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

Read Generac Guardian 6237 reviews before checking out.


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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
61 Reviews
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  • Features
  • Specs
  • 27
    Q&A 
  • 61
    Reviews
  • Articles
  • Shipping
  • Accessories
Grade
Airooled Standby Generators
Style
Watts
8 kW
Rated Watts
Voltage
120/240 Single-Phase
Fuel
Engine


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

Generac OHVI Air-Cooled Engine
Features plateau honed cylinder walls and plasma-moly rings
Full pressure lubrication system w/ 2 year oil change interval

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
Engine
Engine Brand
Generac OHVI
CC
410 CC
Consumer Engine Warranty
5 Years
Commercial Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Yes
Product Specs
Voltage
120/240 Single-Phase
Frequency
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 (Included)
Transfer Switch Amperage
50-Amps
Enclosure
Steel
Battery
Not Included (525 CCA)
Transfer Switch Style
Pre-Wired (10-Circuit)
ATS Service Disconnect
No
Cooling System
Air Cooled
UL Listed
Yes
Transfer Switch Circuits
15A 120V
3
20A 120V
3
20A 240V
1
30A 240V
1
Overview
Made in USA
Yes
Weight
350 Pounds
Product Length
48 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
5 Years
Commercial Warranty
5 Years
UPC
696471062373
Model
6237

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  27 Questions
Q: I have a 5th wheel trailer and wish to install an 8k gen. In the belly. Will probably use propane to power it. Can you put a home standby unit in an RV if it will fit ? .....the home units are so much cheaper ! Which brand you recommend for this, either home style or actual RV style ?
Thanks !

by Rich Stephens from Missouri on June 27, 2016

A: The standby generators must be permanently installed where there is utility power available due to the control wiring from the Automatic Transfer Switch and Generator. The only option would be an RV style unit.


by Mike, Product Expert
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 recommend a minimum of 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 Briggs & Stratton 8kW if you plan on having the unit closer to the house since it has a steel enclosure.

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
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
I'd Buy It Again (23)
Easy To Use (17)
Price (13)
Exceeded Expectations (10)
High Quality (10)
Cons
Bad Instructions (4)
Packaging (4)
Heavy (3)
None (2)
Too Loud (1)
92% of respondents would recommend this product to a friend
61 Reviews  Sort by 
 
Mike, the Generator Expert
Electric Generator Expert

Product Expert
Total Reviews
103 Reviews
Total Helpful Votes
8467 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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24731
Steve C.
Ardmore, OK
Purchased from Electric Generators Direct
Purchased 9/11/13
Total Helpful Votes
56 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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5622
Rae Lyn
Block Island, RI
Purchased from Electric Generators Direct
Purchased 11/29/15
REVIEWED
JAN.
23
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Nor' Easter
In the middle of a major snow storm. Its been blowing a solid 40 mph for hours, gusts to 60. On a small island out in the Atlantic. Generac has been running like a champ, best investment since my pellet stove .
Rae Recommends This Generac Guardian Product
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20
Joseph G.
Warwick, RI
Purchased from Electric Generators Direct
Purchased 10/31/15
REVIEWED
DEC.
31
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
Easy Installation
Install was incredibly easy and straight forward. My only complaint was that I would have like to be able to pick a transfere switch with more circuits as part of the packaged deal. Unfortunately I have not lost power yet to try it out although it runs all circuits I need plays more when I kill the master to test it.
Pros: I'd Buy It Again, Easy To Use, Price, Quiet
Joseph Recommends This Generac Guardian Product
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20
John
Purchased from Electric Generators Direct
Purchased 10/9/15
REVIEWED
NOV.
01
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
No Worries
I did the installation myself. It's a big job. Unless you are very comfortable in your breaker box, I would not recommend it. I did have a plumber run the 1" line off the natural gas meter to a stub at my generator location. One surprise was the 3/4" gas inlet at the generator considering the flexible rubber line is 1/2". The factory said they use the same plumbing inside the box as they do for the bigger gensets but the final 1/2" line is still appropriate for the... more
John Recommends This Generac Guardian Product
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43
John W.
Trenton, NJ
Purchased from Electric Generators Direct
Purchased 9/11/15
REVIEWED
OCT.
05
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generator Delivered
My new generator was delivered as promised with lift gate service and rolled into my garage at no extra charge. I am waiting for the electrical permits to begin my installation.
John Recommends This Generac Guardian Product
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21
Phil F.
Edgewood, NM
Purchased from Electric Generators Direct
Purchased 4/18/15
Total Reviews
3 Reviews
REVIEWED
SEP.
29
2015
4 out of 54 out of 54 out of 54 out of 54 out of 5
Exercising Your Generator
After reading the owners manual over and over I still cannot get to the edit screen on the generator display that would allow me to program exercise cycle's.

