RE:RE:Hybrid Flu-AceYes: Very ''niche'. Being a boiler operator , I worked at one of these similar types,of facilities that would use a Flue-Ace hybrid .--- In my case, a very large greenhouse operation , with boilers in operation during the day , off line at night and weekend . Facility using hot water heating . --The Flue-Ace hybrid uses one unit to provide all the heating needs ,very efficient,eliminating various other pieces of equipment in older operations.