Works by using electronic enlargement valve to precisely Handle the move of R290 refrigerant into the evaporator in addition to a four-way valve to divert the refrigerant stream for your defrost Procedure The Haier Air to Drinking water Heat Pump variety takes advantage of free of charge renewable energy from https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/