We have a Kohler PRO7.5E portable and had the house wired for it: external connector wired to breaker panel and transfer switch interlock. Cost for generator plus electrician was about $2,200. I do have to start it, plug into the house and activate the transfer switch. Generator is 7.5 KW starting and 6.5 KW operating.
All outlets are powered however can't run electric dryer or more than one electric stove burner. The rest is good to go; water pump, oil heat boiler with domestic hot water, heat pumps, all lights, etc.
Looked at a Kohler stationary, good product. We don't have propane; if installed fuel delivery trucks will not come up our driveway in the winter to refill after an extended outage.
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