The thermostat WRT21 is primarily intended for the control of infrared heating panels, but it can easily handle an electrical or gas boiler, or an air-conditioner. It can be controlled either manually, or by Wi-Fi control through user´s smartphone. The option to control the thermostat also by other household members is a matter of course. It is possible to choose among several very interesting settings, such as daily, weekly, holiday, setting of scene, group…. and many others. The thermostat also includes a well-arranged monitor and pushbuttons with micro-switches which guarantee a trouble-free operation and continuity in setting and control. It is possible to control the thermostat by voice assistants Amazon Alexa, Google Assistant, IFTTT and others.