domoteck manufactures WarmTouch, an electric blanket (rools of many length) that can be laid down to fit any area you want to heat. This blanket is Ultra-Thin (1/8" thick), it does not elevate the floor, and by being so close to the surface it heats-up the tile in 30 minutes. It is installed by the tile setter, in the same thin-set cement he uses to lay down the tiles, and at the same time.
If you cover an area 10' x 15' by staying 1' away from the walls, this installation of 150 sq. ft. would draw 2,250 watts (150 x 15 watt/ sq. ft.).
If you turn it on for 6.5 hours per afternoon-evening it would draw 2.25 kilowatt continously for the first 30 minutes to bring the temperature up to the level called for on the thermostat. Then it would cycle between ON and OFF, and draw electricity for a 1/3rd of the time (2 hours to cover 6 hours of warm floors). In total this consumption is 5.625 kilowatthour (2.5 hours x 2.25 kilowatt) which will probably cost you 45 cents, based on 8 cents per KWH.
You can fax a floorplan to domoteck at (630) 736 8089, or call (800) 875 5285, or visit our web site www.domoteck.com for further information.