Heliodyne model GOBI 408 solar colector panel for domestic hot water applications featuring aluminum absorber with blue sputter absorber coating on surface. Factory unions installed for easy installation. Fluid passageways and header are all copper. Size is 4' x 10', 38.3 sq ft absorber area. Black anodized extruded aluminum frame withlow iron tempered glass. 10 year warranty. This item is especially suitable for areas with severe winter weather climate or for use in space or radiant heating.