Absorption heat pumps (AHP) have been used since the late 19th century and a large body of scientific and technical literature has been devoted to the fundamental principles, engineering design and application of those devices [1], [2] and [3]. Due to volatile energy prices and environmental concerns, these systems have received more attention in the past two decades. AHPs supplied with waste energy or water heated through solar collectors are attractive options, but only if they are correctly implemented. Such devices are environmentally friendly since they use working fluids which do not cause ozone depletion. For the majority of AHPs used in industrial applications, H2O–LiBr is the working fluid pair of choice since it is not toxic, has a high enthalpy of vaporization and does not require a rectification step.