Hi chuck172. There is no storage with my system w/air water exchanger and I burn through the summer for dhw so my wood consumption, in comparrison, would skew the usage of our systems, but I was wondering what kind of wood you are basically using and how much you are using. If you only use your boiler for the heart of the winter heating season or shoulder to shoulder and do you use your system to supply dhw? My home is one of the "older" ones where insulation was yet to be discovered even though some improvements have been made since the original construction. Anyway...I was curious about your wood consumption compared to mine as our homes are very close to the same size. Thanks for your time..