To provide a hot-water storage type water heater capable of efficiently performing heating operation while suppressing scale buildup on a piping inner face when being shifted from boiling up operation to heating operation (reheating operation or the like of bathtub water).
In the hot-water storage type water heater 100 capable of executing: boiling-up single operation for boiling up water in a hot-water storage tank 10 by using a heat pump unit 60; hot-water storage reheating operation for exchanging heat between a high-temperature water stored in the hot-water storage tank 10 and a bathtub water in a utilization side heat exchanger 22 to heat the bathtub water; and reheating operation for protecting a boiling-up heat exchanger for executing cooling operation of the heat pump unit 60 by combination of the hot water storage reheating operation, switching to the reheating operation for protecting the boiling-up heat exchanger is performed when reheating request is performed during the boiling-up single operation. Switching to the hot water storage reheating operation is performed after the boiling-up heat exchanger 62 is cooled by the reheating operation for protecting the boiling-up heat exchanger.
SAKUMA TOSHIYUKI
YANAGIMOTO KEI
WATANABE NAOKI
IIDA KYOHEI
SHIMIZU YOSHIRO
TANZAWA SATOSHI
| JP2010019477A | 2010-01-28 | |||
| JP2009068825A | 2009-04-02 |
Hideki Takahashi
Yasuo Koizumi