Seven years ago we installed a LMF 100,000 Btu Biomass furnace.
Well, it is still running — especially last night and today. The temp recorded on the solar thermal collector last night was 14.8 degrees here just outside Salisbury, NC. There is no replacement for solid fuel combustion — talk about HEAT.
It is currently running on soft-wood pellets. I took this photo today of the flame — the blue diamonds remind me of SR-71 exhaust..

Biomass Furnace Combustion
Our house is so well-insulated and air tight that the big biomass furnace just idles most of the time. Over the last seven years we have saved an average of $2,500 per winter on heat, moving from propane to biomass (aflatoxin corn, barley, rye and wood pellets).
Here is a link to my post from 2007 when the furnace was installed: http://www.kenclifton.com/wordpress/2007/02/biomass-home-heating/