We have sub-bituminous coal, and are looking for the most efficient boiler. We have to heat about 6,000 square feet (three buildings). We're looking at the PerEKO KSR 75kW from http://www.kotly.com
, located in Poland, which is sitting at 83% efficiency. We would prefer a gasified system, but can't find one yet that meets our needs. We need to order ASAP, as winter is approaching. Any suggestions?