Maximilian Obwexer had a problem. 

He was heating his home in Austria with conventional heating oil, and it was expensive. A tinkerer by nature, and a former engineer having worked on hydropower plants, he was trying to find a better way to heat his home. 

After many rounds of experimentation and having delved down the Bitcoin (mining) rabbit hole, three years ago he founded a company devoted to the effort. His company, 21energy, makes well-balanced, sturdy, and incredibly beautiful (and incredibly quiet!) miners for home use. The early models of Ofen 1 boasted up to 10 TH/s, while the premium model could reach, at top speed and making plenty of noise, 40 TH/s. Having scaled up…

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