In-Wall Concealed Cistern Toilet | Rimless | Floor Mount

An in-wall concealed cistern toilet system — the premium installation format where the cistern hides inside the wall cavity behind the toilet pan, leaving only the rimless ceramic pan visible from the bathroom side. Flush operation is via chrome push buttons mounted on the wall face above the pan. The cleanest, most contemporary toilet installation available.

What 'In-Wall Concealed' Means and Why It Matters

Standard toilets have a visible cistern sitting on top of the pan, holding the flush water. An in-wall concealed system moves the cistern inside the stud wall behind the toilet, with only the flush face buttons protruding through the tile face.

The difference is significant:

• Visual: the bathroom looks substantially cleaner without the cistern occupying wall space behind the toilet
• Space: smaller projection from the wall, more usable floor space in tight bathrooms
• Cleaning: nothing behind the pan to wipe around — the wall is flat tile
• Hygiene: no exposed cistern surfaces to accumulate dust or grime

The trade-off is installation complexity — the wall cavity needs to be framed during construction or opened up during renovation to fit the cistern. The installation is a specialist plumber's job, not a DIY swap.

What's Included

• Concealed cistern for in-wall mounting
• Rimless floor-mounted ceramic pan in U-shape with siphonic jet flushing
• UF soft-close seat
• R&T fittings for the cistern internals
• Chrome push-button flush face (dual flush — full and half)
• Connector pipe between cistern and pan

Siphonic Jet Flush

Siphonic jet flushing uses a jet of water at the base of the trap to initiate siphon action — the bowl empties through suction rather than direct push-down pressure. Two practical effects:

• Significantly quieter flush than wash-down designs — useful in compact bathrooms next to bedrooms or living areas
• Less splashing during use

Siphonic systems use slightly more water per flush than wash-down for the same waste removal — the 3–6 L dual flush range on this unit is configured to deliver effective siphon action while staying within WELS-rated water efficiency.

WaterMark Licence WMK26775

This SKU carries WaterMark Certificate WMK26775 — explicit licence number from the supplier documentation, confirmed in source data. Your licensed plumber can install this on a mains supply line and issue a certificate of compliance for the installation.

Compliance

• WaterMark certified to AS/NZS 6400 — Licence number WMK26775
• CE certified for European market compliance (relevant for some plumbing fittings imports)
• WELS rated

Dimensions

• Pan: 560 × 360 × 400 mm
• Drainage: P-trap (wall exit) — confirm rough-in dimensions match your wall plumbing
• Installation: floor-mounted pan, in-wall concealed cistern
• Weight: 31–40 kg complete system
• Brand: Enviro Aqua
• Model: 3380