Hot water supply apparatus

Abstract

According to the hot water supply apparatus of the present invention, it becomes possible to effectively prevent the dew condensation on a bypass line. While exhaust gas after passage through a heat exchanger 2 is passing through an exhaust gas collection section 14 and then through an exhaust gas tube 15, combustion air in the inside of an inlet air tube 16 and a supply air collection section 17 is heated by heat exchange. A bypass line 19 which connects together a water supply line 3 and a hot water supply line 5 is disposed so as to pass through a clearance 20 defined between a supply air duct 18 which supplies heated combustion air to an air sending fan 6 and a burner casing 10 whereby the bypass line 19 is heated by the heat of combustion air in the inside of the supply air duct 18. Alternatively, the bypass line 19 may be disposed and placed so as to pass through the inside of the supply air duct 18.

1 . A hot water supply apparatus comprising:
 a heat exchanger which is heated by heat exchange with the heat of combustion from a combustion burner;   a water supply line for flow of water through said heat exchanger;   a hot water supply line through which hot water heated by passage through said heat exchanger is supplied;   a bypass line which connects together said water supply line and said hot water supply line so that said heat exchanger is bypassed;   an air sending fan which sends combustion air to said combustion burner; and   a supply air pathway section which supplies , to said air sending fan, combustion air heated by heat exchange with exhaust gas in the inside of an exhaust gas pathway section for discharge of exhaust gas from said combustion burner;   wherein at least a part of said bypass line is disposed and placed so as to pass through a position located close to a supply air duct which forms said supply air pathway section.   
     
     
         2 . The hot water supply apparatus as set forth in  claim 1  wherein:
 said bypass line is disposed and placed so as to pass through a clearance defined between said supply air duct and a casing of said combustion burner. 
 
     
     
         3 . The hot water supply apparatus as set forth in  claim 2  wherein:
 said bypass line is disposed and placed in a position lower than a flange which forms an upper end opening edge of said casing of said combustion burner. 
 
     
     
         4 . The hot water supply apparatus as set forth in  claim 2  wherein:
 a part of said exhaust gas pathway section and a part of said supply air pathway section are formed in the form of a double tube structure composed of an inner tube and an outer tube whereby said heat exchange with exhaust gas is performed. 
 
     
     
         5 . The hot water supply apparatus as set forth in  claim 3  wherein:
 a part of said exhaust gas pathway section and a part of said supply air pathway section are formed in the form of a double tube structure composed of an inner tube and an outer tube whereby said heat exchange with exhaust gas is performed. 
 
     
     
         6 . A hot water supply apparatus comprising:
 a heat exchanger which is heated by heat exchange with the heat of combustion from a combustion burner;   a water supply line for flow of water through said heat exchanger;   a hot water supply line through which hot water heated by passage through said heat exchanger is supplied;   a bypass line which connects together said water supply line and said hot water supply line so that said heat exchanger is bypassed;   an air sending fan which sends combustion air to said combustion burner; and   a supply air pathway section which supplies, to said air sending fan, combustion air heated by heat exchange with exhaust gas in the inside of an exhaust gas pathway section for discharge of exhaust gas from said combustion burner;   wherein at least a part of said bypass line is disposed and placed so as to pass through a wall of a supply air duct which forms said supply air pathway section and then through the inside of said supply air duct.   
     
     
         7 . The hot water supply apparatus as set forth in  claim 6  wherein:
 said bypass line is disposed and placed in a position lower than a flange which forms an upper end opening edge of said casing of said combustion burner. 
 
     
     
         8 . The hot water supply apparatus as set forth in  claim 6  wherein:
 a part of said exhaust gas pathway section and a part of said supply air pathway section are formed in the form of a double tube structure composed of an inner tube and an outer tube whereby said heat exchange with exhaust gas is performed. 
 
     
     
         9 . The hot water supply apparatus as set forth in  claim 7  wherein:
 a part of said exhaust gas pathway section and a part of said supply air pathway section are formed in the form of a double tube structure composed of an inner tube and an outer tube whereby said heat exchange with exhaust gas is performed.