Schlüter-DITRA-HEAT-E-R6 is a versatile all-in-one smart thermostat for full control of the electrical heating of floor and wall coverings with Schlüter-DITRA-HEAT-E. It can be used with or without WiFi and with or without voice control. It can be operated manually via the 2” (5.1 cm) touchscreen display, remotely using WiFi in conjunction with the Schlüter-HEAT-CONTROL app (for iOS and Android smartphones or tablets) or by voice control using an Amazon Alexa or Google Assistant smart home device. Whichever mode of operation is chosen the thermostat can be programmed to control the surface temperature of the floor or wall covering, or the air temperature of the room, on a time schedule. An additional sensor, which is installed but left unconnected, is included within the box.