Installing an Electric Shower: What You Need to Know
Electric showers are a convenient and efficient solution for delivering instant hot water in bathrooms. But many homeowners worry about the complexity and safety of installation. With electricity and plumbing involved, it's natural to feel cautious. This guide will help you understand the process step by step, ensuring safety and practicality every time.
Carefully following instructions is vital, not just for the shower's performance but also for your safety. If at any point you’re unsure, contacting a professional is always the best decision.
Understanding Electric Showers
Electric showers work independently of your central heating system, using electricity to heat water as it flows through the unit. This makes them an excellent choice for homes with inconsistent hot water supply or limited boiler capacity.
They are popular for their efficiency, only heating the water you use, and ease of installation in most bathrooms. With various designs available, from sleek modern styles to budget-friendly options, they can fit any space or aesthetic preference.
Tools and Materials Needed
Before beginning the installation, ensure you have the following tools and materials ready:
Tools:
Screwdrivers (Phillips and flathead)
Adjustable spanner
Drill with appropriate bits
Electrical tester or multimeter
Spirit level
Materials:
New electric shower unit
Screws and wall plugs (often included with the unit)
Pipe fittings or connectors
Silicone sealant (if required for finishing)
Having these on hand will save time and ensure a smooth installation process.
Safety Precautions
Safety should always come first when working with both electricity and water. Take these essential precautions:
Turn Off the Power: Locate the shower circuit breaker in your consumer unit and switch it off. Use an electrical tester to confirm the circuit is not live before proceeding.
Shut Off the Water Supply: Locate and turn off the main water supply, typically under the kitchen sink or in a utility room. Check taps to confirm the flow has stopped.
Test Everything: Even after turning off the power and water, double-check with your tools to ensure safety. It's better to over-check than risk injury.
If you're unsure about any step, stop immediately and call a certified electrician or plumber. Safety is non-negotiable.
Step 1: Power Off the Shower
Safety starts with turning off the electricity. Locate the circuit breaker that powers your existing shower in the consumer unit, typically labelled as "shower" or "bathroom circuit." Switch it off to isolate the power supply. Once done, confirm there’s no residual current by using an electrical tester or multimeter on the shower’s live wires.
Even if you're confident the breaker is off, always test for live wires before handling any electrical components. This ensures there’s no risk of electrocution, even if there’s a wiring fault in the circuit.
Step 2: Shut Off Water Supply
The water supply to the shower must be completely turned off before proceeding. Most showers connect to the main water system, so locate the main stopcock, usually found under the kitchen sink or in a utility area. Turn it clockwise to stop the flow.
After shutting off the supply, open a few taps in the house to release any water left in the pipes. This helps prevent accidental leaks when disconnecting the shower unit. If you can’t locate the stopcock or it’s hard to turn, it may be worth seeking assistance from a professional plumber.
Step 3: Remove the Old Shower
With the power and water safely off, you can start removing the old shower. Follow these steps:
Unscrew the Shower Unit: Locate the screws holding the shower casing in place. These are often found on the front or side of the unit. Use a screwdriver to carefully remove them and lift off the casing.
Disconnect the Wires: Using your electrical tester again, double-check that no live current remains. Unscrew the electrical connections, keeping track of which wire connects to each terminal for reference.
Disconnect the Water Supply: Loosen the water connection to the unit using an adjustable spanner. Be prepared for a small amount of residual water to escape.
Remove the Unit from the Wall: Locate the screws securing the unit to the wall. Once removed, gently pull the shower unit away. Be careful not to damage the wall or surrounding tiles.
Keep all screws and components in a safe place—they may come in handy during the installation of the new shower.
Step 4: Preparing for the New Shower
Preparation is key to a smooth installation. Start by positioning the new shower unit and identifying where adjustments may be needed:
Adjust Water Inlets: Many modern showers have flexible water inlets to accommodate existing pipe layouts. Align the inlet with your plumbing.
Mark Mounting Holes: Use a spirit level to ensure the shower unit is straight. Mark the new screw positions on the wall with a pencil. If the holes don’t align with the previous unit, you’ll need to drill new ones.
Check Wiring Compatibility: Ensure the shower’s electrical connections align with your existing wiring. If necessary, consult the manual for adjustments.
Test Fit: Temporarily mount the shower unit to ensure everything lines up correctly before securing it permanently.
By taking the time to prepare thoroughly, you’ll avoid common problems like leaks or misaligned fixtures during installation.
Step 5: Installing the New Shower
Now it’s time to secure the new shower unit and connect the water supply:
Mount the Unit: Align the shower unit with the holes you marked earlier. Use a drill to create any necessary holes and fix the unit securely to the wall with the screws provided. Ensure it’s level and flush against the surface.
Connect the Water Supply: Attach the water inlet to the shower unit using the appropriate fitting or connector. Tighten the joint with an adjustable spanner, ensuring it’s firm but not overtightened to avoid damage.
Check for Leaks: Turn the main water supply back on gradually and observe the connection point for any leaks. If you notice dripping, gently tighten the connection further or check the washer inside the fitting.
By completing these steps carefully, you ensure a secure fit and prevent potential water damage.
