My parents bought through costco and their vendor installed a generac, not sure on the kv rating. The install price was outrageous, as much as the generator, but that was a full hands off operation. The installer poured a slab, tied into the panel and natural gas line, delivered and hooked up the generator and transfer switch, etc. Aside from a 12v starter battery going bad, it has been great though a little loud. They live in an area where edison started shutting off the power every time the wind blows and it blows a lot. My only concern with natural gas is a disaster situation like an earthquake where the natural gas is shut off due to leaks or "An abundance of safety". I figure gasoline will be available in that situation in some form.