SunEarth Inc. ThermoRay TRB-20 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 5", 20 square feet. Black anodized extruded aluminum frame with low iron tempered glass. 10 year warranty. This item is especially suitable for areas with severe winter climate or for use in space or radiant heating.