Just finished the install of a 1980 DF520 in my brother's house. Four zones of baseboard in the house, radiant heat in the basement floor. ~4000 sq. ft total, running buck size coal through a 60" auger pipe...no coupling. 7 gpm coil, "Fuel Smart" Hydrostat for the aquastat...adjusts the boiler temperature based on load. Seems to be working very well so far. Many thanks to Dave O'Neil and forum member Pacowy for the boiler.
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