Why Has My Shower Pressure Suddenly Become Weak?
For a shower that used to have acceptable flow but has become noticeably weaker, either gradually or suddenly, while the rest of the shower still operates.
What this usually means
A shower that suddenly becomes weak is often being restricted somewhere between the water supply and the showerhead. Limescale in the head, a kinked hose, a dirty filter or a partly closed isolation valve are common local causes. If all taps in the home have also lost pressure, the problem is more likely to be the incoming supply, a stop valve, a leak or wider plumbing issue. The quickest useful test is to compare the shower with nearby taps before dismantling anything.
What may be causing this
The showerhead is restricted by limescale
Clues: Some spray holes are blocked, jets fire in odd directions or flow has fallen gradually in a hard-water area.
What to do: Remove and clean the showerhead using the manufacturer's descaling method.
The hose is kinked, damaged or collapsing internally
Clues: Flow changes when the hose position moves or the outer hose looks twisted or damaged.
What to do: Straighten the hose and replace it if damaged or internally restricted.
A filter or shower inlet is partially blocked
Clues: The head and hose are clear but the shower still has low flow, especially after plumbing work or a water-supply interruption.
What to do: Follow the shower manufacturer's user-service guidance. Some filters are accessible; others require professional servicing.
The incoming water supply has lost pressure
Clues: Nearby taps and other fixtures are also weaker than normal.
What to do: Check that the main stop valve and any accessible isolators are fully open. If the whole property is affected, check for local supply issues or a plumbing leak.
How to check what is happening
The problem is probably local to the showerhead, hose, filter or shower valve.
Limescale is likely restricting flow through the head.
The hose itself may be restricting water.
Investigate the incoming supply, stop valve or a possible leak rather than the shower alone.
Can you fix this yourself?
Cleaning a removable showerhead, checking the hose and comparing nearby taps are safe homeowner checks. User-accessible filters can be cleaned only where the manufacturer specifically allows it. Internal electric shower parts, pumps and fixed shower valves should be left to a competent professional.
- Measuring jug
- Shower manufacturer manual
- Descaling product approved for the showerhead
- Torch
What you can safely try
- 1
Compare the shower with nearby taps first
Run a nearby basin or bath tap and compare the flow. If those are normal, you can focus on the shower rather than the entire water supply.
- 2
Clean the showerhead
Remove limescale using the manufacturer's method and clear blocked spray holes without damaging them.
- 3
Check the hose for restriction
Straighten any kinks and look for crushing or damage. If the manufacturer allows a head-off test, run the hose safely into the tray or bath and compare the flow.
- 4
Check obvious user-operated valves
If recent plumbing work was carried out, make sure accessible isolation valves and the main stop valve have not been left partly closed.
- 5
Get the shower serviced if the external checks are clear
A plumber or shower engineer can check filters, cartridges, pumps or internal restrictions without guessing at replacement parts.
Call a plumber if…
- The shower is electric and diagnosis would require opening its casing.
- There is water leaking from the shower unit or pump.
- The RCD or breaker trips.
- Several taps across the property have suddenly lost pressure.
- The low pressure remains after the head and hose are confirmed clear.
Get the right professional.
This problem can have more than one cause. Start with the checks above: a plumber is the usual first route, while a electrician may be more appropriate when the clues point that way.
Sources used for this guide
We prefer primary UK guidance, regulators and manufacturers for technical and safety-sensitive claims.
- How to increase water pressure in your showerMira Showers
- The Ultimate Guide to Water PressureMira Showers
Last reviewed: 31 August 2026. Home Manual updates review dates only when the substance of a guide is checked or changed.