Dimension

Instruction

Kohler Melius Rimless Back to Wall Toilet with Slim Seat 670x360x840mm - Gloss White

Name: Kohler Melius Rimless Back to Wall Toilet with Slim Seat 670x360x840mm - Gloss White
Brand: Kohler
SKU: KH-42329A-0
Price: 678.00 AUD
Availability: InStock

SKU: KH-42329A-0

Product Overview

Feature	Essential	Advantage	Ultimate
Extended Warranty	+5 Years	+10 Years	+15 Years
Transit Damage Coverage	up to $500	up to $3,000	up to $10,000
On-Site Support	--	--	3 Years
Price	$15	$10	$5

Specifications

Features

Kohler Melius™ Rimless Back-To-Wall Toilet Suite

Upgrade your bathroom with the minimalist elegance and exceptional hygiene of the Kohler Melius™ Rimless back to wall toilet suite. Engineered for the modern Australian home, it integrates advanced rimless flushing performance, a seamless straight-sided skirted pan, versatile multi-directional water inlet configurations, and a streamlined ultra-slim UF seat.

Rimless Hygiene Bowl Straight-Sided Skirt Slim UF Seat WELS 4-Star Certified Universal S & P Trap

Kohler Melius Rimless Back-To-Wall Toilet Suite Main View

Feature Highlights

Hygiene & Performance

Advanced Rimless Bowl for Effortless Cleaning

Engineered without traditional internal box rims, the Melius pan channels water powerfully around the entire inner contour, leaving zero blind spots or hidden ledges for dirt and bacteria to accumulate.

This open-rim architecture ensures complete bowl rinse with every flush while dramatically reducing the time, effort, and harsh chemicals needed for routine cleaning.

Kohler Melius Rimless Hygiene Bowl Technology Detail

Modern Aesthetics

Seamless Straight-Sided Back-To-Wall Skirt

Featuring a clean, contemporary straight-sided profile, the ceramic pan installs completely flush against your bathroom wall to conceal trap connections.

The uninterrupted, flat exterior side panels eliminate awkward dust-trapping nooks and side pockets, allowing you to wipe down the exterior surface in one swift motion.

Straight-Sided Fully Skirted Back-To-Wall Pan Design

Plumbing Versatility

Multi-Directional Flexible Water Inlet Configuration

Engineered to suit a wide variety of rough-in conditions, the Melius suite accommodates both top-left rear concealed water entry and low-level left or right side pan connections.

This flexible configuration allows for hassle-free retrofitting into existing bathroom supply points without requiring invasive and expensive plumbing alterations.

Flexible Multi-Directional Water Inlet Entry Options

Ergonomics & Comfort

Ultra-Slim Urea-Formaldehyde Seat

Complete with an ultra-thin Slim Seat profile, the suite delivers a lightweight visual transition that complements the vitreous china bowl's architectural geometry.

Molded from dense urea-formaldehyde (UF) resin, it offers superior scratch, chemical, and discoloration resistance.

Ultra Slim Urea-Formaldehyde Toilet Seat Detail

📐 Dimensional & Rough-In Advisory: A measurement deviation of ±5mm is regarded as a common and acceptable variation in ceramic products. Plumbing requirements vary by home — confirm set-out and trap type before purchase.
⚙️ Water Supply Configuration: Accommodates top-left rear water entry or left/right bottom pan entry. Please verify existing stop-valve locations with your licensed plumber prior to installation.

