Model # QT02515ANSX

Internet #203218339

Generac 25,000-Watt Liquid Cooled Standby Generator

Discontinued Generac

25,000-Watt Liquid Cooled Standby Generator

  • Automatic quiet-test runs at a lower RPM and uses less fuel
  • Delivers clean power with less than 5% harmonic distortion
  • True Power Technology delivers best-in class power quality

Frequently Bought Together

Product Overview

The experts in home standby generators present the Generac Guardian Series 25,000-Watt standby generator. Driven by the reliable, increased horsepower of a Generac 1.5L automotive-style, liquid-cooled engine, the 25,000-Watt Guardian Series can provide automatic whole-house protection for larger homes, or essential circuit protection for small and medium businesses such as convenience stores, restaurants, and offices. Choose from a variety of transfer switches to meet any need, including the Nexus Smart Switch. Engineered with Generac’s Digital Load Management (DLM) technology as standard equipment, the Nexus Smart Switch allows for more coverage with a smaller generator through smart load management. The Guardian Series is America’s #1 selling family of home standby generators. They run on your existing natural gas or LP fuel supply, and kick in automatically within 10 seconds of determining utility power failure. UL/CUL Listed. This item cannot be returned.

  • Patented, quiet test mode is a neighborhood-friendly self-test that runs quieter, uses less fuel, and emits fewer emissions than other brands, and you can schedule whenever you choose with user friendly digital controls
  • Generac nexus controller is the most comprehensive available, with a dual line, tri-lingual LCD display for easy monitoring and management of generator functions, including runtime and maintenance intervals
  • Sturdy galvanneal steel enclosure with rhino coat paint finish delivers superior weather protection
  • Engine runs on your home’s existing natural gas or LP fuel supply for continuous, worry-free operation, flexible fuel line included
  • Transfer switch and battery(group 26, 12-Volts and 525 CCA minimum) must be purchased separately
  • Click on the “More Info” tab to download the specifications pdf to view the refer a friend rebate for the $50 savings
  • Allow 30 days shipping
  • Crane required for delivery

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

How many electric devices will the 25k w run?

Asked by: Anonymous
Electrical demand cannot be measured in the number of devices. You will need to look at the data plates of each device to see the power demand and add it all up to determine if that is the generator to meet your needs.
Answered by: Earl
Date published: 2015-09-17

Does the 25kw generac come with a transfer switch

Asked by: Anonymous
No and in addition, you will need another electrical panel, for the circuits you plan to have the generator supply.
Answered by: Earl
Date published: 2015-09-20

what are the transfer switch specifications for the Generac 25KW generator QT02515ANSX

I have a Generac RTS Automatic transfer switch that I bought with a Generac 25KW generator in 2007 model 005325-1. Serial # 4679566. Guardian Quiet Source Can I use this switch with the QT02515ANSX model. If not what must I buy to be compatible with QT02515ANSX
Asked by: 2305
Generac’s 25kw automatic standby generator, model number QT02515ANSX, is a 120/240v, 1-phase generator. Considering this, we would recommend ensuring that the transfer switch that you utilize in conjunction with your generator matches those 120/240v, 1-phase ratings. Furthermore, while an RTS series automatic transfer switch may be applicable for use in your personal installation, we would recommend working with a local electrician, to ensure that you are utilizing the appropriate transfer switch for your home’s configuration. If you have any other product-related inquiries, please contact us directly at 888-GENERAC (436-3722).
Answered by: Generac
Date published: 2015-09-20

can you advise if this generator needs a California AQMD permit

what is the maximum size generator that does not require a permit?
Asked by: lpomatto
To inquire about which of our generators require a permit in your local area, we as the manufacturer would recommend contacting a local inspector, to ensure that you are acquiring the appropriate products and associated documentation in accordance with national and local code. If you have any other product-related inquiries, please do not hesitate to contact us directly at 888-GENERAC (436-3722).
Answered by: Generac
Date published: 2015-09-20
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Customer Reviews

25,000-Watt Liquid Cooled Standby Generator is rated 4.6 out of 5 by 9.
Rated 3 out of 5 by from Had problem with this unit. I purchased this unit new 3/1/11, and had to have the engine replaced at 21.9 hrs. after it blew two oil filters on 10/26/11. I had to go through a lenghty new oil pump replacement , relief spring replacement process before a new engine was ordered, delvered and finally it was installed 12/2/11. Generac started my warranty over, and the unit has self tested three times since this date. Working fine now. I bought an extended warranty also just in case.
Date published: 2011-12-27
Rated 5 out of 5 by from Now I don't worry when I leave town. We live eight miles north of the nearest town and the high winds cause trees to fall on the power lines often. Since we have a well, when there is no power we have no water. Last year we had our whole house generator installed and now have 'peace of mind'. The unit does the weekly self test, is quiet and never fails to kick in when the power goes out. I wish I would have been able to talk my wife into this many years ago.
Date published: 2011-11-22
Rated 5 out of 5 by from Product is self sufficient Product runs on a weekly test schedule that is unobtrusive and lists any problems it may have found with the unit. Recently we had a hurricane and it automatically turned on while the power was out for 5 days. We had evacuated, but readouts tell us that it ran steadily for about 3 1/2 days continuously and provided power that kept all our refrigerators up and running. We are very pleased with the item!
Date published: 2011-10-07
Rated 5 out of 5 by from invaluable! We have had our propane 25kw generac for 12 years now. Many storms, power outages and general electrical problems and our unit never gave us cause for concern. One of the best investments for our house we ever made. The unit is quiet compact and sturdy. Change the oil air filter oil filter plugs and you are good to go! Great job GENERAC! We are building a new home and it will be another GENERAC GENERATOR for us.frankiebabe
Date published: 2015-03-15
Rated 5 out of 5 by from Excellent product I have owned this 25kw generac generator since 3/30/2006. We have lost power many times since installation, mainly due to hurricaines. My generator has worked great. we do our entire house. Our only problem has been rusting of the exterior shell and I am now looking for an aluminum enclosure.
Date published: 2013-04-02
Rated 4 out of 5 by from HAD UNIT REPLACED My new engine from 12/2/11 failed,1.6 Chery Generac replaced entire unit with 1.5 Mistsu engine on 10/23/12. Hope it works as well as it sounds. Company stood behind warranty after two tries to fix.
Date published: 2012-11-20
Rated 5 out of 5 by from Our Generac gives us security and peace of mind in all kinds of wild weather. We've had our Generac for just about a year. It has served us well through a few small power failures, Hurricane Irene and the freak snowstorm on the East Coast on October 29, when our neighborhood was without power for eight long days. It tests itself once a week. It goes on automatically when the power fails and enables our family to live our normal lives--hot showers, hot meals, lights and television. I can even run the dishwasher and washing machine with no problem. I cannot recommend this product enough in these days of wild, extreme weather!
Date published: 2011-11-22
Rated 4 out of 5 by from can't truly rate this yet but i did I have a 36kw guardian series generac. we had a number of power outages here in southwest Oregon due to weather bringing down power lines to drunks hitting power poles. one time the power was out for 8 days and we were freezing our butts off since it was winter. when the power finally was restored the inhouse temp was 40 degrees f. so last year I decided to to get a generator to power the whole house since all we have here is electrical power. wouldn't you know it we haven't had a power outage in over a year. I do feel secure though in the knowledge I have a great alternative to keep us somfy when the power does go out which will be inevitable.
Date published: 2014-05-23
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