| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heater built-in a hot water heat exchanger capable of preventing an odor of an evaporated circulation liquid even if installed at an indoor side. <P>SOLUTION: An air vent hole 25 is installed at an upper side of a cistern tank 7, and an upper bead 23 and a lower bead 24 which have bead shapes are formed. An air vent guide 20 is installed so that the air vent hole 25 is located between the upper bead 23 and the lower bead 24. By this, at a normal time, the air vent guide 20 descends by its own weight, and a portion around the lower part of the upper bead part 23 is brought into contact with a portion around the upper part of the air vent hole 25 so as to close the air vent hole 25. When the air vent guide 20 is pushed up, a clearance between the air vent guide 20 and the air vent hole 25 is completely secured, and the evaporated circulation liquid and air in the cistern tank 7 can gradually be emitted from the clearance to the atmosphere. <P>COPYRIGHT: (C)2013,JPO&INPIT |
