Inside a wired domestic consumer unit

What's included

  • Dedicated circuits sized for the shower's kilowatt rating
  • RCD protection as required for bathrooms
  • Correctly rated cable, isolator, and pull-cord
  • Upgrading a circuit when fitting a more powerful shower
  • Like-for-like replacement of an existing shower
  • Bathroom-zone-aware installation to BS 7671

Who it's for

Homeowners fitting a new or more powerful electric shower, anyone replacing a failed shower, people in a bathroom refit, and landlords upgrading a rental's shower safely.

How it works

  1. Tell us the shower's kilowatt rating and the bathroom layout
  2. We confirm the circuit, isolation, and protection needed
  3. Install or upgrade the circuit and connect the shower, coordinating with your plumber
  4. Test, certificate where needed, and demonstrate

Why an electric shower needs special attention

An electric shower heats water on demand, which makes it one of the highest-current appliances in the whole house, often drawing more than a cooker. Put that load on the wrong cable or an inadequate circuit and you get overheating, voltage drop, and a real fire risk. Add that it lives in a bathroom, the wettest room in the house, and it’s clear why shower circuits get particular care. We install and upgrade electric shower circuits across Kent.

Every shower install starts with the appliance’s kilowatt rating, because that single number drives the cable size, the protective device, and the isolation the circuit needs.

Sizing the circuit to the shower

Showers come in a range of power ratings, and a more powerful shower needs a bigger cable and protective device than a modest one. A common mistake is fitting a higher-output shower onto a circuit that was sized for a weaker one, which leaves the cable working beyond its rating.

We size the circuit to the shower you’re actually fitting, with the correctly rated cable, breaker, and a properly rated pull-cord isolator so the shower can be isolated safely from outside the wet zone.

Older fuse boxes due for replacement with a modern consumer unit
Older fuse boxes due for replacement with a modern consumer unit

RCD protection and bathroom zones

Bathrooms are divided into zones based on how close things are to water, and the rules about what can go where are strict for good reason. A shower circuit needs RCD protection, correct earthing and bonding, and accessories suited to their zone.

We install to BS 7671 with the protection and bonding the bathroom requires, so the result is safe to use and stands up to an inspection later.

Replacing or upgrading a shower

Replacing a like-for-like shower on a sound existing circuit is usually straightforward. The job grows when the new shower is more powerful than the old one, because the circuit may need upgrading to match, or when the existing wiring turns out to be undersized or in poor condition.

We check the existing circuit against the new shower before quoting, so you know up front whether it’s a simple swap or needs circuit work. We handle the electrical side and coordinate with your plumber on the water connections.

Twin sockets and trunking on a tested final circuit
Twin sockets and trunking on a tested final circuit

How we install a shower circuit

Tell us the shower’s kilowatt rating and the bathroom layout. We confirm the circuit, isolation, and protection needed, then install or upgrade the circuit and connect the shower. We test it, certificate the work where it’s notifiable, and demonstrate it before we leave.

Related work

For a fuse board upgrade to feed a new shower circuit, see consumer unit replacement. For a similar high-load heating circuit see immersion heater, and for wider work see domestic electrical. To book, get in touch with the shower’s rating.

Frequently asked questions

Why does an electric shower need its own circuit?

An electric shower heats water on demand and is one of the highest-current appliances in the home, often more than a cooker. It needs a dedicated circuit with correctly rated cable, breaker, and an isolator, sized to the shower's kilowatt rating.

Can I fit a more powerful shower than the one I have?

Often, but the circuit may need upgrading to match. A higher-output shower draws more current than a weaker one, so we check the existing cable and breaker against the new shower before quoting, and upgrade them if needed.

Do electric showers need RCD protection?

Yes. A shower circuit needs RCD protection, correct earthing and bonding, and accessories suited to the bathroom zones. We install to BS 7671 so it's safe to use and stands up to a later inspection.

Get a quote

Send a quick message and you'll get a same-day reply during working hours. Skip straight to phone or WhatsApp if you prefer.

EICR detail (helps with the quote)

Or skip the form: Office 01634 907123 Mobile 07598 216512 WhatsApp info@cjaelectrical.co.uk