To increase temperature rise of water in a delivery gas region of a refrigerant delivered from a compressor, to lower a condensation temperature correspondingly, and thereby, to achieve efficient operation.
The heat pump type water heater is provided with a refrigerating cycle constituted by successively connecting a first water heat exchanger 3, a second water heat exchanger 4, an expansion valve 5, and an air heat exchanger 7 to a compressor 1 having an injection port 1a through a refrigerant pipe 2; a hot water supply pipe 10 for feeding water to the first and second water heat exchangers 3 and 4 in order to supply hot water; and an injection circuit 8 for connecting a refrigerant outflow side of the first water heat exchanger 3 and the injection port 1a of the compressor 1. The gas refrigerant is cooled in the first water heat exchanger 3, and the gas refrigerant is condensed in the second water heat exchanger 4, and the injection circuit 8 injects a part of the refrigerant gas flowing out of the first water heat exchanger 3 to the compressor 1.
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto