ELECTRICAL HOT WATER HEATER

摘要

PURPOSE:To provide an electrical hot water heater capable of preventing excessive boiling of hot water within a heating pipe even in the case that an amount of hot water within a hot water storing tank is increased and a convection flow power of the hot water is reduced. CONSTITUTION:An electrical hot water heater comprises a hot water storing tank 1 for storing boiled hot water; a heating pipe 10 having a temperature flow rate control valve opened when the boiled hot water shows a predetermined temperature at an upper flowing-out port 10A; a lower pipe 3 for connecting a lower part of the hot water storing tank 1 with a lower part of the heating pipe 10; and an upper pipe 2 for connecting the flowing-out port 10A of the heating pipe 10 with the upper part of the hot water tank 1. There are provided two electrical heaters arranged within the heating pipe 10 so as to boil up the hot water within the heating pipe; a temperature sensor 4 for sensing a hot water temperature at the upper part of the hot water storing tank 1; and a control means 2 for supplying electricity to the two electrical heaters when the hot water temperature detected by a temperature sensor 4 is lower than a set temperature, supplying an electrical power to one electrical heater when the hot water temperature detected by the temperature sensor 4 is higher than the set temperature and further concurrently setting the other electrical heater to be non-conductive state.