Shower pressure suddenly low: what to check
Quick answer
A shower that’s suddenly lost pressure, rather than gradually weakening, often has a specific and findable cause — a clogged showerhead, a kinked hose, or a valve that’s been partly closed. Check the showerhead and hose first, since these are the easiest and safest things to rule out. If pressure is low throughout the house too, or you can’t find an obvious cause, a plumber can help.
Safety first
- If you’re dealing with an electric shower, don’t attempt any work on it yourself — this is electrical work for a qualified professional.
- If you smell gas or suspect carbon monoxide near a combi boiler feeding the shower, leave the property and call 0800 111 999.
Full checklist: Safety guidance
What you may notice
- Only the shower is affected, other taps are normal — suggests a local cause, such as a clogged showerhead or a partly closed isolation valve for that shower.
- Pressure is low everywhere in the house, not just the shower — this points to a wider issue — see our guide on low water pressure in the house.
- The showerhead has visible limescale or mineral deposits — this is a common and easily checked cause, especially in hard water areas.
- The flexible hose looks kinked or twisted — a kinked hose can restrict flow even if everything else is working normally.
These are possible explanations, not a confirmed diagnosis. An engineer can confirm the exact cause on inspection.
Safe checks to make, in order
- Check the showerhead for visible limescale or blockage. Unscrew it if possible and look for mineral build-up in the small holes.
- Check the hose for kinks or twists. A kinked hose is an easy, safe fix — simply straighten it out.
- Check other taps in the house. This tells you whether the issue is isolated to the shower or part of a wider pressure problem.
- If there’s a shower isolation valve, check it’s fully open. Some showers have a small isolation valve nearby that can be accidentally partly closed.
What you can do safely
- Checking and cleaning the showerhead if it looks limescaled.
- Straightening out any kinks in the hose.
- Checking whether other taps are also affected.
- Checking any accessible isolation valve is fully open.
When to call a professional
- The showerhead and hose are both clear but pressure is still low.
- Pressure is low throughout the house, not just the shower.
- You suspect an issue with an electric shower unit itself.
- The problem started alongside other plumbing symptoms, like noises or leaks.
What to tell the engineer
- Whether it’s just the shower affected, or other taps too.
- Whether you’ve already checked the showerhead and hose.
- Whether the drop was sudden or gradual.
- The type of shower you have (electric, mixer, or fed from a combi/system boiler), if known.
FAQs
How do I clean a limescaled showerhead?
Many showerheads can be unscrewed and soaked in a descaling solution or a vinegar and water mix to dissolve mineral build-up, then rinsed before refitting. If yours doesn’t come apart easily, a replacement showerhead may be simpler.
Could my shower’s flow restrictor be the cause?
Some showerheads have a flow restrictor designed to save water, which can occasionally become blocked as well. It’s worth checking alongside the rest of the showerhead when you clean it.
Is a sudden drop different from a gradual one?
Yes — a sudden drop often has a specific, findable cause like a kink or blockage, while a gradual decline over weeks can suggest a build-up of limescale or a slowly developing supply issue.
Should I be worried if it’s just my shower and nothing else?
Not usually — an isolated issue with one fixture is generally a simpler, local fix rather than a sign of a wider problem.
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