I placed my order.

The price was very competitive with well informed sales reps. Thanks again.
Tom Recommends This Generac Guardian Product
Was this review helpful?
00
Bob
Plymouth, MA
Purchased from Electric Generators Direct
Purchased 8/31/13
Total Helpful Votes
20 Helpful Votes
REVIEWED
JAN.
04
2014
4 out of 54 out of 54 out of 54 out of 54 out of 5
Good Investment
I had a approved Generac dealer electrician install for $1800. He had to bore thru my foundation. The switch for choosing propane or natural gas arrived broken.He got it taken care of under warranty. A Generac factory rep did this work. We just got blasted with gale winds and 2 ft. of snow. But, didn't need the generator as so far electricity stayed on. Last Feb. we lost power for 5 days. It's comforting hearing it start up and run it's test every week. Good investment. Total cost w/ electric,... more
Pros: Easy To Use, Features, Easy To Store, Fast
Cons: Packaging
Bob Recommends This Generac Guardian Product
Bob Would Recommend Electric Generators Direct To A Friend
Web Site
5/5

Service
4/5

Shipping
5/5
"Service would have been 5 stars except for the delivery. Delivery was about a week and 1/2 from order placement. Web-site is good resource for reviews and videos of equipment and maintenance."
 more
Mike, the Generator Expert
Product Expert
Bob,
The average "estimated" delivery window for a large piece of equipment, in-stock, is 3 - 5 business days depending on weather and local circumstances. Order was placed over a holiday weekend (Labor Day) and unit shipped the next business day.
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206
Robert O.
Willoughby, OH
Purchased from Electric Generators Direct
Purchased 10/15/13
Total Helpful Votes
15 Helpful Votes
REVIEWED
NOV.
26
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generac
Pleasantly surprised at ease of installation process and how well built unit seems to be. Runs quiet and does everything instructions it will do. I've read many reviews and was skeptical but took a shot. So far, so good. Time will tell!!
Pros: I'd Buy It Again, Quiet, Features, Exceeded Expectations
Robert Recommends This Generac Guardian Product
Robert Would Recommend Electric Generators Direct To A Friend
Web Site
5/5

Service
5/5

Shipping
5/5
"Quick and easy everything. Thanks!"
 more
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153
William M.
Doylestown, PA
Purchased from Electric Generators Direct
Purchased 11/3/13
REVIEWED
JAN.
13
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Above Ground Electric
We have Lost power every year for the past 4 yrs. I work at a hospital so I can't call out when the weather is bad. This generator gives me the peace of mind that my kids are going to be warm and my beer is going to be cold during an outage. Not bad as far as hook up. Get professional unless your kind of handy and can read. Generator has a sleek look. It's also pretty cool when you shut the power off and this thing kicks on. Waiting for an outage.
Pros: I'd Buy It Again, Easy To Use, Reliable, High Quality
Cons: None
William Recommends This Generac Guardian Product
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80
Ralph F.
Carmel, NY
Purchased from Electric Generators Direct
Purchased 10/5/13
Total Helpful Votes
10 Helpful Votes
REVIEWED
NOV.
17
2013
4 out of 54 out of 54 out of 54 out of 54 out of 5
8kw
I needed to replace a 15 year old Generac generator in a hurry. the new one arrived quickly the way it was packaged was incredible.
Pros: Reliable, Features, Durable
Cons: Expensive, Noisy, Doesn't Come With Generator Pad, No External Gfi Outlet Like The Larger Kw Generators Come With
Ralph Recommends This Generac Guardian Product
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102
Carol K.
Edison, NJ
REVIEWED
JAN.
27
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
No More Blackouts
After going through 10 days with no electricity after hurricane Sandy, I was looking for a generator that would be easy to have. Being a widow, I am not able to handle a portable so I began looking for an affordable alternative. Went to the County Fair and met Corbin Electircal Services from Manalapan, NJ and they had on display the model I bought. Part of the reason I purchased it was because of the excellent reputation Corbin Electrical has and I knew they would not sell a product that... more
Pros: I'd Buy It Again, Features, Price, High Quality
Carol Recommends This Generac Guardian Product
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50
Edward S.
Schwenksville, PA
Purchased from Electric Generators Direct
Purchased 12/14/13
Total Reviews
2 Reviews
REVIEWED
JAN.
11
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
100% Happy
So far 100% happy with this purchase, I will give it a couple of months and give another review.
Pros: I'd Buy It Again
Edward Recommends This Generac Guardian Product
Edward Would Recommend Electric Generators Direct To A Friend
Web Site
5/5

Service
5/5

Shipping
5/5
"Easy online purchase, shipped on date promised, no damage, great!"
 more
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40
Linda F.
Brant Rock, MA
Purchased from Electric Generators Direct
Purchased 7/22/14
REVIEWED
SEP.
05
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generac Generator
I could not be happier knowing I will be so comfy, even in the dead of winter, I shall have power to heat our home and keep us warm..
Pros: I'd Buy It Again, High Quality, Exceeded Expectations
Linda Recommends This Generac Guardian Product
Was this review helpful?
20
Free Freight
  • Ships via Semi-Truck
  • Curb Side Delivery
  • 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
  • Guaranteed In-Stock
  • $50 Service Charge
Lift Gate Services
  • Safely Lowers Products Off the Truck
  • Requires Special Hydraulic Lift
  • Free Lift Gate
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Shop for the Generac Guardian™ 8kW Standby Generator System (50A 10-Circuit Automatic Switch) at Electric Generators Direct. Research Generac Guardian 696471062373 standby air-cooled generators online. Find Generac Guardian 6237 standby air-cooled generators & New Generac 8 kW 10 Circuit features and specifications. Get the best deal; compare Generac Guardian 6237 prices now. Buy the 6237 direct and save.