PURPOSE: To avoid sudden reduction of a temperature of hot water to be taken out at the time of drawing of the hot water, by providing a bottomed, hollow and cylindrical flow speed attenuator having side wall, which is formed by making wire netting into multiple structure, on the tip of a hot water supply pipe.
CONSTITUTION: A heating circuit is formed by diverging a water taking-in pipe 6 into pipes 6a and 6b from the lower part of a hot water tank 3 through a check valve 10 and providing circulating pumps 4a and 4b, heat source parts 5a and 5b, branch pipes 8a and 8b of a hot water supply pipe 8 and the hot water supply pipe 8 on each of the pipes 6a and 6b in this order respectively. A bottomed, hollow and cylindrical flow speed attenuator 12 having a large number of small spouting holes 13 on its side wall, which is made into multiple structure by wire nets 13a, 13b and 13c, and connected with the hot water supply pipe 8 is provided so as to send hot water of a high temperature in the hot water supply pipe 8 into the hot water tank downward vertically from the upper part and to spout the hot water horizontally to the hot water tank 3. As the water of low temperature at a building-up time of the heat source parts 5a and 5b in an initial stage of additional burning is dispersed and spouted into the hot water tank 3 at a speed close to static pressure by the flow speed attenuator 12, it is prevented from dispersing widely within the hot water tank 3 and sudden reduction of a temperature of hot water to be drawn can be reduced.
KANEKO HIDEKI
INDOU MASAHIRO
YOSHIDA TSUNEHIRO
MIZUTA GOROU
