I recently bought a new never used Tarm Solo Plus 60 (60KW, 198,000 BTU) wood boiler. My next objective is to build a DIY pressurized storage system with propane tanks. I found a couple of used 1000 gallon propane tanks (for $750 each) that appear to be in very good shape. Attached are pictures of one of the tanks. I plan to heat a couple of internal insulated partitions (around 2500 sq feet) within a 50'x100'x16' eaves steel building used as my retirement workshop. I have a used propane boiler that can be used as a secondary unit. The preferred temperature would be around 50 deg F in the shop. I live in Northern Michigan and the winter temps are extreme. Assuming I have room for two tanks and could either stand the tanks upright vertical or perhaps horizontal, I have a couple of questions. 1. I've been reading and researching wood boilers for the last couple of weeks and one take away is that more storage is better than less. Would 2000 gallons of storage be considered "too much" for this boiler and application? Would I be better of with just one 1000 gal tank or perhaps two 500 gal tanks? 2. What's your opinion of the tank shown in the picture? Does it look suitable for heat storage? Note that the tanks are already plumbed with pipes on both ends of the tank. 3. I don't know what heat emitters I would use yet. In-floor piping is probably not doable unless it was possible to do pex in gypcrete on top of the existing 5" cement floor. I would imagine this to be very expensive though. Note: If I can't stand the two tanks vertical, I could weld together a heavy duty platform and have the tanks stacked over each other in a horizontal position.