Heating device with hot water supply function

Abstract

A heating device with hot water supply function includes: a combustion means; a main heat exchanger; a circulation passage connecting the main heat exchanger to an heating apparatus; a circulation pump provided in the circulation passage; a bypass passage that branches off from the circulation passage and bypasses the room heating apparatus; a secondary heat exchanger provided in the bypass passage; a cold water supply passage for supplying cold water to the secondary heat exchanger; a hot water supply passage for supplying hot water heated by the secondary heat exchanger; a hot water supply bypass passage that connects the cold water supply passage to the hot water supply passage bypassing the secondary heat exchanger; a flow adjustment means for adjusting the flow rate in the hot water supply bypass passage and thereby controlling the temperature of hot water to be supplied; and an expanded passage portion of the hot water supply passage whose diameter is increased from an intermediate portion of the hot water supply passage to its downstream end.

1 . A heating device with hot water supply function, comprising:
 a combustion means;   a main heat exchanger;   a circulation passage connecting the main heat exchanger to a heating apparatus;   a circulation pump provided in the circulation passage;   a bypass passage that branches off from the circulation passage and bypasses the heating apparatus;   a secondary heat exchanger, provided in the bypass passage;   a cold water supply passage for supplying cold water to the secondary heat exchanger;   a hot water supply passage for supplying hot water to which heat has been supplied by the secondary heat exchanger;   a hot water supply bypass passage that connects the cold water supply passage to the hot water supply passage, bypassing the secondary heat exchanger;   a flow adjustment means for adjusting a flow rate in the hot water supply bypass passage and thereby controlling the temperature hot water to be supplied; and   an expanded passage portion of the hot water supply passage, whose diameter is expanded from an intermediate portion of the hot water supply passage to a downstream end of the hot water supply passage.   
     
     
         2 . The heating device with hot water supply function according to  claim 1 , wherein the hot water supply bypass passage is connected to the expanded passage portion. 
     
     
         3 . The heating device with hot water supply function according to  claim 1 , wherein a diameter of the hot water supply bypass passage is smaller than a diameter of the hot water supply passage on an upstream side than the intermediate portion thereof. 
     
     
         4 . The heating device with hot water supply function according to  claim 1 , wherein a temperature detection means is provided in the hot water supply passage on the upstream side than the intermediate portion thereof. 
     
     
         5 . The heating device with hot water supply function according to  claim 1 ; wherein a distribution means is provided in a branching portion where the bypass passage branches off from the circulation passage; and
 the distribution means is capable of adjusting its distribution ratio, so that it becomes possible to perform only room heating operation, or only hot water supply operation, or simultaneous room heating and hot water supply operation.