FIELD : medicine.SUBSTANCE : device includes an electronic microwave unit on a magnetron, which is mounted on a frame with partitions, contains : a fan, a power transformer or an inverter power supply, a high-voltage capacitor, a diode rectifier bridge, a thermostat, a network noise filter, an electronic control unit with sensors of external temperature, humidity and icing and indicator LEDs connected to it. The electronic microwave unit has a protective casing. The device is made in the form of an autonomous electronic unit, which is installed on the side of the drain, at a height using simple technical means.EFFECT : improved operational reliability of drains.6 cl, 4 dwg