Installing an electric shower is one of the most effective ways to modernise a bathroom, providing instant hot water without the need for a bulky tank or complex plumbing system. This guide walks through the entire process, from choosing the right unit to the final safety checks, ensuring a professional and reliable result.
Understanding How Electric Showers Work
Unlike mixer or power showers, an electric shower is a self-contained unit that heats water only when it is running. Cold water enters the unit, passes over a high-powered heating element, and exits as hot water, meaning the supply is continuous as long as the tap is open. This independence from a hot water tank makes them ideal for homes with limited space or inconsistent water heater performance.
Planning Your Installation
Before turning on the mains water, careful planning is essential to meet safety standards and building regulations. The primary considerations involve electrical supply, water pressure, and physical space.
Electrical Requirements
Electric showers are high-power appliances that typically require a dedicated circuit with an amperage rating of 45 amps or higher. It is crucial to verify that your home’s consumer unit can handle this load and that the wiring conforms to the appropriate cable specifications, usually 6mm² or 10mm² depending on the rating. A Residual Current Device (RCD) must be installed for personal protection.
Water Pressure Assessment
Most electric showers perform best with a minimum water pressure of 1 bar. If your property has low pressure, the shower may struggle to deliver an adequate flow, resulting in a weak stream. In such cases, a model with a built-in pump or a different type of shower system might be a better solution.
Step-by-Step Installation Process
While some homeowners with DIY experience may attempt this project, it is highly recommended to hire a Part P certified electrician and plumber to ensure compliance with safety laws. The process generally follows these steps.
Isolate the water and electricity supplies to the installation area.
Secure the shower bracket to the wall using appropriate fixings, ensuring it is level.
Connect the cold water inlet pipe to the household supply.
Wire the unit to the dedicated electrical circuit, adhering to colour coding (brown for live, blue for neutral, and green/yellow for earth).
Fit the shower hose and attach the shower head and tap handle.
Turn the water back on and check for leaks at all connection points.
Safety and Compliance
Electrical safety is non-negotiable when dealing with water and high wattage. All work must comply with the IEE Wiring Regulations (BS 7671) and should be verified with a test certificate. The shower must be isolated from other circuits to prevent power surges, and the correct fuse rating must be used to prevent overheating.
Common Challenges and Solutions
Even with a straightforward design, installation can present hurdles. One common issue is finding a suitable location; the unit must be positioned close to the main water feed and power source to minimize cable and pipe runs. Another challenge is ensuring the wall material can support the weight of the unit, particularly in tiled areas where drilling requires specialist tools.
Maintenance for Longevity
Once installed, maintaining an electric shower is relatively simple but vital for longevity. Limescale buildup is the primary enemy of the heating element and should be addressed regularly. Using a descaling solution or a vinegar flush through the system every few months keeps the flow strong. Additionally, periodically checking the temperature and pressure settings ensures the unit operates efficiently throughout its lifespan.
