| 摘要 |
PROBLEM TO BE SOLVED: To provide a water heater which extends the service life of a scale control means.SOLUTION: A water heater includes: a hot water tank 57 which stores hot water; a water heater/heat exchanger 52 which heats hot water from the hot water tank 57; an inflow pipe 64 and an outflow pipe 65 which connect the hot water tank 57 and the water heater/heat exchanger 52; an inflow temperature detecting means 67 which detects a temperature of inflow water flowing into the water heater/heat exchanger 52; a control means 83; and a scale control means 76 which can be attached to and detached from the inflow pipe 64 and which adds a scale inhibitor 80 which prevents scale generation. The temperature of the inflow water in terminating heating operation for heating the hot water of the hot water tank 57 by the water heater/heat exchanger 52 is changed according to whether the scale control means 76 has been attached or not, thereby extending the service life of the scale inhibitor and reducing replacement or replenishment and maintenance cost. |
