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Originally Posted by SirMoby
Haven't they been using those in Europe for decades? At least heating floors using hot water.
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Actually there's been a system somewhat like that in use for quite a while. One of the earliest used hot air, but the same basic idea.
http://www.romans-in-britain.org.uk/...al_heating.htm
My guess is even back then, there were posts on the wall of the baths about how one hypocaust system or another was better.
