Split Pressurized solar water heater is fit for villa . The water tank is in the house,so it will not be cool so quickly. Split Pressurized solar water heater1.Heat pipe ... food grade stainless steel, With thickness 2.0mm, and high pressurized,when the capacity is larger,the inner is thicker to ... coil:diameter 12mm,thickness 1.0mm.single or double loaded. Split Pressurized solar water heater