If your shower pressure is low but your taps are fine, the problem is usually somewhere in the shower itself or the pipework that feeds it. Common causes include a scaled shower head, a kinked hose, a flow restrictor or a fault inside the mixer valve. Because the taps are working well, the main supply is less likely to be the cause.
Shower Head, Hose and Flow Restrictor
The shower head is the easiest place to start. Limescale can build up in the small holes, so water comes out in weak or uneven jets. Soaking the head in a descaling solution or gently cleaning the nozzles often helps.
The hose is the next thing to look at. A hose that is kinked, twisted or damaged inside can restrict flow. Some shower heads and hoses also contain a flow restrictor, a small part designed to save water. If you fitted a new head and the pressure dropped, this may be the reason.
Mixer Valve, Cartridge and Filters
Many mixer showers have a cartridge inside the valve that blends hot and cold water. Over time, scale or debris can build up in the cartridge, or in small filters where the pipes join the valve. This may reduce flow or make the temperature hard to control.
Some valves also include small parts that balance the hot and cold supply. If these become blocked or worn, the shower may run weakly even though nearby taps seem fine. Opening up a mixer valve takes care and the right parts, so this is usually a job for a plumber. Faults inside the valve are a common reason for shower repair.
Gravity-Fed Systems and Supply Imbalance
In some homes, hot water is fed by gravity from a cold water tank in the loft. The pressure depends on how high the tank sits above the shower. If the shower is on an upper floor and close to the tank’s height, there may be very little pressure to push water out, while taps downstairs seem perfectly normal.
A mixer shower can also struggle if the hot and cold supplies are at very different pressures, for example mains-fed cold water with tank-fed hot water. The valve may restrict flow to keep the temperature steady. Other restrictions, such as a partly closed isolation valve on the shower supply, narrow pipework or a long pipe run, can add to the problem.
Electric showers are a different type and involve electrical connections, so any work on their wiring should be left to a qualified electrician.
When to Get Help
If cleaning the head and checking the hose has not helped, the cause is probably deeper in the valve or pipework. A plumber can test the hot and cold supplies, check the valve and look at how the shower is fed. For help with low shower pressure in Swindon, a proper assessment can save trying several fixes that do not work.
If your mixer shower is weak while your taps run well, Emergency Plumber Swindon can take a look. Call us on 01793 569521 to arrange a visit.