Shower Repair versus Replacement in London: How to Decide
Deciding whether to repair or replace a faulty shower in a London property depends on the type of shower, the fault, the age, and the local water hardness. This guide works through the decision for electric showers and mixer showers.
The Core Decision Framework
The decision between repairing and replacing a faulty shower comes down to four factors: the cost of the repair relative to a new unit, the age and condition of the existing shower, the fault history, and the water hardness at the property. In London, water hardness adds a dimension that does not apply in most other UK cities. London water is exceptionally hard — typically 300 to 400 parts per million as calcium carbonate — and this accelerates limescale damage to shower components, particularly electric shower heating elements, in ways that affect the repair-versus-replace decision significantly.
Electric Showers: When to Repair
An electric shower that has developed a single fault — no water flow, tripping the electrics, water not heating — is a candidate for repair if it is under five years old and has not had previous repairs. The most common repairable faults are a blocked inlet filter (cleared in fifteen minutes), a failed flow switch (part typically £20 to £40, fitting thirty minutes), and a failed thermostatic coil (part £30 to £60, fitting forty-five minutes). These are all single-component failures that a plumber can diagnose and fix in a single visit for £80 to £150.
A heating element that has failed once in a shower over five years old in a London hard water area is a judgment call. The element failure indicates that limescale has built up to the point where the element overheated. Replacing the element restores function, but the underlying limescale problem remains — the new element will accumulate scale at the same rate as the old one unless the property has a water softener or the shower is regularly descaled. If the shower is six to ten years old and the element has failed once, repair makes sense. If the shower is over ten years old or the element has failed twice, full replacement is usually more economical.
Electric Showers: When to Replace
An electric shower over ten years old in a London property should typically be replaced rather than repaired, regardless of the specific fault. The heating element, printed circuit board, solenoid valve, and flow switch are all subject to wear, and once a shower reaches this age in hard water conditions, multiple components are close to the end of their service life simultaneously. Paying £100 to repair an element on a twelve-year-old shower and then facing a PCB failure six months later wastes money that would be better spent on a new unit from the outset.
An electric shower that has tripped the RCD multiple times or caused nuisance tripping on a shared circuit should be replaced regardless of age. Repeated RCD trips indicate progressive element failure or wiring deterioration inside the unit, and continuing to use a shower in this condition is a genuine safety risk. New electric shower installation requires a dedicated 30A or 45A circuit from the consumer unit — Part P notifiable electrical work. Prestige Engineers are qualified for both the plumbing and electrical elements of the installation and issue a Part P certificate on completion.
Thermostatic Mixer Showers: When to Repair
Thermostatic mixer showers have significantly longer service lives than electric showers — a quality thermostatic valve from Grohe, Hansgrohe, or Aqualisa can last twenty or more years with cartridge replacements. The thermostatic cartridge is a sacrificial component designed to be replaced. A mixer shower with poor temperature control or intermittent running cold is almost always a cartridge replacement — a thirty-minute repair costing £100 to £150 including the cartridge. Dripping from the shower head is usually worn spindle O-rings or a ceramic disc cartridge, both of which are straightforward and inexpensive repairs. There is rarely a case for replacing a thermostatic mixer valve body in a London property unless the body itself is physically damaged or corroded through.
Power Showers and Digital Showers
Power showers — mixer showers with an integrated pump — are more complex to repair than standard mixers because the pump adds a further component that can fail. A power shower where the pump is worn or cavitating is best replaced with a modern equivalent. Digital shower systems from Aqualisa or Mira have modular controllers that can be replaced without replacing the valve or the plumbing connections — these are repaired at the controller level rather than the valve level. Contact Prestige Engineers for shower repair and replacement assessment across all London boroughs.