Abstract: A continuous-flow fluid heater using solar energy is presented, where the solar heating is accomplished by means of a Fresnel lens focused on a conduit through which fluid is conveyed at a rate sufficient to heat the fluid to a desired temperature. The Fresnel lens is pointed at the sun and the sun is tracked by means of an off-the-shelf clock drive or step-motor system. The fluids that can be heated include water and cooking oil, and with modifications to the system, other liquids including liquid metals.