I called my county permits office today to inquire about any regulations in place on wood boilers. I figured I better check now while I'm still in the exploratory phase of this project. I learned that there are no restrictions on the sale or installation of Wood Boilers in Maryland; however, they are illegal to operate. :-S I then called the State Environmental Agency and spoke to the gentleman in charge of overseeing this regulation. He was very helpful, and informed me that I can install a unit if it meets certain state established guidelines for visible emissions and grain loadings (I don't know what the latter means). Anyway, he was aware of Tarm but hadn't heard of EKO but he seemed to think that any decent gasification unit would qualify but they would have to confirm this before I could operate the unit. He also told me that Greenwood boilers have already been approved. So it would seem that selecting a Greenwood boiler would give me a shortcut through the regulatory process. I called Greenwood to get some basic pricing information, they are a little more expensive then Tarm or EKO but have 1000 pounds or so of internal ceramic brick for thermal storage so they do not require water storage. I asked and was told that water storage could still be used but eliminating water storage from my system would save about $6000 according to the rough numbers I have for an 800 gallon tank and heat exchangers. I am just curious to know what opinion any Greenwood owners have of their systems. I know there are a about a million variables from one system to the next but I'm just trying to get a general idea of how these systems operate. If I went with a Tarm or EKO and water based storage I'm pretty sure it would work out pretty well but I'm a little skeptical about eliminating the water storage. Of course, I have no experience on which to base these assumptions so they are just leaps of intuition on my part. So, what are my expectations? 1) Once a day feeding - During the normal week, I would like my system to be capable of providing heat in the morning for a couple of hours while everyone gets up and ready for work and school. Then the house sits empty for several hours before anyone gets home so no more heat is required until late afternoon and then throughout the evening until bedtime. I really don't want to feed my boiler in the morning; I would prefer just one daily feeding when I get home from work. On the weekends, or other times when we are home and using more heat, I would not mind multiple loadings. It seems the water storage would work out pretty well for what I want. In the evenings, the boiler could heat the house and recharge the storage tank. Then in the morning, the storage tank would provide heat and hot water for showers and keep the house at a moderate temperature during the day until I get home from work to fire up the boiler again. 2) I would like to generate DHW throughout the entire year. Without the water storage it seems I'd have to run small loads in the Greenwood all the time. With water storage, I was hoping I could skip a few days between firing. Also, are the Greenwoods harder to get going from a cold start due to their thermal mass? How do they behave while in bypass, any smoke or other issues? Any special considerations for adding water storage to a Greenwood? Thanks again to all.