NOVELTY - The heater (15) has a copper pipe provided with thermal fins. A roof deck is secured to multiple trusses to form a pitched roof assembly. A roof covering i.e. shingles or metal, is installed to prevent precipitation from entering a structure. Angles of the trusses create a triangular void. An open slot allows hot gases to escape. A solar collector is formed in such a manner to form a serpentine pattern to reduce flow of water and expand the fluid cross-section for maximizing fluid's exposure to sun's rays.    USE - Roof vent and solar water heater for mounting on a ridge of a double-sloping roof.    ADVANTAGE - The heater is exceptionally efficient for directly heating potable water without necessity of the heat exchanger as the heater has unique design. The heater can be recycled and reinstalled or relocated, removed for repairs or easily modified to facilitate different applications, renovations or different configurations. The heater can be installed directly over an existing conventional roof ridge vent, thus eliminating the necessity of removing the existing roof vent and possibility of damage to the roof envelope and reducing labor intensity. The heater heats the water in the integrated tank/pipe/tubing to temperature closely to that of usable hot water and allows water entering and existing conventional water heating systems to be hot, thus reducing the need for fossil fuel consumption. The heater is convenient to operate, easy to install and inexpensive, and can supplant the primary water heating system for prolonged periods of time and raise the temperature of water entering the primary water heating system, thus reducing demand for fossil fuels and the amount of carbon dioxide released into atmosphere.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a roof vent and solar water heater.    Thermal transmission vents (3)    Hot gas exhaust vent/insect screen (4)    Precipitation baffle (5)    Reflective coating (9)    Roof vent and solar water heater (15)