A shower that fades to a trickle when someone turns on the kitchen tap is more than an everyday irritation. Low water pressure causes can range from a simple blocked shower head to a fault affecting the wider plumbing system, and the right repair depends on where the pressure is being lost. For homeowners in Burgess Hill, Haywards Heath and across Sussex, identifying the pattern is the best place to start.
Pressure and flow are often used interchangeably, but they are not quite the same. Water pressure is the force pushing water through your pipes. Flow is the amount that reaches the tap or shower over a given time. A restriction in a tap can reduce flow even where the incoming pressure is sound, while a supply or system problem can affect both.
Low water pressure causes: start with the pattern
Before assuming there is a major fault, consider whether the problem affects one outlet, one part of the home, or every tap. This gives a useful first indication of the likely cause and helps a plumber diagnose the issue efficiently.
If just one tap or shower is affected, the fault is often local to that fitting. If hot water is weak but cold water remains normal, the problem may sit within the boiler, cylinder, pipework or a valve serving the hot-water supply. When both hot and cold water are poor throughout the house, the incoming mains supply, a pressure-reducing valve, a leak or shared demand may need investigation.
It is also worth noting when the problem occurs. Pressure that drops only at busy times can point to demand from other appliances or a local supply issue. A sudden and permanent change deserves more prompt attention, particularly if you can hear water running when nothing is in use.
Common causes inside the home
Blocked tap aerators and shower heads
Limescale, grit and debris collect gradually in tap aerators and shower heads. Sussex homes in hard-water areas can be particularly prone to this. The result is usually a weak or uneven spray from one fitting rather than a whole-house problem.
A removable shower head can sometimes be cleaned carefully, following the manufacturer's instructions. However, avoid forcing old fittings apart or using harsh products that may damage finishes and seals. If cleaning does not restore the flow, the internal cartridge, hose or valve could be restricting water instead.
Partly closed isolation or stop valves
Most taps, toilets and appliances have small isolation valves on their supply pipes. A main internal stop valve is often located under the kitchen sink or close to where the water supply enters the property. If a valve has not been fully reopened after previous work, water may still pass through, but at a reduced rate.
This is a simple cause, yet it needs a careful approach. Older valves can seize, leak or fail when disturbed. Do not force a stiff stop valve, especially if you are unsure whether it is the main shut-off for the property. A qualified plumber can check the valve condition and replace it where necessary.
A failing tap, mixer valve or shower cartridge
Modern mixer taps and thermostatic showers use internal cartridges to blend and control water. Wear, scale and debris can affect these components, causing poor flow, temperature fluctuations or a shower that runs weakly only on one setting.
Replacing a cartridge can be more cost-effective than changing an otherwise good-quality fitting, although compatible parts are not always readily available. The age and condition of the fitting matter. For a tired shower or bathroom due for an upgrade, replacement may offer better long-term reliability than repeated small repairs.
Restricted pipework
Older properties may have narrow, corroded or poorly altered pipework. Internal corrosion and scale reduce the effective diameter of pipes over time, much like a narrowing passage. This can be especially noticeable on long pipe runs, loft conversions and extensions where new fittings have been added to an existing system.
Pipework changes should be designed around expected demand, rather than simply using the nearest available connection. A powerful shower, additional bathroom or larger household can expose limitations that were never obvious when the home had fewer outlets.
Hot-water pressure problems and your heating system
The type of hot-water system in your home makes a significant difference. A combi boiler heats water directly from the mains, so its hot-water performance is limited by incoming mains flow and the boiler's capacity. If several outlets are used at once, the available hot-water flow is shared. This is not always a fault, but it can be frustrating in a busy family home.
A gravity-fed system with a cold-water storage cistern relies on height to create pressure. Showers upstairs may therefore feel less powerful than a mains-fed cold tap downstairs. A suitable pump can improve performance in some properties, but it must be selected and installed correctly. The wrong pump can create noise, strain fittings or fail to deliver the expected improvement.
Unvented cylinders store hot water under mains pressure and can provide strong flow where the incoming supply is adequate. They include important safety controls and should only be inspected or serviced by a suitably qualified engineer. Reduced hot-water flow from a cylinder can arise from a faulty pressure-reducing valve, blocked filter, scale or another system component.
If the boiler's pressure gauge is low, that is a separate sealed-heating-system issue. It can affect radiators and heating performance, but it does not normally explain weak water from your hot taps. Treating the two as the same problem can lead to unnecessary adjustments and missed faults.
Hidden leaks and supply issues
A leak does not always show as a stain on a ceiling or water on the floor. A small leak beneath a floor, behind a wall or on an underground supply pipe can reduce pressure while causing damage out of sight. Warning signs include damp patches, a musty smell, unusually high water use, a water meter that continues to move when all outlets are off, or a boiler that repeatedly loses pressure.
If you suspect a leak, turn off water appliances and taps, then check whether the meter changes over a short period. Do not remove panels, lift floors or cut into walls without a clear plan. Early professional investigation can limit damage to finishes and prevent a modest repair becoming a larger property issue.
Sometimes the issue sits outside the home. Planned work, a burst main or unusually high neighbourhood demand can temporarily affect the mains supply. Ask nearby households whether they have noticed a similar change. If they have, your water supplier may be investigating an area-wide fault. If the issue is confined to your property, the responsibility is more likely to be within your private supply pipework or internal plumbing.
When low pressure needs professional attention
A weak tap after limescale has built up may be straightforward. Persistent or widespread pressure loss is different. It is sensible to arrange an inspection when the change is sudden, affects several outlets, comes with damp or leak symptoms, or involves a boiler, unvented cylinder or shower pump.
Turner Plumbing & Heating can assess the supply, valves, fittings and system layout before recommending a repair. This matters because pressure boosters, pumps and replacement fittings are not universal answers. The most suitable solution should protect the existing system, suit your household's water use and provide dependable performance rather than a short-lived improvement.
Avoid repeatedly topping up a boiler or altering pressure controls in an effort to improve tap flow. Likewise, do not ignore a dripping valve, a noisy pump or water that is discoloured after a pressure change. These details can help pinpoint the underlying problem.
A home should not require a carefully timed routine just to run a comfortable shower or fill the kettle. Paying attention to where and when the flow drops gives a clear starting point, while a properly diagnosed repair helps restore the reliable water supply your household depends on.