Shower Toilets Explained: How They Work, What to Look For and What They Cost in the UK

What is a shower toilet?

A shower toilet combines a conventional WC with the washing function of a bidet. When you have finished, a slim nozzle extends from beneath the seat and cleans you with a controlled stream of warm water — no moving to a separate fixture, no reaching for a tap. You set the temperature, pressure and spray position from a remote control or side panel, and the nozzle rinses itself and retracts when you are done.

The same product goes by many names. Shower toilet is the term European manufacturers prefer; Japanese toilet is what most people search for; smart toilet, bidet toilet and wash-and-dry toilet all describe the same idea. WASHLET® is TOTO’s trademark for the warm-water bidet seat it introduced in Japan in 1980 — the product that created the category.

If you are still deciding between a shower toilet and a traditional ceramic bidet, our bidet vs shower toilet comparison covers that choice in detail. This guide picks up from there: how to choose the right shower toilet for your bathroom.

How does a shower toilet work?

A well-specified shower toilet runs a short, largely automatic sequence around every visit. On a fully featured model, it looks like this:

1. You approachA presence sensor wakes the toilet and, on automatic models, lifts the lid.
2. The bowl is pre-mistedA fine layer of water is sprayed onto the ceramic so that waste is less likely to cling. TOTO calls this PREMIST.
3. You sit downThe seat is already warm, and the deodoriser begins drawing air from the bowl through an activated-carbon filter.
4. You washPress rear or front wash. The nozzle rinses itself, extends at a controlled angle and delivers water at your chosen temperature. You can move the spray, adjust the pressure or add an oscillating or pulsating pattern while it runs.
5. You dryA warm-air dryer reduces — and for some people replaces — toilet paper.
6. It flushesOn automatic-flush systems the toilet flushes as you stand, choosing a short or full flush according to how long you were seated. Otherwise you use the flush plate as normal.
7. It cleans itselfThe nozzle is rinsed again and retracts behind its shield. On models such as the TOTO WASHLET RW and NEOREST, the nozzle and bowl are then misted with electrolysed water (EWATER+) to keep them cleaner between uses.

Every wash uses fresh water taken from your supply pipe — never water from the cistern or the bowl.

Which shower toilet features matter most?

Shower toilets vary far more in quality than their specification sheets suggest: two models can both list ‘warm water wash’ and deliver completely different experiences. These are the features to judge them on, in order of how much you will notice them every day.

Warm water: instantaneous heater or tank?

This is the single most important specification, and the easiest to overlook. Tank-heated models keep a small reservoir of water warm. Once it runs out — during a longer wash, or when two people use the toilet one after another — the water turns cold, and the tank then needs time to reheat. It also keeps water warm around the clock, whether you use it or not.

Instantaneous (continuous-flow) heaters warm the water as it passes through, so the temperature stays constant for as long as you wash, and the heater draws power only while it is working. Every WASHLET in TOTO’s European range uses one. When comparing other brands, look for ‘instantaneous’, ‘continuous-flow’ or ‘tankless’ heating in the specification.

A nozzle that stays genuinely clean

The nozzle deserves closer scrutiny than any other part of a shower toilet. A good one rinses itself with fresh water before and after every wash, retracts behind a protective shield while the toilet is in use, extends at an angle that keeps it clear of the stream, and is made from a material that resists residue — TOTO uses its own CLEAN RESIN. Premium models add a sanitising step: TOTO’s EWATER+ mists the nozzle with electrolysed water, while some other brands use UV light. A nozzle-clean button, which extends the nozzle so you can wipe it by hand, is a small but telling sign of a well-thought-out design.

Spray settings you will actually use

Every shower toilet offers a rear wash, and most add a front (lady) wash with a wider, gentler spray. Better models include a soft rear setting for sensitive skin, plus oscillating (the nozzle moves back and forth for broader coverage) and pulsating (the pressure alternates between firm and soft) modes. More important than the number of modes is fine control: pressure, temperature and nozzle position should all be adjustable, including while the wash is running.

