Update: Testing phase completed, min ceiling clearance 2" to plenum, min wall clearance adjacent to stove pipe 18" (passed the standard temps at 4" however the minimum per UL 391 is 18"), 24" clearance from front of unit where ash and fire door are located, and zero clearance to wall next to cold air return box. Of course standard clearances will be listed in the manual: 18" above furnace, 48" from the front, 18" from the flue, 18" from the rear , and 18" from both sides. These clearances are to combustible materials and are trumped by local codes that may be more stringent. Did not do max btu input but seems to be in the 230 to 250 range with around 88% efficiency, will do some more testing at the shop to get some better numbers
All tests have resulted in passing data, now we will perform the analysis portion and verify drawings, material and component selection per the standard.
UL listed units with the appropriate stickers and operations manual will be available within the next month or so as soon as we round up all the data and get approval of the manual and warning stickers.
Thanks for watching, will keep you posted on up coming UL testing of the 220 Boiler.