America has been heating buildings with water for well over a century. Cast-iron radiators in brownstones and row houses. Steam and hot-water systems in schools, hospitals, and apartment buildings from Boston to Chicago. Radiant floors in mid-century homes, and in millions of houses built since. Hydronic heating is not a European import — it's a mature, proven part of the North American building stock. What has changed is what sits at the front of the loop. For most of that history, the heat source was a boiler burning gas, oil,...
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