Choosing a Toilet: Wall-Faced, Back-to-Wall and In-Wall Cisterns

A small decision with daily impact

The toilet is used more often than any other fixture in the house, yet it is often chosen quickly from a showroom display. The right toilet makes a bathroom easier to clean, more comfortable, quieter and more water-efficient, and it shapes how the room looks. The wrong one can collect grime, waste water, suit nobody’s height and complicate plumbing.

This guide explains the main toilet types, features worth considering and practical points for homes in Drouin and West Gippsland, including properties on septic systems and tank water.

Toilet types

Close-coupled toilets

A close-coupled toilet has the cistern sitting directly on the back of the pan. It is the traditional suite found in many older homes. Close-coupled suites with exposed traps have curves and gaps around the base that collect dust and need extra cleaning.

Wall-faced or back-to-wall suites

Wall-faced or back-to-wall toilets have pans that sit flush against the wall, with the trap concealed inside the pan’s skirted shape. The cistern sits on top of the pan or is concealed. These suites have smooth, easy-clean sides and a contemporary look. They are among the most popular choices in renovations.

Wall-hung toilets

A wall-hung toilet is fixed to the wall with the pan suspended above the floor, and the cistern concealed inside the wall on a steel frame. The floor beneath is clear, which makes cleaning simple and gives a spacious, modern look. Wall-hung pans can be set at a chosen height.

In-wall cisterns with floor-mounted pans

Some suites combine a concealed in-wall cistern with a floor-mounted back-to-wall pan. This gives a clean look and saves space, with the stability of a floor-mounted pan.

Exposed cisterns in heritage styles

Period-style toilets with high or low-level exposed cisterns suit heritage homes and farmhouses, especially when paired with classic tiles and tapware.

In-wall cisterns: what to know

In-wall cisterns save space, because the cistern sits within the wall cavity rather than in the room. They also create a cleaner look, with only a flush plate visible.

Considerations include:

• Wall depth: a standard timber stud wall may need to be built out, or a dedicated frame installed, to fit the cistern.
• Access: the flush plate usually removes to give access for servicing. Choose a reputable brand with readily available parts.
• Structural support: wall-hung pans need a frame rated for the load.
• Rough-in timing: the cistern and frame must be installed during rough-in, before linings and waterproofing.

Pan features

Rimless pans

Traditional pans have a rim under which water flows during flushing, but the underside of the rim is hard to clean and harbours bacteria. Rimless pans have an open design that is easier to clean and often flushes more effectively.

Glazing and surface treatments

Many manufacturers offer special glazes that resist stains and make cleaning easier.

Trap types

Toilets connect to the waste using an S-trap, which exits through the floor, or a P-trap, which exits through the wall. The set-out, or distance from the wall to the waste, varies. When replacing a toilet without moving the waste, the new pan must suit the existing connection, or adjustable connectors may be used. In a full renovation, the waste can be repositioned to suit the chosen toilet.

Height

Standard toilet seats sit at around 400 mm above the floor. Comfort-height or raised-height toilets sit higher, which suits taller people and those who find it difficult to sit down and stand up. Wall-hung toilets can be installed at a chosen height.

Shape

Pans may be round, elongated or compact. Compact pans suit small bathrooms and powder rooms, while elongated pans tend to be more comfortable.

Seats

• Soft-close seats: close gently and quietly, preventing slamming.
• Quick-release seats: lift off for easy cleaning.
• Thick or slim profiles: affect appearance and comfort.
• Bidet seats: electric or non-electric seats with washing functions. Electric versions require a suitably positioned power point installed by a licensed electrician.

Water efficiency

Australian toilets carry a Water Efficiency Labelling and Standards (WELS) star rating. Dual-flush toilets with full and half flush buttons are standard, and many modern toilets use around 4.5 litres for a full flush and 3 litres for a half flush. On tank water, water-efficient toilets help conserve supply, particularly through dry summers.

Toilets on septic systems

Many properties around Drouin, especially in Jindivick, Drouin South, Labertouche, Buln Buln and Darnum, use septic tanks or other on-site wastewater systems. Most modern toilets work well with septic systems. Points to consider:

• Water-efficient toilets reduce the volume entering the system.
• Avoid flushing wipes or other products that do not break down.
• Adding a toilet may affect system capacity, so check before adding fixtures.
• Some systems have specific requirements, so check with the system’s manufacturer or service provider.

Toilets on tank water

On tank water with a pressure pump, toilets refill without issue in most cases. On gravity-fed systems with very low pressure, inlet valves suited to low pressure may be needed. We check your supply at the design consultation.

Accessibility

For ageing in place and people with limited mobility, consider:

• Comfort-height or raised-height pans
• Grab rails beside and behind the toilet, with wall reinforcement installed during framing
• Easy-to-press flush buttons
• Clearance beside the toilet for transfers
• A contrasting seat colour to help people with low vision

For bathrooms designed to accessible standards, specific clearances and fixture heights apply.

