Model # 040503

Internet #204331273

Store SO SKU #1000975003

GE 20,000-Watt Air Cooled Home Generator System with Symphony II Whole House, 200-Amp Transfer Switch, Free Maintenance Kit

Discontinued GE

20,000-Watt Air Cooled Home Generator System with Symphony II Whole House, 200-Amp Transfer Switch, Free Maintenance Kit

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Product Overview

Our 20kW generator system by GE features our ground-breaking Symphony II power management system, advanced safeguarding features that meet rigorous industry fire protection standards, and a unique air-flow design that makes this our quietest air-cooled standby generator yet. It also features the longest, most comprehensive warranty in the industry. For a limited time, this generator even includes a free maintenance kit, making it an even smarter choice.

  • Patented symphony II power controls provide a managed power solution that gives you access to every powered item in your home, just not at the same time, by using power management modules, appliances are prioritized and turn on/off based on need and the electrical load placed on your home generator
  • Longest, most comprehensive limited generator warranty in the industry, no one else offers a 5-year limited parts and labor warranty, so you can be assured of our commitment to quality and to your pocketbook
  • Thoroughly tested against rigorous national fire protection agency standards, this is the only 20kw home standby generator with an all-steel enclosure and all-steel base, so it can withstand temperatures more than double that of aluminum and far beyond that of plastic
  • With an external, automatic gas shut-off valve, low pressure regulator and an internal thermal protection system, we've raised the bar on protecting the home and family during power loss
  • Proven to deliver non-stop reliability, our 20kW standby generator is powered by a premium-grade Vanguard engine that is developed for tough commercial applications
  • Includes a wireless monitor for inside your home, so you know your standby generator is working without having to go outside
  • Featuring unique air-flow technology, our 20 kW home standby generator is our quietest generator yet, and because it is 50% quieter than many portable generators, this is the best choice to keep your neighbors happy
  • Our enclosures are made from the same rust-resistant, durable galvanneal steel resulting in years of protection against chipping and abrasions
  • Our electronic governor provides stable, consistent power for sensitive electronics and today's most advanced appliances
  • Standby generator even comes with a free Briggs & Stratton maintenance kit for GE generator systems designed, manufactured and tested specifically for your generator’s needs
  • Want to learn about Standby GEnerators and find the right one for you? Click here for our GEnerator selector tool "
  • Click here for more information on Electronic Recycling Programs

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Name 10,000-Watt Automatic Air Cooled Standby Generator with 150 Amp Transfer Switch 20,000-Watt Air Cooled Home Generator System with Symphony II Whole House, 200-Amp Transfer Switch, Free Maintenance Kit 20,000-Watt Air Cooled Standby Generator with 200 Amp Service Entrance Rated Automatic Transfer Switch and Load Shedding 20,000-Watt Automatic Air Cooled Standby Generator with 400 Amp/Dual 200 Amp Transfer Switch
Brand Briggs & Stratton GE KOHLER Briggs & Stratton
Ratings (10) (58) (24) (19)
Commercial / Residential Commercial / Residential Residential Residential Commercial / Residential
Engine Make Briggs and Stratton OEM Branded Kohler Briggs and Stratton
Generator Features Automatic Voltage Regulation,Hour Meter,Low Oil Shutdown Hour Meter,Low Oil Shutdown,Overload Protection Hour Meter,Low Oil Shutdown,Overload Protection Automatic Voltage Regulation,Dual Fuel,Hour Meter,Low Oil Shutdown,Overload Protection
Continuous Wattage 10000 20000 20000 20000
View Product View Product View Product View Product



Product Depth (in.)
Product Height (in.)
Product Length (in.)
Product Width (in.)


CA (CARB) Compliant
Not CARB Compliant
Color Family
Commercial / Residential
Continuous Wattage
Engine Displacement (cc)
Engine Make
OEM Branded
Generator Features
Hour Meter,Low Oil Shutdown,Overload Protection
Operational volume (dB)
Product Weight (lb.)
Remote Monitoring
Response time (sec.)
UL Listing
1-UL Listed

Warranty / Certifications

Certifications and Listings
1-UL Listed,CSA Listed
Manufacturer Warranty
5-Year Limited Parts and Labor Warranty

More Products With These Features


Customer Questions & Answers

Does it run on gas, propane or diesel?

