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by ugl 1460 days ago
The infloor and in-wall heating systems are just recently being re-introduced! 2000+ years later. Even small buildings in the wilds of england are found with hypocaust tiles. I just saw a video introducing a brand-new underfloor heating system using hot air! The not leaking liquid was a big selling point.

Everything old is new again.

https://en.wikipedia.org/wiki/Hypocaust