... flow rate, big temp. difference, 3.Best choice for heat pumpWork Condition:1)Refrigerant side (Between the tube and shell):R22,R134a,R404a, ... High quality steel ,thickness:4mm. Features:1)Thanks to the small flow rate, big temperature difference design,easy to get the high ... structure of the coil ensures sufficient heat exchange between the gas and water.Safety:1)Whole tube inside shell has no internal ...