Generac offers two series of liquid cooled generators. These generators are designed more typically for commercial use. The commercial line offers kW rating between 25 and 150. The QuietsSource series offers kW ratings between 22 and 48. This Generac series can be found in both residential and commercial applications. Assuming at this point you know what kW rating your home or business needs, this might not be the right place for you. If you need a generator between 6kW and 22kW, check the air cooled section. If you are unsure of what kW rating you need, definitely check out our Generator Sizing Tool.
The Commercial Series generators are pretty self-explanatory, that is to say they are just commercial grade generators. The units themselves are built to be able to handle commercial applications where there is more of a demand on the generator. Even with the commercial rating you can still use them for residential purposes if your power needs require it. Since you are dealing with a much larger unit meant for commercial settings it will produce more noise than your average home unit. That said it isnt unbearable in a home standby setting, we just highly recommend that you look into your local code and decibel regulations to make sure you can use this series.
The QuietSource Series is still considered a commercial line in Generac liquid cooled generators, but, has the added advantage of the 1800RPM. RPM, revolutions per minute, is how we measure the speed of the engine. Unlike the commercial series these models dont have to spin at 3600 RPM. Half the speed also means a reduction in noise as well as the required maintenance. If you are thinking about using a liquid cooled model and have noise requirements than this would be the better option. Some of these units are rated very similarly to the air cooled units in decibels, even though they are much larger in size, because of the slow speed engine.
Even with these slight differences there is one notable similarity in these models when comparing them to air cooled generators and that would be in the controller. The Commercial and QuietSource models both have different options that allow for a much more thorough set of diagnostics to be run as well as more options for control of the generator. For the average consumer this might not be important, but when it comes time to service the unit this will make things very easy for the technician. Lets be honest, when it comes down to it labor can be pretty expensive so why not help out the service technician. With the controller providing more diagnostic options and controls youll be able to save money while still giving your home the best emergency source of power available.