The Ensto Optiheat frost protection cables are suitable for frost protection in water supply and drain pipes, rainwater systems, roofs, stairs and small outdoor areas. Switching voltage 230V. Min. bending radius EFPO10 25 mm, EFPO20 25 mm, EFPORAMP 50 mm. EFPO10 output 10W/m on the pipe surface at +10 °C, 16W/m in water at 0 °C. EFPO20 output 20W/m on the pipe surface at +10 °C, 40 W/m in water at 0 °C. EFPORAMP output 50W/m at +10 °C, 110 W/m in concrete at +5 °C.