Prevents freezing of underfloor water tanks. Built-in thermostat switches on electric tank heater when temperature falls below +5 °C. For connection to 12 V. Consumption approx. 4 A. Stainless steel with brass nut and gasket, overheating proof. For installation in fresh or waste water tanks. If the water temperature drops below approx. 5 °C, the frost monitor starts to heat the water. When the water temperature reaches approx. 10 °C, the frost monitor stops the heating process. Technical data: Power consumption 30 W during heating, reverse polarity protection, built-in thermostat with dry and overheating protection. Bore diameter 26 mm, thread length 16 mm, connections: 2 flat plugs with + and -; length 200mm, diameter 18 mm. Weight 290 g. E1 certified.