| 摘要 |
<p>PURPOSE:To provide an electrical hot water heater capable of preventing an excessive boiling of hot water within a heating pipe occurring when an electrical energization is started. 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 and flow rate control valve opened at a desired temperature of boiled hot water at an upper flowing-out port 10A, a lower pipe 3 for connecting the lower part of the hot water storing tank 1 with the lower part of a 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 storing tank 1. In addition, there are provided two electrical heaters arranged within the heating pipe 10 so as to boil up hot water in the heating pipe 10, and a control means 20 for supplying an electrical power to one electrical heater only for a period ranging from a starting of electrical energization to the desired time, making the other electrical heater non-conductive state and supplying electrical power to the two electrical heaters after a predetermined time.</p> |
