I am in the planning stages of converting my house to something other than oil. House is 2700sq ft in central mass, reasonably insulated, baseboard heat. I insulated my attic this past fall (~30" depth of fiberglass batts and blown fiberglass). I installed a MT Vernon AE pellet insert last February and I have been heating the house with it since. It has reduced my oil consumption by about 120-130 gallons/month. I am still using about 50 gallons/month of oil for DHW. If you work out the math, that is about $1200 to $1500/year for hot water, at today's rates. I investigate a propane tankless water heater. About $2000 to install. I need to get propane on the property, but I have to anyway for a new propane stove that I just installed in my renovated kitchen. Now, I am looking at Solar for DHW. Perhaps SunMaxx evacuated tubes. With that, I need a storage tank, and perhaps one that works with a wood gasification boiler. That brought me to storage tanks. I like the Haase Energy tanks because it includes 3 HX. I am trying to get a price on the 730 or 940 tanks. I could build one, but I want something that looks professionally done. I do all the projects around my house, including my kitchen, wood floors, etc, but I thought maybe looking at commercial for the tank, mainly because I only have so much time. My plan is to install in the following order, as funds allow: 1) storage tank with 3 hx 2) evacuated tubes solar panels 3) propane tankless water heater for backup 4) remove oil boiler and install gasification wood boiler 5) install a propane backup furnance, vented somehow I can see steps 1-3 adding to the value of the house. But step 4 is where I am having trouble. I can put up with adding wood to a furnace every day or every few days, but will the next owner? I have one flue for the existing boiler. I don't want to add another chimney stack. Which means swapping out the current boiler. Perhaps this is why people go with OWB. I was consider a dual fuel boiler, like the Tarm Excel but it's propane side is a compromise. The froling 3000 looks like my kind of boiler but it isn't dual fuel. I thought I could add a propane furnace later as a backup that was a direct vent. Perhaps put a tankless on each of my two zones as a backup. The problem is my furnace is on the front side of our house, which means the vents would be visible. I am trying to consider resale value and I don't think going with a gasification boiler alone makes sense. Do people consider resale value? Are there anyone with only gasification boilers? I suspect more in europe. Are any wood gasification boilers direct vent? Any comments welcomed.