To enhance a heat collection rate in a GAX unit (absorption type regenerative heat exchanger) of an absorption type heat pump and inhibit an increase in the cost accompanying the improvement in the heat collection rate.

A vaporizer is classified into two types: or more particularly, a low temperature vaporizer 35a and a high temperature vaporizer 35b where the low temperature vaporizer 35a vaporizes refrigerants at a temperature required to provide a specified cool water and the high temperature vaporizer vaporizes refrigerants at a higher temperature. An absorber is classified into two types: One is a high pressure absorber 50b, which is internally furnished with a GAX unit (absorption regenerative heat exchanger) is connected to the high temperature vaporizer while the other is a tow temperature absorber 50a which is connected to the low temperature absorber 35a. The bottom of the high pressure absorber 50b is connected to a spray device 51a, which is internally furnished with the top of the low pressure absorber 50a by way of a pressure reducing valve 59 and refrigerant vapor generated at the high temperature vaporizer 35b is introduced to the high pressure absorber 50b while refrigerant vapor generated at the low temperature vaporizer 35a is introduced to the low pressure absorber 50a.