A weak shower has several possible causes. Here is how to diagnose low water pressure and the best fixes for each system.
A trickling shower is frustrating, but the fix depends on the cause. Here is how to diagnose it and what actually works.
Start Simple
Limescale-blocked shower heads and flow restrictors are the most common and easiest fix — descale or replace the head first before anything drastic.
Know Your System
- Combi boiler — pressure comes from the mains. Low pressure may be a mains issue, a small-bore pipe, or too many outlets used at once
- Gravity (tank) system — pressure depends on tank height; a shower pump can transform performance
- Unvented cylinder — usually strong mains-pressure showers; weak flow suggests a fault or restricted pipework
The Right Fix
Gravity systems benefit from a pump; combi systems may need pipework upgrades or a system change; blocked heads just need cleaning. Matching the fix to the system is everything.
When to Upgrade
If low pressure affects the whole home, an unvented cylinder or accumulator gives strong, consistent flow everywhere — worth considering during a renovation.
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Frequently Asked Questions
Why is my shower weak but the taps are fine?
Often a blocked shower head or flow restrictor, or a shower not suited to your water system. Clean the head first; if it persists, the system may need attention.
Can I boost a combi boiler shower with a pump?
No — combi systems are mains-pressure and must not be pumped. Improving them means addressing pipework or the water system itself.
