Compact and simple equipment.
Very easy physical installation, in many cases, self-installable.
Communications via WiFi, without the need for wiring.
Hot water tank and electric heater
This is a 16A plug with power consumption measurement and a cut-off relay. It is inserted into the socket of the appliance in question. To manage the heater, a Smart IR can also be used to know the room temperature (one Smart IR can serve data to multiple radiators).
It is a universal infrared (IR) emitter. Installed on a table in direct view of the air-conditioning unit, it sends commands just as your remote control would. It is not suitable for controlling equipment without a remote control. Also measures ambient temperature and humidity. Powered by USB.