That’’s how most of the older houses I’ve been in while in the UK are done, copper pipe ran in plain sight to the few copper radiators they have (doesn’t get real cold in the winter) and most houses the pipes are just painted to match the wall color. Kinda weird though, they have just enough pressure to fill a storage tank in the attic with water, the showers have an add on unit/pump on the shower wall to up the pressure enough to have a decent shower. Heating and DHW are the same system which is why it’s all copper, not unusual for a house thats empty for very long to get the plumbing completely stripped by scrappers.
On the other hand with just enough water pressure to fill each houses attic cistern the town/village doesn’t need as much water pressure on the mains so less repairs. Usually in the garden (backyard here) there will be a pipe coming thru the wall just under the eaves, this is the overflow pipe in case the cistern fill valve malfunctions, the homeowner/tenant knows immediately then something is wanky.