Water heating apparatus and water heating system

Abstract

In an immediate hot water supply operation mode in which a circulation pump is activated while a hot water supply faucet is closed, a water heating apparatus forms an immediate hot water supply circulation path by an inner path and an outer path as being combined, the inner path including a heating mechanism including a combustion mechanism and a heat exchanger, the outer path bypassing the hot water supply faucet outside the water heating apparatus. The outer path includes a crossover valve. In the immediate hot water supply operation mode, a controller introduces intermittent combustion to control a detection temperature detected by the temperature sensor to a set temperature. In intermittent combustion, a minimum combustion state and a combustion stop state are alternately provided. In the minimum combustion state, a quantity of heat output from the combustion mechanism is reduced to a minimum value.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]The present disclosure relates to a water heating apparatus and a water heating system and more particularly to a water heating apparatus and a water heating system both with an immediate hot water supply function.Description of the Background Art[0002]A water heating apparatus of one form is equipped with what is called an immediate hot water supply function for outputting hot water at an appropriate temperature immediately after start of hot water supply even after hot water supply has been off for a long period of time. Normally, in order to achieve the immediate hot water supply function, a mode in which a circulation path that goes through a heat source also while hot water supply is off is formed (an “immediate hot water supply operation mode” below) should be provided.[0003]U.S. Pat. No. 6,536,464 discloses a configuration for forming a circulation path for the immediate hot water supply function by externally connecting ...

AI Technical Summary

Benefits of technology

The purpose of the patent is to make it easier to control the temperature in a hot water supply system. This is done by connecting a crossover valve to a circulation path. The goal is to make the operation more stable and efficient.

Problems solved by technology

In a circulation path to which a crossover valve (or a thermal valve) is connected, however, a pressure loss in a path that passes through a wax thermostatic element is high and hence a circulation flow rate is relatively low.

Therefore, in a water heating apparatus including a combustion mechanism such as a combustion burner as a heat source, there is a concern about difficulty in temperature control by adjustment of a quantity of heat generated by the combustion mechanism (an amount of fuel that is burnt).

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