Spoke to a Empyre factory rep today and he mentioned Pro-Fab had a bunch of Greenwood GW-100 units available at deep discounts. Brand new units, no warranty. Did some digging and its pretty evident that over heating is a serious problem if the power goes out. Is it worth taking a $3500 risk? I'd probably run a heat exchanger and an open system design with this unit. Payback would be 1 or 2 years at this price.