PLEASE NOTE: If you require a Warmup 3iE thermostat with your Ambient heating kit please add the kit to your basket and select the NO STAT option,then proceed to the Warmup thermostat page to add the 3iE of your choice. The 3iE Programmable Thermostat from Warmup. An innovative touch screen thermostat with a full-colour screen. The first electric underfloor heating thermostat with Active Energy Management™ and an extremely easy-to-use user interface.