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SHOWER & BATH PLUMBING

Shower Pressure Low

Low shower pressure is commonly caused by a blocked head, kinked hose, restricted filters, partly closed valves, a scaled cartridge or weak supply flow.

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Stop using the shower or bath if water is reaching ceilings, walls or electrical fittings

Isolate local water supplies where possible. Electric showers must be isolated electrically before any internal work, and temperature faults that create scalding risk should be treated as urgent.

MOST LIKELY CAUSES

Start with these

Blocked shower head Scale and debris restrict the spray holes.
Kinked or collapsed hose The hose can narrow internally or bend sharply.
Blocked filters or cartridge Mixer inlets and thermostatic cartridges can clog.
Low supply pressure The wider hot or cold supply may be weak.
◫ Symptom variations Match the exact pressure, temperature or leak pattern. ⌄
  • Only the shower is weak
  • One temperature setting has lower flow
  • Pressure drops when another tap opens
  • Spray pattern is uneven
  • Problem developed gradually
✓ Quick checks Simple checks before dismantling shower or bath components. ⌄
  1. Identify whether the problem affects pressure, temperature, drainage or leakage.
  2. Check nearby hot and cold outlets for similar symptoms.
  3. Clean accessible shower heads, filters and waste covers.
  4. Inspect hoses, seals, trays and accessible joints.
  5. Stop testing immediately if water appears below or near electrics.
If the cause is isolated: keep the affected fitting out of use until repaired.
If the leak is concealed or temperature is unsafe: arrange professional inspection.
1 Step 1 — Clean the shower head Use controlled tests and stop if water reaches ceilings or electrics. ⌄

Process

Remove and descale the head, then test the hose outlet carefully.

Success looks like: Flow improves at the hose.
Escalate when: If still weak, check the hose and mixer.
2 Step 2 — Inspect the shower hose Use controlled tests and stop if water reaches ceilings or electrics. ⌄

Process

Look for kinks, crushing and internal collapse.

Success looks like: A restricted hose is identified.
Escalate when: Replace rather than patch a damaged hose.
3 Step 3 — Compare hot and cold supply flow Use controlled tests and stop if water reaches ceilings or electrics. ⌄

Process

Check nearby outlets and whether one side of the mixer is weaker.

Success looks like: The fault is narrowed to one supply or the shower valve.
Escalate when: A cartridge or filter may need servicing.
⌁ Common causes explained Why shower and bath faults develop. ⌄

Low shower pressure is commonly caused by a blocked head, kinked hose, restricted filters, partly closed valves, a scaled cartridge or weak supply flow.

Shower and bath faults often depend on when water is flowing, draining or hitting a sealed surface. Controlled separate tests help distinguish supply, mixer, waste and enclosure faults.

⌘ Advanced diagnostics Plumber or appliance-engineer checks. ⌄
  • Clean inlet filters and non-return valves.
  • Descale or replace thermostatic cartridge.
  • Check service valves are fully open.
  • Measure dynamic pressure and flow.
  • Inspect pump or boiler flow where fitted.
▣ Parts that may need replacing Common components linked to this fault. ⌄
  • Shower head
  • Shower hose
  • Inlet filters
  • Thermostatic cartridge
  • Service valve
! When to call a plumber or engineer Conditions that should end basic troubleshooting. ⌄
  • Water is leaking through a ceiling or near electrical equipment.
  • The shower temperature is dangerously hot or unstable.
  • An electric shower has an internal heating or power fault.
  • The tray, bath or concealed pipework must be removed for access.
  • A thermostatic cartridge cannot be calibrated safely.
  • The fault returns after basic cleaning or seal replacement.
? Frequently asked questions Common questions about shower and bath faults. ⌄

Why does a shower drip after it is turned off?

Large heads and hoses can hold water temporarily. Continuous fresh dripping points to a leaking control valve or cartridge.

Can failed sealant cause a ceiling leak?

Yes, but waste joints, pipe connections and tray movement must also be ruled out.

Why does shower temperature change when another tap is used?

The hot and cold pressures may be unbalanced or the thermostatic cartridge may not compensate correctly.