The 6iE Smart WiFi Thermostat is the worldâs first underfloor heating controller with a Smartphone touchscreen. It features advanced technology to maximise on the energy-efficiency of a Warmup system a helping to reduce your energy bills by up to £400. For use with both electric and water underfloor heating systems, the 6iE does not require programming and uses Warmup as latest technologies to ensure your home is always at the right temperature, at the right time, for you.