Preheating device for hot-water storage type electric water heater and hot water type electric water heater with preheating device provided with the preheating device thereof

摘要

To provide a preheating device for a hot-water storage type electric water heater capable of realizing a sufficient amount of hot water even in a size which is difficult to secure a sufficient amount of hot water supply, and a hot water storage type electric water heater with a preheating device provided with the preheating device.SOLUTION: The preheating device P and the hot-water storage type electric water heater are provided, and the water heated in the heating portion H of the preheating device P and discharged from the discharge portion T is supplied to the hot water storage type electric water heater. The preheating device P includes a heating control part C in a main body part A having an introduction part N, a heating part H, and a discharge part T. The heating section H constitutes a water conduction path leading from the introduction section N to the discharge section T by providing the first heating stage H 1, the second heating stage H 2 and the third heating stage H 3 which are three heating stages in series. In the first heating stage H 1, the second heating stage H 2 and the third heating stage H 3, a U-shaped sheathed heater E for resistance heating by energization is provided in a vertically elongated guide water tank B from the top in a suspended state The volume of the preheating device P main body portion A is one tenth or less of that of the hot water storage type electric water heater.(FIG.