Product Information

MODEL
Product Name	Melius™ Rimless Back-To-Wall Toilet Suite
Main Product Code (SKU)	KH-42329A-0
Brand	KOHLER
MATERIAL & FINISH
Pan & Cistern Material	Premium Vitreous China Ceramic
Toilet Seat Material	UF Heavy-Duty Thermoset Plastic
Colour / Finish	Gloss White
SPECIFICATION
Product Type	Back-To-Wall Toilet Suite
Installation Type	Floor Mounted, Back-to-Wall Skirted
Flushing Technology	Rimless Flushing System
Skirt Design	Straight-Sided Skirt
Seat Profile	Slim Profile Toilet Seat
TECHNICAL INFORMATION
S-Trap Set-Out Range	90 – 120 mm
P-Trap Height	185 mm
Water Inlet Positions	Top-left rear entry cistern connection, or right/left pan side bottom entry
Flush Volume & Ratings	Dual Flush 4.5/3 Litres (Average flush 3.5L)
SIZE & DIMENSIONS
Overall Dimensions	670 (L) x 360 (W) x 840 (H) mm
CERTIFICATION & COMPLIANCE
WELS Rating	4 Star Rating (3.5L average water consumption / 4.5L full flush / 3L half flush)
Compliance Standards	AS 1172.1 / AS 1172.2 Standards Australia
WaterMark Licence	WM-022642
PACKAGE CONTENTS
Included Components	1 x Melius 4.5/3L Vitreous China Cistern 1 x Melius Rimless Ceramic Pan 1 x Slim Seat 1 x Standard S-Trap Vario Pan Connector (90 – 120 mm) 1 x Internal Fill Valve & Flush Valve Mechanism Kit 1 x Floor Mounting Hardware & Fixings Kit
FEATURES
Feature 1	Rimless Hygiene Flushing — Fully open-rim bowl architecture propels high-velocity water along the interior contours, leaving nowhere for germs or limescale to hide.
Feature 2	Seamless Straight-Sided Skirt — Back-to-wall flat skirting hugs the tiled wall, fully enclosing plumbing connections for an ultra-clean appearance and single-wipe maintenance.
Feature 3	Dual Inlet Flexibility — Built-in versatility accommodates concealed top-rear water connections or exposed side bottom water supplies to simplify replacement projects.
REMINDER
Ceramic & Installation Note	DUE TO HIGH-TEMPERATURE CERAMIC FIRING PROCESSES, A MEASUREMENT DEVIATION OF ±5MM IS REGARDED AS A COMMON AND ACCEPTABLE INDUSTRY TOLERANCE. ALL PLUMBING ROUGH-INS AND WATER CONNECTIONS MUST BE COMPLETED BY A LICENSED PLUMBER IN COMPLIANCE WITH AS/NZS 3500 STANDARDS TO ENSURE PRODUCT WARRANTY COVERAGE.

Supplier's Gallery

Dimensions

Product Options

📐 Installation & Set-Out Compatibility Guide

The Kohler Melius™ Back-to-Wall Toilet Suite is universally designed for both wall (P-Trap) and floor (S-Trap) waste outlets. A standard Vario S-trap connector is supplied in the box. If you are installing with a P-trap wall outlet, the straight pan collar/connector is not included and must be purchased separately.

Tip: For S-Trap (floor), measure from the finished tiled wall to the centre of the floor waste pipe. For P-Trap (wall), measure from the finished floor to the centre of the wall waste pipe.

🔵 Option 1

P-Trap (185mm Wall Outlet)

Suitable for: Waste pipe exiting horizontally through the bathroom wall

185mm centre height Direct horizontal outlet P-trap pipe purchased separately

👉 Ideal setup if your wall waste pipe centre is fixed at 185mm above the finished tiled floor.

Kohler Melius Toilet S-Trap 90-120mm Setup

🟢 Option 2

S-Trap (90–120mm Standard Set-Out)

Suitable for: Waste pipe going vertically down into the bathroom floor

Set-out: 90mm – 120mm Vario connector included in box Standard floor rough-in

👉 Ideal setup if your floor waste pipe centre is located between 90mm and 120mm from the finished tiled wall.

🧭 Quick Selection & Plumbing Compatibility

Your Existing Plumbing Setup	Set-Out Range	Hardware Inclusion
Floor Waste (Standard S-Trap)	90mm – 120mm (Wall to Centre)	Standard Vario pan connector Included
Wall Waste (P-Trap)	185mm (Floor to Centre)	Straight pan collar / connector Not included (purchased separately)

⚠️ Essential Installation Checklist

Measurement Baseline: Always measure the set-out distance directly from the finished tiled wall, not from skirting boards or unfinished framing.
Flexible Water Inlet: This suite supports multiple inlet positions — top-left rear entry, bottom-left side entry, or bottom-right side entry.
Licensed Plumbing: Must be installed by a licensed plumber in accordance with AS/NZS 3500 and local building regulations to ensure WaterMark compliance.

