... can reduce the heat loss by maximum . Environment FriendlyFor installing a solar thermal system , the economic benefit is obvious , but we ... ’s high flexibility and compatibility product features , plumbers will save a lot of time and energy on the installation . Long LastingAll ... +175°C5.The characteristic value of thermal conductivity at +40 °C, λ40°C = 0,037 W/mK, at 0 °C, λ0°C = 0,033 W ...