NYC spa heats pools with bitcoin mining, but experts question energy efficiency
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Bathhouse spa in NYC uses bitcoin mining to heat its pools, calling it "energy neutral"
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Journalist questions if it's actually more efficient than electric heaters
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Expert says nearly 100% of mining energy turns to heat, but heat pumps are 50% more efficient
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Heating pools with bitcoin mining less wasteful than dumping heat, but not most efficient
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Author visited Bathhouse once pre-bitcoin heating, hesitant to return now