Asked by: Anonymous
gas, natural gas and LPG it comes with kits for all three
Answered by: JAC6836
Date published: 2016-11-27

Do you need a pad to put this on?

Asked by: John
Yes you do. One can make a concrete slab or they can be purchased. Also the generator should be bolted to the slab.
Answered by: John
Date published: 2016-11-27

Does the 50 amp control module need a dedicated neutral to supply 120 volts internally?

I cannot find, in the installation manual, where hot water tank installation is addressed. 220 volt power is typically supplied by 10-2 w/ground. The cable does not carry a neutral.
Asked by: Bob
Yes, it needs a grounded neutral.
Answered by: GeGenerators Support
Date published: 2016-04-01

I see one Symphony control module in the picture of this item. What is the model number of this included module?

Asked by: Dandridge
I can now answer my own question. My generator arrived with the 50A high voltage module (model number 71051). It can be used i.e. for an electric range/oven, aux/emergency electric heat coils on a heat pump, or electric water heater. I will have to order the dual low voltage module (model number 71053) to control the thermostat circuits of my split central air conditioner system.
Answered by: Dandridge
Date published: 2016-03-21
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Customer Reviews

20,000-Watt Air Cooled Home Generator System with Symphony II Whole House, 200-Amp Transfer Switch, Free Maintenance Kit is rated 4.6 out of 5 by 58.
Rated 5 out of 5 by from I'm happy with my GE 20kW generator After looking carefully at the Generac, GE, and Cummins generators, I settled on the GE 20kW model for my home. I live in a fairly large three level house in the mid-south; I have two air conditioners and a heat pump. I was initially concerned that I'd need to buy one of the bigger four cylinder generators, but after talking to a few folks, I decided the 20kW would meet my needs. I power the generator using natural gas, so the actual rating is 18kW. I had the entire job done by Paul K Young Electrical (501 AUTUMN CHASE CT, INMAN, SC 29349, (864) 331-9730). Paul did all the work, from helping me choose the right generator to testing it to make sure everything worked properly. During testing, we started up all three AC compressors, my hot tub (with all the blowers on high), and left everything in my house plugged in and running. When the A/C compressors kicked in, there was the briefest (less than a second) surge in generator engine load, then the engine continued to hum smoothly. With every load on, Paul measured generator output at 42 amps - leaving 33 amps to power more stuff before reaching the max output of 78 amps. I couldn't hear any audible evidence that the engine was loaded - it sounded the same carrying all the house loads as when it was idling. I had three load-shed switches installed, and they effectively sequenced the main loads. There's a remote indicator that confirms all systems are go that comes with the unit - nice to have, since I might not look at the generator itself often enough to notice a warning light there. The Generac system was a a little cheaper, but I was concerned about its load management capabilities (dimming lights, etc.). The Onan-Cummings generator was interesting; I particularly liked the reduced noise output, but didn't like it's load sequencing options as much as GE's. It would have cost about $1000 more, so the noise reduction didn't seem worth the cost. The GE sounds like a lawnmower; when the guys came through to cut my grass yesterday, the noise from their mowers was significantly louder than my running generator. All in all, I'm very satisfied with the product, and would strongly recommmend Paul Young as an installer.
Date published: 2012-09-14
Rated 5 out of 5 by from Everyone in a rural area should have one of these units. We live in a rural area of southwest Virginia where our power company is more retroactive than proactive. With this being said we’re in the dark a lot. After suffering through the June July duratio in sweltering heat I researched and ordered the GE unit from Home Depot. We had the unit installed and it wasn’t long before it was put to the test. The big test came on January 17th when got 10” of heavy wet snow. The generator self started at 6:00PM and ran constant until 10:15AM January 21st. We did nothing different than if we were running on utility power. Cooking, cleaning, hot showers, TV and any light we wanted. The generator never missed a beat. I was concerned about the rated fuel consumption of just under 4 gallon per hour at full load. This never came into play. We are using a 250 gallon propane tank which I kept a very close watch on. After running non stop for 88 +/- hours we had the tank refilled. To my surprise it only took 116 gallon to refill the tank. I have to smile when I hear the generator start at 8:30AM on Sunday morning to run the scheduled weekly test cycle. In rural southwestern Va. a generator is a necessity, the GE 20KW takes the worry out of power outages. I would recommend this unit to anyone.
