Absorption refrigerator boiler construction

In an absorption refrigerating apparatus having a single pipe boiler construction, and that operates with inert gas in which absorption solution rich in refrigerant is lifted in a central pump pipe in which vapor is expelled and the weak solution formed therein flows downwardly in an outer pipe, at least one heat source being arranged in heat-conductive contact with the outside of said outer pipe and heat from the heat source being conducted through the weak solution in the outer pipe to the pump pipe and its contents, the improvement comprising:

• a first means for supplying heat directly by conduction to said outer pipe, and a deformed section of said outer pipe which engages said pump pipe and forms a second direct heat-conductive connection arranged between the outer pipe and said pump pipe.