A rimless bowl, a strong flush and a smooth glaze

The ceramic does half the hygiene work. A rimless bowl removes the hidden channel under the rim where bacteria and limescale collect — TOTO’s rimless pans and VitrA Rim-Ex are examples. A swirling flush, such as TOTO Tornado Flush or GROHE Triple Vortex, scours the whole bowl with less water. And a dense, ultra-smooth glaze, such as TOTO CEFIONTECT, gives residue and limescale little to grip. Together they mean less scrubbing and milder cleaning products. TOTO adds two further steps: PREMIST wets the bowl before use, and EWATER+ mists it with electrolysed water afterwards.

Heated seat with energy-saving modes

The heated seat is the feature most owners say they would miss first — particularly through a British winter. It is also the largest continuous use of electricity, so look for energy-saving settings: timers that switch heating off overnight and, on some models, learning modes that lower the temperature automatically at times the toilet is rarely used. TOTO WASHLET models include energy-saving settings as standard.

Automatic deodoriser

A deodoriser starts when you sit down, draws air from the bowl through an activated-carbon filter and returns it to the room odour-free — invaluable in family bathrooms, en-suites and cloakrooms. It is included on most WASHLET models (the entry-level RG Lite is the exception), and replacement TOTO carbon filters are an inexpensive, readily available spare.

Warm-air dryer

A dryer cuts toilet-paper use and matters most to anyone who finds reaching or twisting difficult. Adjustable temperature is standard; what separates an effective dryer from a token one is the volume and angle of the airflow, not heat alone. Be realistic, though: even good dryers take a minute or two, and many owners settle into a short dry followed by a single sheet of paper.

Automatic lid, automatic flush and user profiles

Sensor-operated lids and automatic flushing make a shower toilet almost entirely touch-free — a real advantage in guest cloakrooms and for anyone with limited grip. TOTO’s automatic flush selects a short or full flush depending on how long you were seated, but it requires a compatible TOTO frame fitted with a flush motor, such as the TOTO WC element WH183ET, so it must be specified before the wall is closed.

User profiles store each person’s preferred temperature, pressure and nozzle position under a single button, which saves daily readjustment in shared households.

What does a UK installation involve?

An electronic shower toilet needs three things: a cold mains water feed, a 230 V electrical supply beside the WC, and a pan or frame it is designed to fit. A non-electric bidet seat needs only the water.

Water supply

Most electronic seats and all-in-one units take a cold feed from the existing supply through an isolation valve and T-piece, then heat the water themselves — no hot-water connection is needed. Thermostatic non-electric seats such as the Maro D’Italia FP204 are the exception: they connect to both hot and cold. Check the model’s minimum water pressure, too. If your cistern is fed from a loft tank rather than the mains, the pressure may be too low for a satisfying wash.

The washing function must also be protected against backflow into the drinking-water supply, as required by the Water Supply (Water Fittings) Regulations 1999. Reputable shower toilets build this protection in; look for WRAS approval or equivalent certification, and ask us to confirm it for any model.

Electrical supply

An electronic model needs a permanent 230 V supply within reach of its cable. In UK bathrooms this is normally an RCD-protected fused connection unit (a fused spur), positioned in line with the BS 7671 bathroom zone rules. Adding a new circuit, or electrical work close to a bath or shower, can be notifiable under Part P of the Building Regulations in England and Wales, so use a registered electrician.

For wall-hung shower toilets, the supply should run through the frame so that the cable is hidden behind the pan. If you are renovating, have your electrician run it before the wall is boarded — even if you are not buying the shower toilet yet. It is by far the cheapest moment to do it.

Pans, frames and compatibility

A bidet seat must match the pan’s shape, length and fixing-hole positions, so a ‘universal’ fit is never guaranteed. The simplest route is a matched combination — seat and pan designed together — from our toilet and bidet combinations, or a matching toilet for the seat you have chosen. For wall-hung installations, check the frame height, pan fixing centres and waste connection; for TOTO automatic flush, the frame itself must be specified correctly from the outset (see our flush, frame and supply range).

If opening the wall is not practical, a back-to-wall floorstanding suite such as the TOTO WASHLET RW back-to-wall set gives you the full WASHLET experience without a concealed frame.

