This was real, not Fifties fantasy: a building heated by atomic energy.
Appropriately enough, the building, located in Harwell, England, was the center for that nation’s atomic research. Waste heat from the nicknamed “Bepo,” one of the atomic piles, was diverted to heat the 330,000 cubic foot/80 office building. The system cost $42,000, but it was estimated that it would save $7,500 per year in heating bills.
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Source: Popular Science February 1952