Instruction

KOHLER BTW Melius Rimless Toilet Suite Resources

Technical specifications, product dimensions, and installation guides for the KOHLER BTW Melius Rimless Toilet Suite.

📄

KOHLER BTW Melius Rimless Spec Sheet (PDF)

Technical specifications, set-out dimensions, flush system details, and installation requirements.

View Spec Sheet

Note:Installation by a licensed tradesperson is recommended.

Buying Guide

Product Buying Guides
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Back to Wall Toilet Measurements: A Comprehensive Guide

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Close-Coupled Toilets vs Back to Wall Toilets: Understanding the Differences

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About Brand

Luxury dark bathroom featuring Kohler rain shower and fittings

🎨

Design-Led Expression

KOHLER products are crafted to elevate personal style, offering refined aesthetics that transform bathrooms into unique, expressive spaces.

⚙️

Intelligent Innovation

From advanced toilet technology to modern bathroom solutions, KOHLER integrates cutting-edge innovation to enhance comfort and functionality.

🛁

Complete Solutions

KOHLER offers a comprehensive range of tapware, toilets, and fixtures, making it easy to create a cohesive and fully customised bathroom space.

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Craftsmanship & Expertise

Backed by KOHLER’s global craftsmanship and KB Australia’s local expertise, every product is designed to deliver quality, reliability, and a premium experience.

Explore the KOHLER collection

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Browse the full KOHLER range and use filters to find the right product, finish and style.

Shipping

Delivery timeframes, order processing, pickup and delivery charges — everything you need to know about getting your order to you.

Last updated 12 August 2026

Free limited-time free shipping to Greater Sydney & selected nearby regions — not combinable with other discounts

0–3 days to process & dispatch in-stock orders

2–7 days metro delivery after dispatch for in-stock items

Shipping & freight
Delivery times
Order processing
Extra charges
Missed delivery
Pickup
Out of stock
Need help

01 Shipping & freight

For most items, shipping is calculated at checkout from your delivery postcode and cart, and the amount shown is the amount you pay.
Large or bulky items (for example baths and vanities), tiles and flooring delivered outside our free-shipping area require a freight quote. For these orders, the $1 shipping shown at checkout is a placeholder only — it is not the final freight cost.
After you place the order, our team will contact you with the actual freight cost for your address. We will not dispatch your order until you approve that cost. If you choose not to proceed, you will receive a full refund — no obligation.
Any free-shipping offer is a limited-time promotion shown on site and at checkout. It cannot be combined with any other offer or discount. MyHomeware reserves the right to make the final decision.

02 Standard delivery timeframes

Destination	Delivery time after dispatch
Metro areas (all states)	2–7 business days
Regional areas (all states)	7–15 business days

Delivery timeframes are estimates calculated in business days from the date of dispatch, not from the date the order is placed, and apply to in-stock items. For backordered items, please see Section 07. Actual delivery times may vary depending on the courier and destination.

03 Order processing & delays

You'll receive an Order Confirmation Email as soon as your order has been successfully placed.
Please allow 0–3 business days for order processing. In most cases, in-stock orders are dispatched within the first 24 hours.
Once your order has been dispatched, we'll email you the tracking information.

Some delays may occur due to circumstances outside our control:

Public holidays, peak trading periods and major sale events may extend processing and delivery times. During Christmas and major sale periods, please allow extra time.
Exceptionally high order volumes may occasionally extend processing times.

Remote areas: Courier networks may have delivery limitations for some remote postcodes. Where door-to-door delivery is unavailable, your parcel may be delivered to a local depot or Australia Post outlet, and you'll be notified when it is ready for collection.

