Electric Shower Installation London

What power rating electric shower should I get for my London home?

Electric shower power rating directly determines water flow rate — higher wattage heats mains cold water faster, giving a stronger spray at any given temperature. In London, Thames Water typically delivers mains pressure of 2–4 bar (Ofwat minimum is 1 bar), which is adequate for all electric shower models. Recommended ratings by household size: (1) 7.5kW: adequate for a single-occupancy flat or occasional use. Flow rate approximately 4.5–5 litres/minute at a comfortable temperature. (2) 8.5kW: suitable for couples in a London flat. More satisfying spray, better performance in winter when incoming cold water temperature drops to 8–10°C. (3) 9.5kW: good for family bathrooms. Noticeably stronger performance. Requires 10.0mm² T&E cable on a 40A MCB. (4) 10.8kW: the best electric shower experience — approaches a power shower in flow rate. Requires 10.0mm² T&E (some engineers specify 10.5mm²) on a 45A MCB. Consumer unit must have capacity for a 45A circuit. In London Victorian terraces with older 60A or 80A total fuse boards, upgrading to a modern 100A consumer unit may be necessary before fitting a 10.8kW shower.

Does an electric shower installation in London need Building Regulations approval?

Yes — electric shower installation is a notifiable electrical work under Part P of the Building Regulations because it involves a new circuit in a bathroom (a special location under BS 7671 18th Edition Wiring Regulations). This means: (1) The work must be carried out by a Part P registered electrician (or by a plumber working alongside a Part P electrician). We work with Part P registered electricians and include the Building Regulations notification in our installation price — you receive an electrical installation certificate and the local authority is notified automatically by us. (2) Alternatively, if you hire a non-registered person, they can apply to your London Borough Council for a Buildings Inspector to check the work — but this involves inspection fees and delays. (3) The certificate is important for property sale purposes — solicitors routinely ask for electrical certificates for works carried out in bathrooms when properties are sold. (4) NICEIC and NAPIT are the main Part P registration schemes in the UK. Our electrical partners hold NICEIC registration.

What cable and MCB size does an electric shower need in a London property?

Electric showers require a dedicated circuit from the consumer unit (not a spur from an existing ring main). The cable size and MCB rating depend on the shower power: 7.5kW shower: 6.0mm² twin and earth cable, 32A MCB, 30mA RCD protection. Cable run typically 10–15 metres from consumer unit to shower in a London terrace. 8.5kW shower: 10.0mm² twin and earth cable, 40A MCB. The jump from 6mm² to 10mm² cable is significant — 10mm² T&E is noticeably thicker and harder to route through walls. In London Victorian solid brick construction, chasing walls for 10mm² cable requires a SDS drill and is included in our price. 9.5kW shower: 10.0mm² cable, 40A MCB. 10.8kW shower: 10.0mm² cable (some specifications call for 10.5mm²), 45A MCB. Ensure your consumer unit has a spare 45A MCB slot. RCD protection: all new circuits in bathrooms must be protected by a 30mA RCD under the 18th Edition Wiring Regulations (Amendment 2, effective February 2022 in the UK). Modern consumer units typically have RCBO protection on each circuit — the safest arrangement. Older split-load consumer units may need upgrading to accommodate RCD protection for a high-power shower circuit.

Which electric shower brands are best for London homes?

Best electric shower brands for London installations, based on our experience fitting hundreds of units across all 33 London boroughs: (1) Mira Sport Max (9.0kW / 10.8kW) — the most popular premium electric shower in the UK. Thermostatic option available (Mira Sport Max Thermostatic) — maintains water temperature when someone flushes a toilet or uses cold water elsewhere. Particularly useful in London HMOs and flats with shared plumbing. From around £200 supply-only. (2) Triton Enrich / Astra (7.5kW–9.5kW) — Triton is the UK's largest shower manufacturer. The Enrich is a solid mid-range unit with a good 5-year guarantee. Popular in London rental properties for reliability and low maintenance. From around £70 supply-only. (3) Aqualisa Quartz Electric — premium brand, excellent build quality. The Quartz Electric has a remote digital controller for temperature and flow — popular in London design-focused bathrooms. From around £280 supply-only. (4) Redring Expel (7.5kW–9.5kW) — commercial and budget choice. Widely used in London landlord properties. Reliable and easy to service. From around £60 supply-only. (5) Bristan Bliss — well-regarded for compact design. Good for London shower enclosures where space above the shower head is limited.

Can I install an electric shower in a London flat?

Yes — electric showers are well-suited to London flats because they heat mains cold water on-demand and do not depend on a hot water cylinder or boiler. This makes them ideal for London flats with a combi boiler (where the boiler may already be providing hot water to several other outlets) and for flats where the boiler pressure is insufficient for a satisfying shower from the hot supply alone. Flat-specific considerations: (1) Freeholder consent: in most London leasehold flats, chasing cables into walls or running cables through communal areas requires written consent from the freeholder or management company. Minor surface-mounted conduit (within your flat, not communal) typically does not require consent. (2) Consumer unit location: in London flats, the consumer unit is often in a hallway or kitchen. Running a 10mm² cable from the hall consumer unit to a bathroom shower can require careful routing to avoid communal areas. (3) Water pressure: Thames Water's pressure varies significantly across London (Highgate and Hampstead receive lower pressure due to elevation; Battersea and Bermondsey receive higher pressure). Electric showers from 7.5kW+ work well at London's typical 2–4 bar mains pressure. (4) Below-ground flats: ground floor and basement flats in London Victorian conversions often have adequate mains pressure — check by filling a 1-litre container at the cold tap; 1 litre in under 10 seconds indicates adequate pressure.

What is the difference between an electric shower and a power shower for London homes?

Electric showers and power showers work on fundamentally different principles and suit different London plumbing setups: Electric shower: heats mains cold water instantly using an internal electric heating element — no hot water cylinder needed. Works with combi boilers, gravity-fed systems, or mains-only supplies. The mains water pressure drives the flow (no pump). Power output (7.5kW–10.8kW) determines the flow rate you can achieve at a comfortable temperature. Best for: London combi boiler homes; flats without hot water cylinders; replacing an existing electric shower. Power shower: uses a pump to boost the flow rate of pre-mixed hot and cold water drawn from a gravity-fed hot water cylinder. Requires a vented (gravity-fed) hot water cylinder with separate cold water storage tank — typically found in London Victorian terraces with a boiler and airing cupboard setup. Cannot be used with a combi boiler (no stored hot water) or mains-pressure unvented cylinders. Delivers a very high flow rate (12–15 litres/minute) because the pump boosts whatever the gravity system provides. If your London home has a combi boiler, an electric shower is the correct choice. If it has a vented cylinder and low gravity pressure, a power shower (or a pump-assisted mixer shower) is appropriate.