I have been very happy with my Koker. The constant convection blower and no idle mode turned out to be my fault. I had wired the wall thermostat improperly since I felt I did not need to read the instructions that honeywell included with it. Once i read the instructions and corrected the wiring on the Tstat side, it has been running great. I only have 3 floor registers currently installed in my first floor, and am temporarily blocking the basement door open to allow a cold air return. Despite my less than adequate amount of registers, I have been keeping my thermostat set at 72, and the house will fluctuate between 70 and 72. the basement stays between 72 and 78 just by the radiant heat the koker and duct work give off. As far as fuel consumption, I have been averaging one 40 lb bag of coal per day, and a bag and a half on a couple of days when iyt went into the mid 20s at night and was windy and in the 30s during the day. I have settled on 6 3/4 turns out on the feed screw for now, I have tried as far in as 5, but the coal consumption went up to 2 bags a day and the home temp fluctuation only improved a half a degree. I have decided to leave the feed adjustment alone until I add 2 more registers on the first floor, as I feel this will take care of most of my fluctuation in temp. I have not hooked up the HW coil yet, and dont know if i will tie it in to the hot water tank. My koker spends 60% of its time idling, and during these times it does not seem to produce much heat from the coil. I will probably try to tie it in to a hot water radiator in my garage and whatever it does it does as far as heating things up out there.
My home is a an 8 year old colonial , in the woods with limited wind exposure. It has 6 inch exterior walls with r23 roll in insulation in them, and R38 blown in in the attic. Ceiling height is 8 ft with the exception of 16 ft in a 8x10 foyer. basement is 1400 sq ft with R19 rolled in insulation between all first floor joist. Just from stove radiant heat, basement stays 72 to 78. First floor is 1400 sq. ft. Semi open floor plan with one large room consisting of kitchen , dining room, and living room, and five medium to small rooms. With 3 registers in floor measuring 10x4, Temp stays between 70 and 72 with convection blower running twice an hour for five to ten minutes. Thermostat is located on first floor near basement door which is current cold air return, it is set on 72 F. Second floor is 1000 sq ft, has no registers yet but has stayed around 70 just from heat radiating through floors and walls. Coal consumption has been one to one and a half 40 lb bags on average. I am very Happy so far.