All-year outdoor shower - component selection

I want to build a simple outdoor shower with warm and cold water that will work in the winter with minus 20 degrees. The project is to select the required components (magnetic valves and controls) available on the European market. Further, an installation guide for the selected. Professional electricians and plumbers will install it. No need to worry about shower head and pipes! Result can be a word file with supplier links / pictures and an installation instruction