04 Additional delivery charges

Additional charges beyond the standard delivery fee may apply where:

Stair or lift access is required — for example, where the delivery point is not directly accessible or goods need to be carried up stairs. Additional charges may apply due to the extra labour and time required.
The delivery location is difficult to access, or two or more people are required to complete the delivery safely.

Any additional charges are assessed on a case-by-case basis, quoted and agreed with you before we proceed, and billed on a separate invoice. No surprises.

05 Missed deliveries

If nobody is available at the delivery address during the agreed delivery window, a redelivery fee may apply.
Any additional charge will be communicated to you and agreed before a second delivery attempt is arranged.
Please ensure that you or an authorised person is available at the delivery address during the agreed delivery window.

06 Pickup

We'll prepare your order as soon as possible and email you a notification with your booking number and collection details once it is ready.
Please wait until you receive this confirmation email before coming to collect your order.

MyHomeware — North Rocks Showroom & Warehouse
Unit E, 21 Loyalty Road, North Rocks NSW 2151

Warehouse hours: Mon–Fri 9:00am–5:00pm · Sat 10:00am–4:00pm

Pickup and exchange services are not available on Sundays.

07 Out-of-stock & backordered items

Stock levels can change quickly, and occasionally an item may show as available but sell out shortly after your order is placed. If this happens, we'll email you and provide the following three options:

Cancel backordered items We'll remove the unavailable items and dispatch the remaining in-stock items as soon as possible.
Cancel the whole order Choose immediate store credit or a refund.
Wait for replenishment We'll hold your order until the backordered items arrive.

For backordered items, the 365-day return period begins on the date you receive the item — not the original purchase date.

Returns & refunds Our full returns terms — including the 365-day return window, restocking fees and custom-order exclusions — are available on our dedicated policy page. Read the Returns & Refund Policy →

Need help? Live Chat is the fastest way to reach us

Due to high call volumes, phone waiting times may be longer than usual. Our Live Chat team is available for extended hours and can usually assist more quickly with delivery timeframes, freight quotes, stock checks and order updates.

Live Chat — use the chat icon at the bottom right of your screen · Fastest response
Order & delivery enquiries — support@myhomeware.com.au
Pre-sales enquiries — sales@myhomeware.com.au

We reply to all enquiries within 1 business day.

Back to Wall Toilet Suites FAQs

Is a back to wall toilet better?

Yes, a back to wall loo is often considered better for modern homes due to its sleek, space-saving design and easy-to-clean surface. A back to wall wc conceals plumbing for a tidy look and offers improved hygiene with fewer crevices where dirt can collect. Many back-to-wall toilets for sale at MyHomeware also support efficient tornado or vortex flushing systems, making them both stylish and practical.

How to install a back to wall toilet?

Typically, you can follow these steps to install a back-to-wall toilet:
Check Set-Out: Measure the rough-in distance (e.g., 100–220mm for S-trap or 180mm for P-trap) to match your toilet model.
Position the Pan: Align the toilet pan flush against the wall, ensuring the back to wall toilet bowl sits level.
Connect the Trap: Fit the S- or P-trap using the adjustable connector (cut if needed).
Attach the Cistern: Secure the cistern to the wall and connect the water inlet (top, bottom, or back entry).
Seal and Test: Seal around the base with silicone, turn on the water, and test for leaks.
Note: The back to wall loo installation involves careful planning and measurements, and a professional installation is highly advised.

How to maintain a back-to-wall toilet for longevity?

To maintain your back-to-wall toilet for longevity:

Clean regularly using non-abrasive cleaners to protect glazed surfaces.
Use a rimless-safe brush to avoid scratching the back to wall toilet bowl.
Wipe down external surfaces to prevent dust buildup in tight gaps.
Check inlet and flush valves annually for wear.
Avoid harsh chemicals that can damage seals or soft-close seats.

Do back to wall toilets save space?

Yes, back to wall WCs are ideal for smaller bathrooms as the concealed cistern and compact design reduce visual clutter and maximise usable space, making the room feel more open.