Abstract: A solar heating system is disclosed of the type used to heat hot water or like fluid for domestic or industrial use comprising a collector assembly including fluid storage facilities formed on the interior thereof and exterior portion surrounding the fluid storage facilities. A collector unit including a coil element wound continuously about the exterior portion and disposed to define part or all of the exposed surface of the exterior portion wherein this exterior portion further is arranged at an angular orientation between a base and head segment of the collector assembly. A transparent or light permeable casing surrounds the entire collector assembly wherein the entire collector assembly is connected in fluid communicating relation with a preheater assembly which includes a fan and is preferably mounted in an attic or other environment wherein the surrounding temperature is greater than ambient temperature.