I recently purchased a Central Boiler E-Classic 3200. Max btus: 306k @ 8hrs: 262k @12hrs: 175k It will feed into 3 separate structures. I am running 1 1/4" thermopex about 2-3' underground and about 160 linear feet into the basement of a large, uninsulated, 1860's farm house. Wood siding. Did I fail to mention the original single pane windows? (approx 3,200sf ... it will be modernized eventually) I am running 1" thermopex about 2-3' underground and about 210 linear feet into a small caretakers house (approx 800sf), with some insulation and storm-windows. I am running 1" thermopex approximately 25' into a metal quonset hut / workshop which will have a central boiler 210k btu suspended space heater and will only be used occasionally. (approx 1600sf) At any rate, I need all the Btus I can get out of this puppy (northern nj, cold winters, near ski areas) Can anyone comment if this will even work as described? Efficiency? Do I need to provide more details? Boiler slab already poured, thermopex already laid, and foundations already sleeved. So I can't change much at this point. Also, I have a specific question about the big house ... The Central Boiler install diagram shows two heat exchangers, one for the hot water heater and one for my existing oil burner ... I picked up a 50plate heat exchanger from CB, but I can't find a water-to-water heat exchanger (sidearm) for the domestic hot water heater with 1 1/4" side ports ... the biggest I can find is 1 " ... Any thoughts? Alternate ways to install? Does it matter if I step down? From 1 1/4" to 1"? The installation diagram shows the hot water feed entering through the sidearm first, before eventually going through the 50 plate heat exchanger into the existing oil fired unit we have (and will keep) as backup. I think I bit off more than I can chew, trying to do most of this myself... no local plumbers have dealt with wood furnace installations before. Here is a diagram of the water-to-water exchanger: http://www.centralboiler.com/Tech/C100.pdf Here is a general diagram of the install for the house: http://www.centralboiler.com/Tech/C220.pdf This is on a 200 acre working family farm, appreciate any help.