... Pre insulated solar hose system ,fast installation ,no soldering,no leakage Thermal protection: The characteristic value of thermal conductivity ... at +40 °C, λ40°C = 0,039 W/mK, at ... 0 °C, λ0°C = 0,034 W/mK. Insulation thickness DN 16/ ... conductivity at +40 °C, λ40°C= 0,039 W/mK, at 0 °C, λ0°C = 0,034W ...