Me and my Dad built this about 25 years ago. The framing material, recycled from a tornado. 448sqf garage and 784sqf living space. Right now it's just a garage and storage. Was never finished out to live in. It has a 20 amp 110 v circuit running to it and no plumbing. Plan to use radiant water heat.
About the fifth built. Still have copper coiled around the riser. Added a drum on top filled with about 35 gallon of water. Kind of a batch heater.
pump hot water to these old tanks. using them as radiators. My cat likes the heated shed.
cobbed my smoker for mass and insulation. Much improvement. Takes less charcoal. More maintains more even higher temps.