Placement and clearances

The toilet should have enough space in front and to each side to be comfortable. Doors should not hit the pan. In small bathrooms, swapping a hinged door for a cavity slider can solve clearance problems. Where possible, place the toilet so it is not the first thing seen from the doorway.

Separate toilet rooms

Many older Drouin homes have a separate toilet room. These rooms are often tiny, with little ventilation. Renovating them with a back-to-wall or wall-hung toilet, a compact hand basin, an exhaust fan and easy-clean surfaces makes them far more pleasant. Some households combine the separate toilet with the bathroom, while others keep it separate for convenience.

Finishes and style

Toilets are usually white, which suits almost any bathroom and makes cleaning easy. Some manufacturers offer matt black or coloured pans for a bold look. Flush plates for in-wall cisterns come in finishes to match tapware, from chrome to matt black and brushed brass.

Waterproofing and installation

Toilets in bathrooms sit within waterproofed areas defined by AS 3740. Floor wastes, pan connectors and penetrations must be sealed correctly. Wall-hung toilets and in-wall cisterns must be installed securely with all connections tested before linings close the wall. Plumbing must be carried out by a licensed plumber.

Common mistakes

• Choosing a pan that does not suit the existing waste set-out
• Forgetting wall reinforcement for future grab rails
• Not leaving access to an in-wall cistern
• Squeezing a toilet into a space with poor clearances
• No power point planned for a bidet seat
• Overlooking ventilation in separate toilet rooms

Questions to ask in the showroom

• Is the pan rimless?
• What is the set-out range?
• What is the WELS rating?
• Is the seat soft-close and quick-release?
• Are parts readily available?
• What height is the seat?

Powder rooms and guest toilets

A powder room near the living areas is a valued feature in many family homes, sparing guests a trip into the family bathroom. Compact wall-hung or back-to-wall toilets, a small wall-hung basin and a statement mirror or light make the most of a tiny space. Ventilation is essential, ideally an exhaust fan ducted outside on a timer or motion sensor. In newer Drouin estate homes, powder rooms are often part of the original design. In older homes, a powder room can sometimes be created from a former storeroom or part of a laundry, plumbing permitting.

Noise

In-wall cisterns and wall-hung toilets are often quieter when flushing because the cistern is insulated within the wall cavity. Adding acoustic insulation to the walls around a toilet, especially one beside a bedroom or living area, reduces noise further. Soft-close seats eliminate the clatter of a falling lid.

Planning for the future

Even if no one in the household needs it now, installing reinforcement in walls around the toilet during a renovation allows grab rails to be fitted later without opening the walls. Choosing a comfort-height pan now also suits most adults and becomes increasingly useful as people age.

Our approach

At a design consultation, we look at your existing plumbing, wall construction and floor, ask about how the household uses the bathroom and recommend toilet options that suit the room, the water supply and any septic system. During the renovation, we coordinate licensed plumbers for rough-in, install wall reinforcement where needed and make sure the toilet is level, secure and correctly sealed. A good toilet is one you rarely think about, because it simply works.

Cleaning and maintenance

Rimless pans, skirted sides and wall-hung designs make cleaning much easier. Use non-abrasive cleaners and avoid harsh chemicals that can damage glazes or seals, and, on septic systems, harm the beneficial bacteria. Check the flush valve and inlet valve if the toilet runs continuously, because a running cistern wastes a surprising amount of water, which matters on tank supply.

Comfort height and seat choices

Toilet pan heights vary. Taller, comfort-height pans make sitting and standing easier for older people and anyone with knee or hip issues, while standard heights may suit households with young children. Seats also differ: soft-close seats reduce noise and wear, quick-release hinges make cleaning around the seat simpler, and some seats are designed to suit elongated pans for extra comfort. Check that the seat and pan come as a matched set, because seats from other ranges may not fit neatly. If you are planning for accessibility, ask about pan heights, grab rail positions and clearances at the same time, so everything works together.

Water efficiency labels

Toilets sold in Australia carry WELS star ratings that show their water efficiency. Dual-flush toilets with higher star ratings use less water per flush, which matters for households on rainwater tanks around Drouin, Jindivick and Drouin South.

Replacing a toilet without a full renovation

Sometimes only the toilet needs replacing. A like-for-like replacement is usually straightforward if the new pan suits the existing waste position. Replacing a close-coupled toilet with a back-to-wall suite may leave a gap in floor tiles where the old pan sat, so check the footprint. Switching to a wall-hung toilet usually requires opening the wall and is best done as part of a renovation.

Our bathroom services

• Accessible Bathrooms
• Bathroom Design
• Bathroom Renovations
• Bathroom Tiling
• Ensuite Renovations
• Freestanding Baths
• Laundry Renovations
• Leaking Shower Repairs
• Shower Conversions
• Small Bathroom Renovations
• Vanities and Storage
• Waterproofing