| abstract |
A warm-water generating apparatus ( 1 ) uses, as a refrigerant, a mixed refrigerant containing at least 1,2-difluoroethylene (HFO-1132(E)). The warm-water generating apparatus ( 1 ) includes a compressor ( 21 ), a heat-source-side air heat exchanger ( 24 ), an expansion valve ( 23 ), and a use-side water heat exchanger ( 22 ). The water heat exchanger ( 22 ) causes the mixed refrigerant flowing therein and first water to exchange heat with each other to heat the first water. |