SunEarth Inc. ThermoRay Blue TRB-40-2 solar collector panel for domestic hot water applications featuring aluminum absorber with blue tec absorber coating on surface. Fluid passageways and header is all copper. Size is 4' X 10', 40 square feet. Black anodized extruded aluminum frame with low iron tempered glass. Updated design with split-pane glass configuration. 10 year warranty. This item is especially suitable for areas with severe winter climate or for use in space or radiant heating.