Type of Water Closet — Every WC Type Explained, and What a Water Closet Is
A water closet is the toilet itself — the ceramic pan that flushes waste into the drain. The types differ in three ways: how the pan and cistern are joined and mounted, how the pan flushes, and which way the waste leaves. Those three choices are what a WC specification actually is.
Types of water closet
| Type | How it mounts | Best for |
|---|---|---|
| One-piece | Floor, tank moulded into the pan | Easiest to clean, premium residential |
| Two-piece | Floor, separate cistern bolted on | Lowest cost, easiest to ship and replace |
| Wall-hung | Bracket into the wall, concealed cistern | Floor clear beneath, small and modern bathrooms |
| Floor-mounted EWC | Bolted to the floor, exposed cistern | The volume seller across most export markets |
| Back-to-wall | Floor, cistern hidden in furniture | Concealed plumbing without a wall frame |
| Squat pan (Indian WC) | Set into the floor | Traditional use, public and budget installations |
| Anglo-Indian | Floor, usable seated or squatting | Shared bathrooms where users differ |
Water closet types by flush and trap
Two WCs that look identical can be different types underneath. These are the choices that decide whether a pan fits the drain and flushes properly.
| Choice | Types | What it decides |
|---|---|---|
| Trap / outlet | S-trap (floor) or P-trap (wall) | Whether the pan connects to the existing drain |
| Flushing action | Washdown or siphonic | Noise, water surface and how clean the bowl stays |
| Rim | Standard rim or rimless | Rimless has no hidden ledge to clean under |
| Flush source | Cistern, concealed cistern or flush valve | What water supply the WC needs |
| Flush volume | Single or dual (3/6 litres) | Water use per flush |
| Seat height | Standard or comfort height | Ease of use for elderly users |
Water closet, lavatory, bathroom, restroom
A water closet — WC — is strictly the toilet fixture and, by extension, the small room containing it. The name comes from the nineteenth century, when a flushing pan was first installed in a closet-sized room of its own, and it stuck in the trade even as the domestic language moved on.
A lavatory, confusingly, originally meant the wash basin, not the toilet. In American usage it drifted to mean the whole room; in plumbing specifications it still often means the basin. If a drawing lists "1 WC, 1 lavatory" it is almost certainly specifying one toilet and one wash basin, not two toilets.
Bathroom means a room with a bath in it, which is why a room with only a toilet and basin is properly a cloakroom or powder room rather than a bathroom. Restroom and washroom are the polite public-building terms. On a purchase order, none of this ambiguity is acceptable — so the trade uses WC, and means the pan.
What to confirm before ordering a water closet
- Trap type — S-trap discharges through the floor, P-trap through the wall. This is not interchangeable — get it wrong and the pan will not connect.
- Rough-in distance — The distance from the finished wall to the centre of the waste outlet. Standard is 300 mm or 400 mm on S-trap; confirm against the existing drainage.
- Flush type — Flush tank or flush valve, single or dual. Dual flush needs adequate supply pressure to clear the pan on the short flush.
- Seat fixing — Top-fix or bottom-fix. Wall-hung and back-to-wall pans usually need top-fix because there is no access underneath.
- Cistern included or separate — Two-piece closets are often quoted pan-only. Check whether the price includes the cistern and the fittings.
- Water spot and trap seal — A larger water surface keeps the pan cleaner; a deeper trap seal is better at blocking odour where the drain run is long.
Frequently asked questions
What is a water closet?
The toilet fixture itself — the ceramic pan that flushes waste into the drainage system — and by extension the small room it sits in. WC is the abbreviation used on drawings, plumbing schedules and sanitary ware price lists worldwide.
What is the difference between a water closet and a lavatory?
In plumbing terms a water closet is the toilet and a lavatory is the wash basin. In everyday American usage lavatory drifted to mean the whole room, which causes regular confusion — on a specification, assume lavatory means the basin unless the drawing says otherwise.
What are the types of water closets?
One-piece, two-piece, wall-hung, floor-mounted EWC, back-to-wall, squat pan and Anglo-Indian. They differ in how the cistern is joined to the pan and how the unit mounts, which in turn decides cleaning, cost and how much plumbing has to be hidden.
Which type of water closet is best for a home?
A one-piece or wall-hung WC for the easiest cleaning, a two-piece for the lowest cost and simplest repairs. Whichever you choose, the trap type — S-trap or P-trap — must match the drain already in the bathroom.
What is the difference between washdown and siphonic water closets?
A washdown WC pushes waste out with the force of the flush water; it is simple and reliable on low water volumes. A siphonic WC creates suction in the trapway, which is quieter and leaves a larger water surface that keeps the bowl cleaner.
Is a water closet the same as a toilet?
Yes. Water closet is the formal and trade term; toilet is the everyday one. Commode is used the same way across South Asia, though in American English a commode can also mean a piece of furniture or a bedside chair.
What are water closets?
A water closet is the technical name for a flushing toilet — the ceramic pan, its trap and its flushing arrangement, considered as one fitting. In specifications and shipping documents it is almost always abbreviated to WC, and the term covers both one-piece and two-piece pans.
Request water closet specifications
Tell us the trap type, rough-in and flush system your market uses and we will send the matching models with container pricing.
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