Hard water

Much of England — including London, the South East and East Anglia — has hard water, and limescale is the main long-term threat to any shower toilet’s heater and valves. In hard-water areas, fit an inline scale filter such as the Waco bidet water-softening filter and run the descaling programme whenever the toilet prompts you. You will find more options in our filters range.

How do you clean and look after a shower toilet?

Day to day, a shower toilet is cleaned much like any other toilet — with a few sensible differences.

• Seat and lid: wipe with a soft, damp cloth and a mild, neutral detergent. Avoid abrasive creams, scouring pads and bleach-based sprays on the plastic parts.
• Ceramic bowl: clean as normal. Rimless bowls and premium glazes mean milder products are usually enough.
• Nozzle: use the nozzle-clean function to extend it, then wipe gently. The automatic rinse handles the rest.
• Descaling: follow the toilet’s reminder or the manual. TOTO WASHLET models accept a standard citric-acid descaler rather than an expensive branded product.
• Filters: replace the deodoriser’s carbon filter and any inline water filter at the intervals in your manual.

Before you commit to any brand, check that spare parts — remote controls, nozzles, filters, seats and lids — are available in the UK. A shower toilet should serve you for many years, so long-term parts support matters as much as launch features. We stock TOTO spare parts and consumables, and our warranty and guarantees page explains the cover on every product we sell.

If a shower toilet ever develops a fault, it still works as an ordinary toilet: you lose the washing functions, not the WC.

Can a shower toilet help with ageing, mobility or sensitive skin?

For many households this is the strongest reason to buy. Washing and drying at the press of a button removes the reaching and twisting that toilet paper demands, which can restore independence and privacy for older people, anyone recovering from surgery or injury, and people with limited hand function or reach. A remote control with large, clearly labelled buttons, an automatic lid and flush, and an effective dryer make the biggest difference. Grab rails, a comfort-height pan or a height-adjustable frame can be combined with any of the options in this guide.

Gentle warm-water cleansing is also more comfortable than paper for many people with sensitive skin. A shower toilet supports everyday hygiene, but it is not a medical treatment — if you have a specific condition, ask your GP or occupational therapist what will help most.

How much does a shower toilet cost in the UK?

In the UK, a shower toilet costs from around £100 for a non-electric bidet seat to £5,500 or more for a complete system with automatic flush. Most buyers choosing an electronic model spend between £1,000 and £3,500.

Indicative ranges across our UK range, September 2026, including VAT. Prices change with promotions — each product page shows today’s price.

Beyond the product itself, budget for installation: a plumber for the water connection and, where no suitable supply exists, an electrician. Running costs are modest — most of the electricity goes on seat heating, which energy-saving modes keep in check — and most households buy far less toilet paper. Delivery is free on qualifying orders; see our free shipping terms.

Why is TOTO WASHLET the benchmark?

TOTO launched the WASHLET in Japan in 1980, and it remains the reference point for the whole category. Around four in five Japanese households now have a warm-water bidet seat, according to the Japanese government’s consumer surveys, and in December 2025 TOTO announced that cumulative WASHLET shipments had passed 70 million units worldwide.

TOTO arrived in Europe in 2009, bringing its rimless bowl and Tornado Flush with it, and prompted many European manufacturers to develop shower toilets of their own. That competition is good news for buyers: GROHE, Geberit, VitrA, Roca, Duravit and LAUFEN now make excellent alternatives, each with its own strengths, and we stock them side by side so you can compare fairly. You can see TOTO’s latest designs at its Clerkenwell showroom in London, and read how the WASHLET became part of Japanese public life in our Tokyo Toilet Project feature.

Before you order: five checks

1. Choose your typeDecide whether you are keeping your existing pan (bidet seat) or replacing it (all-in-one or complete system).
2. Measure and photograph your toiletNote the distance between the seat-fixing holes, the length from the holes to the front of the bowl, and the space behind.
3. Confirm the water supplyYou need a cold mains feed with an isolation valve near the WC — plus hot water for thermostatic non-electric seats.
4. Arrange the powerBook an electrician for an RCD-protected fused spur beside the WC, or behind the frame for a wall-hung installation.
5. Check the long termAllow for hard-water protection, UK spare parts and warranty — then send us your details for a free compatibility check before you order.