As every one of the elements including pump, three-way valve, expansion vessel, Command unit and electrical flow and back-up heaters are contained throughout the indoor unit, there is no will need to install these individually which has a hydrosplit. They set to work and at the end of the day https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/