Strong: HBKD 24 watts / running meter or default : FK 17 watts / running meter Please select the desired length of the trace heating at the top right next to the product picture! (HBKD24 2 m to 30 m) the built-in cable thermostat automatically switches the heating on at less than 3 degrees Celsius and off again at around 8-9 degrees Celsius. · At temperatures below 3 degrees Celsius, the cable thermostat switches the heating cable on. Heating capacity 12 watts / m · if the ambient temperature drops, the heating output increases on Max. 24 watts / m in ice water.