HOT WATER SUPPLY DEVICE

PURPOSE:To prevent defective recycling of hot water by connecting a hot water supply pipe with a safety valve to the hot water supply inlet of an oil storage tank and providing an air-liquid separating section in a recycling circuit on the outlet side of a heating device and connecting it to the upstream side of the safety valve with an air vent tube. CONSTITUTION:A control device 33 drives a recycling pump 16 when the detected temperature by a detector 30 is lower than a set temperature of a temperature setting means 32, making a water pressure detector 18 turned ON. Then a fuel valve 27 is opened to ignite a burner 25, and the water from a recycling circuit 15 is instantaneously heated by a heater 19. With this heating the residual air in the recycling circuit 15 and the air dissolved in the water are separated, and the separated air is sent from an air-liquid separating tube 20 to a hot water supply tube 22 via an air vent tube 24. Then the air is discharged while a safety valve 23 is in operation or discharged with the supply hot water. On the other hand the hot water from which air has been removed returns to a hot water supply tank 10 through a piping 15a which runs vertically downwards. In this way defective recycling of hot water can be avoided.