Just finished my P61A install. The layout worked very well, and I got to use my existing 6" stove pipe (with 2 new sections also), so the cost was under $100.00 for piping/SS adapter etc. I will be burning GranuleLG's. I purchased 3 ton in August, and they are all stacked inside and ready to burn. Our home is super insulated (1900sq ft) two floors. We only burned 3 cord of wood last year as a primary heat source. We only used 100-125 gallons of propane from the end of October to May 20th for the dryer and H/W. I have a feeling this P61 is going to be perfect, and possibly never need to consume more than a bag a day. I collect tons of data, so it will be a fun experience! Still deciding whether I want to use the outside air intake or not...I will probably try it both ways throughout the winter and document changes/data during.