Electric Underfloor Heating mats provide floors with a warm surface and are more energy efficient than standard water boiler heating systems. A self levelling compound must be added first before tiling over electric underfloor heating mats. http://www.tilesporcelain.co.uk/news/guides-advice/how-to-tile-over-electric-underfloor-heating-mats/
Radiant heat beneath tiles makes them toasty underfoot. But you don't need to have it throughout your house; you can simply add an electric mat to boost a bath's existing heating system. It can take as long as 45 minutes to warm up, so put it on a programmable thermostat to chase away the chill by the time your alarm clock goes off.
Portable Electric Radiant Floor Heating: Like an electric blanket for your floor, RugHeat is the only portable heating system in the world approved for use under area rugs. RugHeat is an innovative heating system that turns area rugs into "invisible" space heaters and lets you stay warm and keep your sense of style.