As the many parts including pump, three-way valve, growth vessel, Handle unit and electrical circulation and back-up heaters are contained in the indoor unit, there isn't a need to have to setup these individually having a hydrosplit. Employing electrical power, the pump compresses the liquid to increase its temperature. It https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/