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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]This is possible, the technology is called "radiant floor heat."  Most commonly it's done with tubing that connects to radiator heat, but it can be done with electric mats that go under pretty much any kind of flooring.

People don't usually do the electric version over large areas because it costs a lot to operate, typically about three times as much as other kinds of heating.

[b]In a basement, if the floor wasn't insulated below when it was installed you'll be sending a lot of heat into the ground[/b], which is even less efficient. [/quote]

No. Heat rises, which is why radiant floor heating works in the first place. OP wouldn't be losing heat below if it's not insulated, though colder outside air may be seeping in. But also take into account that the ground temp underneath a basement floor would be warmer than surface air temps in winter. [/quote]

Well that's confidently wrong.

Heat moves in all directions. [quote]Modern building codes require basement floors to be insulated, and extra insulation if the floor is heated. [/quote][/quote]

I know building codes typically require ground insulation, but please show me where the building codes require additional nsulation for electric heated floors?[/quote]

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