Yes, that is correct. There is a few ways to flush the system depending on the installation so this can be explained this during Pre Installation Walkthrough Survey. It’s important that the flow of water around the central heating system is swift. The quicker the hot water flows around the central water heating system the quicker this returns to the heat pump the warmer the water the less work for the heat pump. Sometimes there can be an extra pump installed and a filter system depending on the size of the installation. The heat pump has a built in water pump and filter but this can be doubled up to improve the efficiency overall. All of this will help improve the efficiency of the renewable heating system being installed.
Contact Green Tech Surveys if you would like more information about air source heat pumps.