system invented and by who? Anyone who did not watch Modern Marvels know the answer?
The Romans around the first century. They had flue pipes running beneath their stone floors from one side of the building to the opposite, making the entire floor a heat exchanger.
Jim King
I think that it was Ork, the Neanderthal, who built his fire inside the cave under a hole in his ceiling. At least, that’s what he told us but you know how these guys used to brag.
Bingo JK, i never knew that before last night, the Romans were ahead of the times on many technologies.