Close Coupled Toilets

Close coupled toilets, explained simply

A close coupled toilet is a two-piece suite where the cistern bolts straight onto the back of the pan. No gap, no exposed pipe between them. It's the most common toilet style in Australian homes because it suits standard floor wastes, fits tight ensuites, and installs without an in-wall frame.

Replacing an old suite or speccing a reno around existing plumbing? This is usually the shape that drops in cleanest. We stock Caroma, Fienza, Abey, Decina and a few others, with rimless pans, soft-close seats and 4-star WELS as standard across most models.

Before you scroll the products, three things decide whether a suite will actually fit your bathroom: trap type, set-out measurement, and WELS rating. Get those right on paper and the install is straightforward. Get them wrong and the suite goes back. Still weighing up toilet styles? Have a look at the full toilet range first.

What to check before you order

Four decisions cause most wrong orders. Work through them in this order and you'll shortlist the right suite quickly.

Trap type (S-trap or P-trap). S-trap means the waste pipe drops through the floor. P-trap means it exits horizontally through the wall. Look at your existing suite, or ask your plumber, before you order.

Set-out measurement. This is the distance from the finished wall to the centre of the floor waste (S-trap), or from the finished floor to the centre of the wall outlet (P-trap). Measure from finished surfaces, not framing.

WELS star rating. The Australian Government WELS scheme rates 4-star toilets at ≤4.7L full flush, ≤3.2L half flush and ≤3.5L average. 6-star toilets sit at ≤2.5L average. Most close coupled suites are 4-star at 4.5/3L dual flush.

Cistern style and pan. Concealed cisterns hide the internals behind a smooth shroud for easier cleaning. Exposed cisterns are simpler to service. Rimless pans skip the under-rim trap where build-up collects.

Want the flush rear profile without going in-wall? The back-to-wall toilet collection is the next step up.

S-trap vs P-trap set-out at a glance

Measure from finished wall and finished floor. These ranges are pulled from current Caroma, Argent and Ideal Standard technical sheets.

If your measurement falls outside a suite's adjustable range, an offset connector usually solves it. Worth confirming with us before you order.

Installation and Australian compliance

A licensed plumber must install any toilet suite in every Australian state and territory. That's not optional. DIY installation will void the warranty and your home insurance position.

What your plumber will check

Before connecting, they'll confirm the WaterMark certification on the suite (required under AS 1172 for all plumbing fixtures), the WELS registration (tested at an accredited lab under AS/NZS 6400:2016), the rough-in measurement against the suite's adjustable range, and the cold water inlet position, bottom or back entry depending on the cistern.

Keeping an existing pan and only replacing the cistern? The toilet cisterns collection is where to look. Starting fresh? Confirm trap type and set-out before checkout.

Close coupled toilet questions answered

What's the difference between S-trap and P-trap?
S-trap waste pipes drop through the floor. P-trap waste pipes exit horizontally through the wall. The pan and cistern look identical from the front. The difference is purely where the waste outlet sits. You can't swap one for the other without re-plumbing, so match the suite to your existing setup.

How do I measure rough-in or set-out before ordering?
For S-trap, measure from the finished wall to the centre of the floor waste outlet. For P-trap, measure from the finished floor to the centre of the wall outlet. Always measure from finished surfaces, not framing or rough render. A Caroma Seido S-trap, for example, takes 80–180mm with the supplied Uniconnector, or up to 240mm with an offset.

What does WELS 4-star vs 6-star actually save?
WELS 4-star toilets average 3.5L per flush (4.5L full, 3L half). WELS 6-star sits at 2.5L average. Over a household of four flushing roughly 20 times a day, that's around 7,300L a year difference. Worth it if you're on tank water or chasing a BASIX rating.

Close coupled vs back-to-wall vs wall-hung, which suits a reno?
Close coupled is the easiest swap if you've got existing plumbing. Back-to-wall hides the pipework behind the pan for a cleaner look without an in-wall cistern. Wall-hung toilets need an in-wall frame and concealed cistern, best decided before the wall closes up.

Are rimless pans worth it?
Yes, if you don't enjoy scrubbing under the rim. Rimless pans use a direct flush channel rather than a hidden under-rim, so there's nowhere for build-up to hide. Most current Caroma, Fienza and GalvinAssist close coupled suites are rimless as standard.

If your measurements don't match anything on the page, contact us with your rough-in figures and we'll point you at suites that fit.

Buying close coupled toilets from us

We're an authorised stockist for Caroma, Fienza, Abey and Geberit. Every suite ships with the full manufacturer warranty and genuine parts backing. Delivery is Australia-wide.

What you get from us that you won't get from a marketplace is a team that knows trap types and set-outs, not just SKUs. Send us a photo of your existing setup and the wall-to-outlet measurement, and we'll tell you which suites fit and which don't. That's the work, and it saves the cost of returning a wrong suite. The full Caroma range is here if you're brand-loyal.

Related toilet collections

If close coupled isn't quite right, the back-to-wall toilets collection gives you the flush rear profile without an in-wall frame. For a fully concealed look, wall-hung toilets paired with Geberit in-wall cistern systems are the cleanest option. Replacing just the seat or the cistern? See toilet seats and toilet cisterns.