Absorption heat pumps use an ammonia-drinking water absorption cycle, instead of a vapor-compression cycle, to transfer heat. Ammonia is the refrigerant, and drinking water could be the absorber. The ammonia condenses at on the list of system’s coils to launch heat and evaporates at another coil to absorb heat. Also, https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/