SOLAR HEAT WATER HEATER

PURPOSE:To prevent the freeze of water in a hot water supply pipe without using electric power by a method wherein a heat pipe is provided along a hot water exit pipe inside or outside of the hot water exit pipe of a solar heat water hater, and hot water in a bath tub and hot water in the solar heat water heater is connected thermaly. CONSTITUTION:Hot water which is heated in a heat collecting part 1 is storaged in a solar heat water heater 2, and is supplied in the bathtub using a hot water exit pipe 3. The lower end 6 of the heat pipe 5 which is provided in the hot water supply pipe contacts to hot water 7 in a bathtub 4, and the upper end contacts to hot water 8 in the solar heat water heater. Even if outer air temperature may drops, it is warm in the bathtub there being hot water 7, so heat can be obtained from the lower end 6 of the heat pipe 5, and this heat warm whole the hot water exit pipe 3 by the work of the heat pipe 5 and the freezing can be prevented. Furthermore, electric power is not necessary because the heat of hot water 7 is left in the bathtub.