I had a 36 Kw Generac Quiet Source single phase installed at our house in CO. In 13 years it has run less than 90 hours, most of it during the monthly test. One of my friends in VT has Generac, not sure which model or size, that ran almost 24/7 for nearly a month when they lost power after Hurricane Irene hit them back in 2011. Mine runs on natural gas, which is a lot less expensive than the propane that my friend in VT uses. It is important to have a good dealer to do the installation and maintenance. The dealer who we have in CO did a good job with the installation, but the annual maintenance has been irregular and if there was another dealer in the area I'd give them a try.
