Bitcoin mining space heaters. 30 terahash 700-800w 26j efficiency. All metal, no 3d printed components, hand made by me. $300-$400. Only Bitcoin accepted. 
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I made my own, but I don't enjoy doing it.🤔
Need 👀
Does this include storage so we don't have to connect anything else to run? Sounds great would love to try running one of these as a grease warmer in an cogeneration design I've been dreaming up 😂
Contact me on signal.