Derelict Solar Thermal Storage Tank
This is, or rather was, the storage tank for the solar thermal hot water system. It's about 8 feet tall and 4 feet in diameter. It was used to feed pre-heated water into the hydronic baseboard heating system's boiler. A few years ago it rusted out, rendering the system defunct. Since the outbuilding that houses these systems was basically built over the tank, there's no way to get it out without removing the roof or bringing in a cutting torch. The replacement tank would have to be built in place or lowered in while the roof was off. Hopefully the replacement tank would also be somewhat better insulated.