Hot water supply heating device

A hot water supply heating device, comprising a heat exchanger that heats tap water supplied from a water supply passage by heat exchange with a heat medium for heating and outputs hot water to a hot water outflow passage;

• a distribution valve installed in the water supply passage;
• a bypass passage branched from the water supply passage at the distribution valve and connected to the hot water outflow passage;
• a control part that adjusts a distribution ratio to the heat exchanger and the bypass passage by adjusting a valve position of the distribution valve so as to supply hot water at a hot water supply set temperature;
• and a notification part that notifies by display or sound, the hot water supply heating device comprising:
• a water supply temperature detection part that detects a water supply temperature of tap water in the water supply passage;
• a hot water outflow temperature detection part that detects a hot water outflow temperature of hot water at an outlet of the heat exchanger;
• and a hot water supply temperature detection part that detects a hot water supply temperature of hot water at a downstream side of a connection part with the bypass passage in the hot water outflow passage,
• wherein the control part comprises a standard valve position setting part that sets a standard valve position of the distribution valve corresponding to a combination of the hot water supply set temperature and the water supply temperature, and when hot water is supplied in a normal mode that adjusts the valve position such that the hot water supply temperature converges to the hot water supply set temperature, in a case where an adjustment amount from the standard valve position set by the standard valve position setting part to a current valve position converged to the hot water supply set temperature exceeds a preset adjustment normal range, the control part transitions according to the adjustment amount to any one of a first mode that performs notification by the notification part to prompt cleaning of the heat exchanger and permits hot water supply similar to the normal mode;
• a second mode that performs the notification and permits hot water supply with a lowered hot water outflow temperature;
• or a third mode that performs the notification and prohibits hot water supply.