I'm not a big fan of these "whole house" generators because they run on natural/LP gas, and require a lot of maintenance. In Texas, we've actually had the natural gas stop flowing during a big freeze. I'm a big fan of water-cooled low RPM diesel generators. As I said, I've been playing the "generator game" for decades. Here's what I finally ended up with, and couldn't be happier:
https://www.auroragenerators.com/product-page/agi13p
I get the reliability of diesel, but that 12KW system you pointed me to is twice the price of a 24KW NG/LP system, and until it gets to the point of the gas company turning off both gas and electric (sounds like tyranny and wartime), the NG system seems like an easier to manage system. Also dont need to store diesel fuel. I feel ok for now with having the NG and can always add an LP tank down the road. For having a power outage only a handful of times a year for between a few hours to a few days at a time, how much maintenance will that really involve? Cant imagine its more than vehicle maintenance.
How many gallons of diesel an hour, does that use?