Very frustrating. I have to remember to manually start generator at least twice a month. I know the program is in there somewhere. It's just difficult to find.
Cons: Bad Instructions, Heavy
Phil Recommends This Generac Guardian Product
Mike, the Generator Expert
Product Expert
Phil,
Phil,
Sorry to hear about your issues. From the manual..."Upon first power up of the generator, the display interface will begin an installation wizard. The installation wizard will prompt the user to set the minimum settings to operate the generator. These settings are: Current Date/Time and Exercise Day/Time. The maintenance intervals will be initialized when the exercise time is entered.The exercise settings can be changed at any time via the “EDIT” menu.

I'd suggest contacting Generac directly @ 888-436-3722. They should be able to walk you through exactly how to set it up.
more
Manufacturer Response
Brand Rep
Phil,
We apologize for any frustration that you have experienced when attempting to set the exercise time for your personal unit. To set the exercise, we recommend going to the control board, and pressing ESC (escape). Then use the arrow keys till you see SUB MENUS flashing; hit ENTER on SUB MENUS. Once in SUB MENUS, use the arrow keys till you see EDIT flashing, hit ENTER on EDIT. Once in EDIT, you will use the arrow keys till you see EXERCISE TIME flashing, hit ENTER on EXERCISE TIME. Once in the EXERCISE TIME screen, it will go through select hour, select minute, and select day. Make sure you hit enter on each one. Once you do this, you can hit ESC all the way through, until you see HOURS OF PROTECTION. Also, please know that you should set the unit’s clock appropriately as well; if the unit’s clock is off, the unit will not exercise at your desired time. These directions are also listed under the “Setting the Exercise Timer” portion of the “Operation” section in your unit’s owner’s manual. To locate your unit’s documentation online, please use your product’s model or serial number via the following link: http://www.generac.com/service-support/product-support-lookup?cid=frm-100-ac . Should you require further assistance, please do not hesitate to contact us directly at 888-GENERAC (436-3722). We are available 24/7.
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10
Larry K.
Clio, MI
Purchased from Electric Generators Direct
Purchased 4/18/16
REVIEWED
MAY.
26
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Mostly Good
I didn't like that I had to go online to make the generator work in automatic. Back door method of forcing the registration.
The lever to switch from NG to LP works so hard I was afraid I was going to break it before I could get it switched. There is also no click or other feedback to let you know you have rotated it enough. It says 180 degrees but just when is that. I could be at 178 degrees, and if so is that ok?
There is no way to shorten the conduit wire between the switch and the... more
Larry Recommends This Generac Guardian Product
Mike, the Generator Expert
Product Expert
Larry,
The activation is required for warranty tracking. 180 degrees would be a 1/2 turn from the original position that the switch was set. For additional questions regarding your installation, Generac can be reached directly @ 888-436-3722
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00
Sam O.
Sevierville, TN
Purchased from Electric Generators Direct
Purchased 3/24/15
REVIEWED
MAY.
10
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Running Smooth Now
I had a little time delay getting replacement parts after first start up failed to turn off due to a failed component. Once that was replaced have had no issues, runs weekly test just fine.
Sam Recommends This Generac Guardian Product
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00
David L.
Franklin, CT
Purchased from Electric Generators Direct
Purchased 4/13/16
REVIEWED
MAY.
05
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Easiest Install!!!
I don't think Generac can make it any easier for us electricians than this package right here.
David Recommends This Generac Guardian Product
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00
Steve B.
Lake Tapps, WA
Purchased from Electric Generators Direct
Purchased 8/8/14
Total Reviews
2 Reviews
REVIEWED
APR.
19
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Best Buy Ever
We had used gas generators for years. We decided to install a natural gas standby generator in case I was not home. Best buy we've ever done. Works better than advertised.
Steve Recommends This Generac Guardian Product
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00
Thomas S.
York, PA
Purchased from Electric Generators Direct
Purchased 10/7/13
Total Reviews
5 Reviews
Total Helpful Votes
44 Helpful Votes
REVIEWED
APR.
05
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Saved More Than The Day!
When a winter storm hit late in 2014, high winds and icing conditions caused multiple power outages in our area, including one that lasted five days. Our Generac Guardian 8KW Standby System saved not only the day, but the better part of a week, a refrigerator and freezer full of perishables, five nights in a hotel and meals eaten out for the whole period. Ours was the only house with lights and occupants in the area throughout that whole week, and many neighbors stopped by to find out why. ... more
Thomas Recommends This Generac Guardian Product
Manufacturer Response
Brand Rep
Thomas,
It sounds like the unit is definitely serving its purpose! Thank you for providing us with your positive feedback; we are pleased to learn of your satisfaction with your 8kW automatic standby generator. At your earliest convenience, would you mind dropping sending us an email at ProductReviews@Generac.com? We would like to learn more about your ownership experience. Either way, we appreciate your business and thoughtful review!
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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
  • 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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