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(Please note:  Any mention of brand names is for informational purposes only, and is not intended as an endorsement of a particular product.)

The Town of Hunter, NY, ( is host to both an indoor pellet stove and outdoor hydronic biomass furnace.  These units are being used to heat the town office building and the highway garage. 

Outdoor Unit:  The Town of Hunter highway garage is being heated with a Woodmaster AFS 1100 outdoor hydronic biomass furnace ( supplemental to an oil fired boiler.  The town highway garage is a large Quonset type building that is insulated on the inside of the steel with spray-on insulation.  The oil fired boiler is connected to a series of forced hot air convectors located part way up the ceiling (see photo).  The outdoor pellet furnace is plumbed into the oil fired boiler via a brass multi-plate heat exchanger.

The AFS 1100 at this site is attached to a 1.5 ton polybin ( via auger.  This bin is sold with the Woodmaster furnace as a unit.  Larger polybins are available if desired, but we chose a 1.5 ton bin because at present we are filling the bin with a 1000 lb bulk bag of grass pellets using a payloader, and there is a limit to the reach of the loader.  The assembly and installation/set up of the auxiliary bulk bin was a complicated task.  Eventually we will be demonstrating bulk delivery with a feed truck.  The AFS 1100 has a twin auger burn chamber feed system and an automatic (auger) ash removal system.  It has manual ignition and requires manual heat exchanger cleaning.

This system has been in operation since mid January and has been working well.  They have been burning about one-half ton of grass pellets per week.  It is too early in the project to know what the fuel oil usage has been since the pellet furnace has been in operation, but we will be measuring this. 

Indoor Unit:  The indoor unit at the Town of Hunter is a Harman P68 biomass pellet stove ( rated up to 68,000 BTU.  It has automatic ignition as well as room temperature or stove temperature operating modes.  It has a bottom feed pellet delivery system designed to work with a range of biomass qualities.  So far, this stove has worked very well at Hunter.  The large ash container is a plus with the higher ash content grass pellets.  We have experienced no clinkering (melting) of the grass pellet ash to date from the EnviroEnergy grass pellets we have burned.  The P68 stove is located in a main foyer area that opens directly to the outside in the town building.  The stove has been functioning on room temperature mode 24 hours per day.  They have been burning about 1 bag (40 lbs) of grass pellets per day.