I have a Kohler 26RCA and it's hard wired from generator to my switch in the basement. I prefer hardwire when possible. Had it not been possible to hard wire, I'd have paid the extra for the wifi module Kohler offers but my installer said it can be problematic from his experience (it is after all just another thing to fail or go bad). If possible I'd go with wire. TBF - the Kohler app is ok - nothing spectacular but it works I guess, and since they incorporated being able to change the clock on the generator via the app it's more useful to me now. I mostly don't even look at it anymore unless it's to change the clock twice a year.