The invention discloses a novel
solar water heater. The novel
solar water heater comprises a cylindrical
water storage tank, a
solar heat collector, a water inlet and outlet
pipe and a supporting frame; the novel
solar water heater further comprises a protection roller
shutter, a rainwater sensor and an STM8S single-
chip microcomputer; the bottom of the
water storage tank is provided with protrusions connected with the
solar heat collector and air exhaust openings; the cross section of the supporting frame is of an acute triangle structure, and the supporting frame is composed of support front legs, support back legs and a pressing plate; the protection roller
shutter comprises a rolling shaft, a driving motor and a protection curtain; the STM8S single-
chip microcomputer is arranged outside the
water storage tank and is electrically connected with the driving motor, and the rainwater sensor is arranged above the pressing plate and is electrically connected with the STM8S single-
chip microcomputer; and when the rainwater sensor senses rainwater, the driving motor is stated by the STM8S single-chip microcomputer, the rolling shaft is driven by the driving motor to roll, and therefore the free end of the protection curtain downwards stretches along the
solar heat collector until a first
magnet and a second
magnet on the protection curtain are attached. The novel solar
water heater is simple in structure, reasonable in design and long in service life.