No or low water pressure upstairs only
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Most likely cause & what to check
If pressure is fine downstairs but poor upstairs, this indicates a gravity-fed system or a pressure issue specific to the upstairs cold circuit rather than a whole-house mains problem.
If you have a cold water storage tank in the loft: go into the loft and check the tank level. If low, check the ball valve is working. If the tank is on a lower platform or the tank was installed incorrectly close to the ceiling, there is very little head of water to drive pressure — a pump is the solution.
Check for any partially closed isolator valves on the pipework serving upstairs — these are often found in airing cupboards or under bathroom sinks. Open fully.
Check the shower head for limescale blockage — a clogged shower head appears as very low flow. Remove and soak in white vinegar.
In properties on mains pressure throughout (combi boiler or unvented cylinder): check if upstairs cold taps are on a branch off the rising main. A scale blockage in a 15mm branch pipe can dramatically reduce pressure at just those outlets.
If the tank level is fine and all valves are open, a shower pump (£100–£200) fitted by a plumber will boost upstairs pressure effectively.
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