Date published: 2013-01-24
Rated 4 out of 5 by from Remains to be seen This GE generator is a branded Briggs & Stratton unit with a better warranty. All customer support, technical support & warranty is done thru them, with GE providing none. That said, I have no problems with that. My issue is when purchasing from the Depot as they are not a listed service or warranty provider for this GE unit, it is up to you to find a dealer when required. Installation was pretty straight forward, with me hiring a licensed plumber and electrician as required. So far we haven't had an outage so it just sits there....waiting. How well it will work, I have no idea but I'm hopeful as it tests fine. It has a 5 year parts & labor warranty on the generator side, 2 year on the motor. That is longer than most. Again....I'm not sure who will handle this as all the Briggs & Stratton dealers are independent and let's face it, they handle there own installations first. This generator also has load shedding modules for extra cost which are optional & so far I have not had them installed. In short, I'm not sorry that I acted as the contractor, because I saved some $$, but next time I would hire someone from GE's list of authorized service dealer network to do a complete job.
Date published: 2013-01-07
Rated 5 out of 5 by from Very happy with my GE 20 KW Generator It is so nice when products actually do what they advertise they will. I have a 12 KW gasoline powered generator that has worked ok for the past four years. It powered my entire winter loads fine but not the AC loads in the summer. I started thinking about a whole house generator some months ago and settled on the GE and one other brand. I went with the GE because if it’s superior warranty and I could get it in a few weeks in lieu of a few months. The remainders of the comparison points were the same for both units. I also ordered some load sharing modules for my heavier loads like ACs and hot water heaters. I received the unit in just a few weeks. I had elected to pour a small concrete pad to put the generator on while waiting for it. We used the pipe as suggested to lift it and four men put it up on the pad. I had a plumbing firm run another line from my existing gas meter to the generator. The gas company also had to install a larger regulator to supply the extra load. I had an electrician install the transfer switch. The cost of the electrical and plumbing work/materials almost equaled the cost of the generator - so keep that in mind if you are considering one of these units. The plumber finished first. We set the regulator at the generator and then turned on all heat in the home and started the generator. With no load the gas pressure stayed exactly in the middle of what the GC installation manual specified. The generator runs very slightly rough when under no-load conditions but GE tech support said this was normal and would go away after a break-in period. My home is 3500 square feet and has eight tons of AC (three units). After the electrician completed his work we ran load tests. I have not installed any of the load shedding modules yet so I adjusted the loads manually. I had most loads in the home on except the ACs. I performed the startup procedure per the manual and the generator came up perfectly. I turned on one of the 3-ton ACs and the generator NEVER EVEN missed a lick. The gas pressure was also constant at 6" H2O. I was pulling about 40 amps and 27 amps on each phase respectively. I turned on the second 3-ton AC and it was barely noticeable to the generator. The generator runs very smoothly with even the slightest load on it. Now my current was in excess of 40 amps and 38 amps on each phase respectively. I let it run like this for an hour and it just purred along. The gas pressure still remained at 6" H2O. The voltage and frequency were exactly on. I have had the unit for about two months now and it has been on-line for over a month. It is located right outside my office in my home and is very quiet when it does its weekly test run - quieter than my riding lawnmower. I am going to install the load modules soon. I took many pictures and recorded gas pressure, frequency, voltage, and current through this whole process. I had only one occasion to call the tech support people and they were very nice and knowledgeable about the product. I highly recommend this product and I am happy that the Home Depot carried it.
Date published: 2013-02-10
