They, or it is called Radiant floor heat. This requires a boiler amd specialized tubing to be run undernieth the floor boards. It's very nice, but can be costly even if you have a boiler.

Hollywood. Thank you for your reply. However, this is not what I saw. It was a flat pad. The only way I can describe it, is as a 6 foot by 6 foot 'heating' pad, just like the one you would use for your back. It was about 1/4 to 1/2" thick, and had and electrical connection. It provides radiant heat, but from an electrical source. It was presented as a new product, designed as an alternative for older houses without HVAC ducts in the room.

Hi Bigmouth: You can find what you're looking for at www.warmfloorcenter.com Tell Rod that Brian (tankless) Wood sent you, & said hi.
If you need tankless water heaters, please call me at 1 800 851 9891 or e-mail me at hotwater@structurex.net

You'll really love that heated floor.

Regards, Brian.