Step 6: Connecting the Wiring
Reattaching the electrical connections is a critical part of the process. Follow these steps:
Identify the Terminals: Open the shower’s connection box and locate the live (L), neutral (N), and earth (E) terminals.
Reconnect the Wires: Match the existing house wiring to the corresponding terminals in the shower. Tighten the screws on each terminal securely, ensuring no exposed copper wire is visible.
Follow Manufacturer’s Instructions: Always consult the installation guide provided with the shower to ensure proper wiring. Incorrect connections can cause malfunctions or pose safety risks.
Check UK Electrical Regulations: Ensure the wiring complies with the required standards, including the correct fuse rating and RCD (Residual Current Device) protection.
If you are not confident working with electrical systems, hire a qualified electrician to complete this step. Electrical safety is essential.
Step 7: Testing the Installation
Before declaring the job done, thoroughly test the shower to ensure everything works as expected:
Turn On the Power: Switch the shower circuit breaker back on and confirm that power is reaching the unit. Most modern showers have an indicator light to show they’re receiving electricity.
Run the Shower: Turn on the shower and let it run for a few minutes. Check for proper water flow and ensure the water heats up as it should.
Inspect for Leaks: Examine all connection points for water leaks while the shower is running. Tighten any fittings if necessary.
Follow Commissioning Steps: Some shower models require specific settings to be configured during first use. Refer to the manufacturer’s guide for these steps.
Testing ensures the shower functions correctly and safely before regular use.
Troubleshooting Common Issues
Sometimes, issues arise even after careful installation. Here’s how to address the most common problems:
Leaks Around the Water Connection: Ensure all fittings are tightened correctly and check for damaged washers. Replace if necessary.
Low Water Pressure: Verify that the main water supply is fully open and ensure there are no blockages in the inlet filter or pipe.
No Power to the Unit: Check the circuit breaker and ensure the wiring connections are secure and in the correct terminals. Use an electrical tester to confirm the presence of voltage.
Inconsistent Heating: Ensure the water pressure meets the unit’s requirements. If problems persist, the heating element or thermostat may need professional inspection.
If you’re unable to resolve an issue, seek help from a certified electrician or plumber. It’s always safer to get professional support than to risk further complications.
Why Call a Professional?
Installing an electric shower involves handling both electrical wiring and plumbing connections, which can pose significant risks if done incorrectly. In the UK, regulations require electrical work in bathrooms to comply with Part P of the Building Regulations, and only qualified electricians are authorised to certify these installations.
Hiring a professional ensures the job is completed safely and legally. They can:
Verify that your electrical system meets the required standards.
Install the necessary RCD (Residual Current Device) protection.
Ensure all connections are secure and free from faults.
If you’re not confident with either the plumbing or electrical aspects, bringing in a professional reduces the risk of injury, property damage, or regulatory issues. It’s a worthwhile investment for peace of mind and long-term safety.
FAQs About Electric Shower Fittings
Can I install an electric shower myself?
Yes, you can install an electric shower yourself if you’re confident with plumbing and electrical tasks. However, UK regulations require that any electrical work in a bathroom be inspected and certified by a qualified electrician. Failing to comply with these regulations can lead to safety risks and legal complications.
How to connect an electric shower to the mains?
An electric shower is connected to the mains via a dedicated circuit from the consumer unit. This circuit requires the correct cable size, often 10mm² for high-power units, and must be protected by an RCD. For safety and compliance, it’s recommended to have a qualified electrician handle this step.
What power supply do I need for an electric shower?
The power supply for an electric shower depends on its wattage. Most units require a dedicated circuit with a fuse rated between 40 and 50 amps. A higher-powered shower (9.5kW or above) typically needs a 10mm² cable to handle the electrical load safely.
Do you need a hot water supply for an electric shower?
No, electric showers don’t require a hot water supply. They heat water instantly as it flows through the unit, relying solely on a cold water mains connection. This makes them a practical choice for homes with limited or inconsistent hot water systems.
Are electric showers connected to mains?
Yes, electric showers are connected to the cold water mains supply. This ensures adequate pressure and flow for the shower to operate effectively. The electrical connection is also made directly to the consumer unit on its own circuit.
How much does it cost to install an electric shower in the UK?
The cost of installing an electric shower in the UK typically ranges from £200 to £500. The final price depends on factors such as the complexity of the installation, whether new wiring is needed, and the labour charges of the professional carrying out the work. Hiring a certified installer ensures safety and regulatory compliance.
Facts To Consider
Bathrooms are high-risk areas due to the combination of water and electricity, increasing the severity of potential electric shocks. (Source: Electrical Safety First)
A significant percentage of household accidents occur due to improper handling of electrical and plumbing systems, emphasising the importance of hiring a professional service for installations. (Source: Electrical Safety First)
Contact Us for More Information or Advice
Need help with installing an electric shower or have questions about your electrical setup? Our London electrician is here to help. Based in London, we proudly serve Chelsea, Fulham, Putney, Wandsworth, Westminster and Battersea.
You can reach us at:
Address: 445 Sulivan Court, Peterborough Road, London SW6 3BX
Email: info@tnssolutions.co.uk
Phone: 020 3715 2919
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