Smee,
I think I know what you are looking for, which is are some realistic total installation cost numbers from various members on the group, so you can get a little better handle on the expected benefit/cost ratio of your various options. Or at least, that is what I went through all of last winter when I was planning my installation (and financing!) when I went ahead last summer with the purchase and install. Here is my setup, and what it cost me (roughly) when I got done.
First, here is the setup I put in. I have a large system, with two homes to heat, replacing 3 hot air oil furnaces. Our total oil consumption over the past several years was 1,700 - 2,000 gal/year. I needed an EKO60 to handle the load.
In round numbers, it cost:
EKO60 - $8K
500 gal storage with two HX coils - one for DHW, and extra for solar input - $1.2K (should have done 1,000 gal tank!)
underground PEX plus trench work $1K
8" stainless chimney, 24' $1.2K
Installation - $4K for materials, including 3 hot air HX
So, my total costs were right around $15K.
I did all my own installation work. If I had hired someone, it would have run around $3-4K more than the above materials. For comparison, I had gotten a package quote on an Econoburn last year, which was an even $20K for a full installation, including everything except the underground piping.
So for my fairly large, somewhat complex installation, I ended up at about $15K doing it myself, and it would have been $20K if I just wrote a check and let some else do all the work.
In comparison, an EClassic outdoor gassifier would be about $12K (I don't know their current prices exactly), and I would have saved the costs of storage and an indoor chimney, but would have spent more on underground piping, so when I ran the numbers, it came out fairly close in the total costs.
An outdoor conventional boiler (non gasifier) was a poor choice when I thought it through. The unit itself was cheaper, but all the other costs of underground piping, etc. were the same. I would be burning 30-40% more wood, and the lifetime of the units is not that great, due to their poor design. Plus the only viable location I had was directly upwind of the house, and I was about to suffocate my family, forget the environment.
I wasn't happy about spending so much on a new heating system, but especially last summer, there really was no other rational choice. If oil were at $4-5/gal as predicted, I would be spending over half as much in oil each year as I spent on the entire new system. Now, I can burn wood from our property, or buy additional as needed, and still pay the system off in a few years.
In the end, even though oil is cheap for now, there is no future in it. Maybe it will be $2/gal next year, or maybe it will be $6/gal. Whoever expected it to drop so much since the summer? - and what goes down, can also go up. It is a commodity that is demand, and I just don't want to be dependent up on it anymore - for both financial and environmental reasons. So then the choice is simply between which alternate energy system do you go with? I am planning on adding solar this coming summer, and will keep insulating and improving the heat efficiency of our homes. Over the years, I will keep building a system that can supply our energy needs, without fossil fuel. I can't wait for one of the kids to want to move back, so I can help them build a totally energy independent house using solar and biomass, along with a micro-hydroelectric and windmill. I have the site on the farm already picked out!
Finally, given the experience of some with some poorly performing gasifiers, I personally decided to go with a company with a history and a known track record, and with a local dealer who would support me. To me, that meant Econoburn, Tarm, Eko or Greenwood, although this is not a comprehensive list. The Garn was too large for me, and I suppose the WoodGun would another proven unit. The worst fear I had was to spend this much money, and wind up with a problem unit, where I was serving as a guinea pig for their R&D;. I have been extremely happy with the EKO, as have others with their other brands.
Good luck. It is a major investment of time and money, but it is worth it, and whatever the particular spreadsheets say about payback time, etc., there just is no future with oil that I can see. One side benefit of the EKO project, has been to get me educated in the alternate energy field. The first step is the hardest, but now, I am comfortable with the technology, and can't wait to keep learning and doing more!