Idk about the rest of that spider web but the red thing is a pump for the radiators I think. Doesn't have anything to do with the tap water.
The grundfos thing is a central heating pump.
At a guess black box is the shower pump, when you turn the shower off is the water as powerful as when the shower is on or is the water coming out at a low pressure?
@lynx started
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Idk about the rest of that spider web but the red thing is a pump for the radiators I think. Doesn't have anything to do with the tap water.