Hot water supply device

Abstract

A hot water supply device ( 1 ) includes: a fin and tube type heat exchanger ( 17 ) for aplying heat to water with combustion gas; a temperature detection means ( 32 ) for detecting an exhaust temperature after heat exchange by the heat exchanger ( 17 ); and a determination means that determines that scale is deposited within the heat exchange tubing ( 27 ) of the heat exchanger ( 17 ) if the exhaust temperature detected by the temperature detection means ( 32 ) is higher than a set temperature.

1 . A hot water supply device, comprising:
 a heat exchanger for applying heat to water with combustion gas, including a plurality of fins, a heat exchange tubing, and a heat exchanger case;   a temperature detection means for detecting an exhaust temperature after heat exchange by the heat exchanger; and   a determination means that determines that scale is deposited inside the heat exchange tubing of the heat exchanger if the exhaust temperature detected by the temperature detection means is higher than a set temperature.   
     
     
         2 . A hot water supply device according to  claim 1 , wherein the temperature detection means is disposed in a neighborhood of the fins which are in contact with exhausted combustion gas that passes surroundings of a heat exchange tubing portion on a downstream side among the heat exchange tubing portions, in the heat exchange tubing constituting the heat exchanger, which are closest to a combustion portion where combustion always takes place during hot water supply operation. 
     
     
         3 . A hot water supply device according to  claim 1 , that is a latent heat recovery type hot water supply device, wherein the heat exchanger is a sensible heat exchanger for recovering sensible heat in the combustion gas, and further comprises a latent heat exchanger for recovering latent heat in the combustion gas at a downstream side of a combustion gas flow of the sensible heat exchanger. 
     
     
         4 . A hot water supply device according to  claim 1 , that is a latent heat recovery type hot water supply device, wherein the heat exchanger is a sensible heat exchanger for recovering sensible heat in the combustion gas, and further comprises a latent heat exchanger for recovering latent heat in the combustion gas at the downstream side of a combustion gas flow of the sensible heat exchanger; and wherein the temperature detection means is disposed in an exhaust passage between the sensible heat exchanger and the latent heat exchanger. 
     
     
         5 . A hot water supply device according to  claim 2 , that is a latent heat recovery type hot water supply device, wherein the heat exchanger is a sensible heat exchanger for recovering sensible heat in the combustion gas, and further comprises a latent heat exchanger for recovering latent heat in the combustion gas at a downstream side of a combustion gas flow of the sensible heat exchanger. 
     
     
         6 . A hot water supply device according to  claim 2 , that is a latent heat recovery type hot water supply device, wherein the heat exchanger is a sensible heat exchanger for recovering sensible heat in the combustion gas, and further comprises a latenheat exchanger for recovering latent heat in the combustion gas at the downstream side of a combustion gas flow of the sensible heat exchanger; and wherein the temperature detection means is disposed in an exhaust passage between the sensible heat exchanger and the latent heat exchanger.