Rated 5 out of 5 by from Generator with the biggest Bang for your Buck! After doing extensive research, and installing a Generac Gaurdian and having it fail when I needed it most, I was led to this wonderful machine by my authorized dealer. I had this 20kw GE whole house generator installed a few months before Hurricane Irene. Not only did it preform amazingly well, when Sandy came around it was like it had never even hit (having 4 families stay with us on the other hand.... ) :). I consider myself a generator aficionado, and trust me when I tell you that this machine is the way to go. I do, however, recommend that you have it installed by an authorized generator installation company, because it makes a big difference in warranty and service coverage.
Date published: 2013-01-22
Rated 4 out of 5 by from Not a Bad Generator. It really is your best bang for your buck. You can't beat the 5 year warranty. Everything in it is Briggs and stratton, with some "special touches" from GE. Within 6 months the voltage regulator on the board causing the starter to burn out. This was replaced very quickly within 24 hours which is great. You can't really judge a product based on that though. Other than that this beast powers the whole house, 2 furnaces, and 2 Acs with plenty of power left over. When it works its a solid 4 stars with the following annoyances: 1) We live downtown and during an outage would like to turn off the generator at night so not to waste fuel and disturb the neighbors. The only way to do this is to walk outside and hit the off button. It would be nice if there was a automatic cool down period after hitting the off button. It also would be nice if we could wire a on/off switch inside the house. Instead its attached on the board. 2) Since we will loose power for maybe 30 seconds in the middle of the night all the time, i keep the unit turned off unless we need it. If its not turned off we hear the thing fire up for 5 mins. at say 3am and its annoying. It would be nice to adjust the turn on delay and set it for maybe 15 min, if the unit senses no power. Or even better, if there was a way to wire a timer to the unit so the unit will not turn on between the hours of 11pm and 7am. 3) The exhaust points straight down and the hot gases absolutely kills the lawn. Surly there was an easy way to have the fumes shoot up so it also does not catch rain. Now as a home owner, i need to live with a large swath of dead grass or oddly place some sort of landscaping stone around the unit. 4) If we had a large yard with no neighbors it would be very quite. However, our bedroom is by the unit so we hear it turn on. They could make a slightly oversize housing, with extra insulation inside to make it more quite. I would gladly pay more for that. 5) I change the oil myself it in. It would be nice if the drain hose was longer. The way the unit sits on a pad, its hard to get the hose down into an oil pan with out using another say 8" of random material to get the oil down into the pan. I had it professionally installed so i would imagine the install was pretty run of the mill. These units can burn oil, so if you have a storm coming, you might want to check the oil level before the storm. Over all, you can't beat the warranty , in my eyes when you buy a piece of equipment like this, assuming all performance specs are the same, the warranty is where its at.
Date published: 2013-02-19
Rated 5 out of 5 by from Have this installed by a certified installer I have seen many reviews with people reporting some issues. I hired a pro that was factory certified and trained. It wasn't cheap, but I was enjoying life during Hurricane Sandy while my neighbors who hired "electricians" were annoyed that their generator wasn't working properly. My priority zones were great and I was protected from any issues with the smartest investment I made. As for the question about 5 ton air conditioner, my installer informed me that it is a known issue and my 5 ton AC worked fine on generator power. No issues whatsoever. Key is having the professionals installs this generator.
Date published: 2013-01-28
Rated 4 out of 5 by from Saved our bacon from Hurricane Sandy Felt like the smartest guy in the world when the generator kicked in early during the arrival of Sandy. Everything inside the house functioned exactly as if the power had not failed. I was a little disappointed that the engine consumed enough oil after 3 days of continuous low-load operation to shut down, but it was quickly solved with 2 extra quarts. I'll be sure to keep a few spare quarts on hand, but frankly I'm hoping she won't need them after less than 100 hours of operation next time. I had to install this quite close to my home due to zoning and building code; I wish the sound insulation were a little better. It's still a lot quieter than a gasoline-powered portable. All in all I'm very very satisfied and looking forward to beating whatever power failures mother nature will throw at us next.
Date published: 2012-11-05
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