Being an air to drinking water monobloc heat pump, it operates successfully applying eco-friendly R290 refrigerant, offering sustainable heating with an impressive A+++ Power efficiency rating. Break up Techniques: Have 1 coil and admirer inside and one exterior. Supply and return ducts connect with the indoor central coil and admirer. https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/