Heat loss

The collector loop piping system between collectors and storage tank must be insulated to avoid energy losses. The thickness of insulation on pipes of up to 1 in. (22mm) (outside diameter) should be at least 0.8 in. (20 mm), pipes up to 1-1/2 in. (42mm) should have at least 1.18 in. (30 mm) insulation.* Mineral wool is a widely used insulation of solar system installations. Any pipes and insulation material that are exposed (to weather and animals) should be resistant to damage (e.g., UV degradation and removal by birds) as not to fail. Zinc coated steel, aluminum, or stainless steel are all common materials used for the pipe insulation covering.