How to Adjust a Duravit Wall-Hung Toilet

Before you start

A Duravit wall-hung toilet has three elements you can adjust: the carrying frame inside the wall, the bowl that mounts on it, and the flush actuator that sits flush in the finished wall. The frame determines height and level. The actuator controls water volume and the flush button feel. Each is adjusted differently, and the order matters.

If you are buying new and have not installed yet, see wall-hung toilet requirements and wall-hung toilet load capacity before choosing a model. If you are adjusting an existing toilet, confirm the shutoff valve works before you start. You will need a spirit level, an Allen key set, and a flat-head screwdriver for most adjustments.

• Turn off the water supply at the shutoff valve before opening the flush actuator or touching the frame connections.
• Have a small container and towel ready to catch water left in the supply line.
• Take photos of the actuator and frame connections before disassembling anything: they help you reassemble in the right order.

Adjusting the seat height

Duravit wall-hung bowls mount to a carrier frame with two vertical studs. The bowl's mounting brackets slide along these studs. Loosen the locking nuts on both studs, slide the brackets to the desired height, then retighten. The height you choose is usually the distance from the finished floor to the top of the bowl rim.

Most households prefer a chair-height rim between 16 and 18 inches from the finished floor. ADA-compliant public and commercial toilets install lower. ADA height is covered in more depth in ADA toilet requirements and chair-height vs ADA height. For a family with mixed ages, you can split the difference, as discussed in the guide on toilet height for mixed families.

If you have already tiled the floor, account for the tile thickness when measuring. Set the height so the rim ends up at the intended distance after the floor finish is in place. On some Duravit frames, the studs also let you tilt the bowl slightly forward or backward, which affects both level and comfort. Do the final height check only after the bowl is hung and the frame is fully secured.

Plumbing the bowl

A wall-hung bowl that is not level will rock on its brackets, cause the seat to sit crooked, and lead to uneven seal wear. Plumb means the bowl is level side to side and sits at the correct angle front to back. Most installers check side-to-side level first, then the front-to-back tilt.

Place a spirit level across the rim. If the bowl tilts left or right, loosen the bracket nuts and insert thin spacers between the bowl bracket and the frame on the low side. Duravit frames often have slotted holes that let you shift the bracket laterally before locking it down. Retighten and recheck until the bubble is centered.

The front-to-back tilt is set at the frame, not the bowl. The frame's feet or wall anchors adjust the distance from the wall. Turn the adjustment screws at the base of the frame feet to move the bottom of the frame closer to or farther from the wall. This tilts the bowl slightly up or down. A very slight backward tilt, about 1 to 2 degrees, keeps water from pooling at the front edge, but the exact angle is a matter of preference.

For more on how bowl position interacts with the space around it, see wall-hung toilet buying guide and floor-mounted vs wall-hung toilets.

Adjusting the flush volume

Duravit wall-hung toilets typically use a dual-flush actuator mounted on the wall plate. The actuator houses a pneumatic valve that sends air to the flush tank inside the frame. The full and reduced flush volumes are set by two small dials on the back of the actuator. Turn one dial to change the full flush volume, the other for the reduced flush. Turning clockwise increases volume on most models, but check the arrows printed on the dial.

Flush volume matters for both water efficiency and waste clearance. EPA WaterSense criteria cap tank-type toilets at 1.28 gallons per flush and require them to remove waste reliably, as described in the WaterSense specification. Set the reduced flush for liquid waste and the full flush for solid. If you have hard water, see the guide on toilet hard water protection before changing volumes: mineral scale can make an already low-volume flush weaker.

To access the dials, remove the actuator from the wall plate. On most Duravit actuators, the plate pulls off, then the actuator slides out. Disconnect the pneumatic hose by pressing the release ring, never by pulling the hose itself. Then set the dials to the volumes you want. Reconnect and push the actuator back until it clicks.

Adjusting the flush button feel

The flush button itself can sometimes feel stiff or travel too far. This happens when the pneumatic piston inside the actuator is not seated correctly. Push the button a few times with the water off to feel the stroke. If it sticks, remove the actuator and check that the piston moves freely, then clean the inside with a dry cloth. Do not lubricate the piston with oil, it attracts dust and can damage the seal.

If the button does not spring back, the hose may be kinked. Check the pneumatic hose for sharp bends where it exits the actuator and enters the frame. Route the hose with a wide curve. A kinked hose also changes the flush volume because air cannot reach the flush valve. For volume and button feel problems together, the hose is the first thing to inspect.

If the flush is weak or incomplete after adjustment, see how to fix toilet not flushing fully and toilet flush volume guide for next steps. Also check how dual flush toilets work if you are new to dual flush and want to understand the two-button behavior.

Adjusting the seat and maintenance after adjustment

After you set height, level, and flush, check the seat. Duravit wall-hung toilets use a top-fixing seat hinge. If the seat shifts or the gap between the seat and bowl is uneven, loosen the hinge screws under the seat, slide the seat to center it, and retighten. For seat angle problems, see how to adjust toilet seat tightness.

Do a final inspection after any adjustment: flush twice and look for leaks at the bowl-to-frame seal and at the actuator. A running flush after adjustment often means the pneumatic hose was not reconnected firmly. Also check the gap between the bowl and the wall: it should be uniform. A wider gap on one side indicates the frame is not level, which you can fix at the feet.

For long-term care, see how to maintain a wall-hung toilet and wall-hung toilet frame leak if you suspect the frame connections are leaking. If the bowl wobbles and you cannot fix it with the brackets, see the guide on wall hung toilet wobble repair.

What to adjust based on your situation

Questions

How do I raise the height of my Duravit wall-hung toilet?

Loosen the locking nuts on the two vertical studs of the carrier frame, slide the bowl mounting brackets up to the desired height, then retighten the nuts. Access to the frame is behind the wall, so do this before the wall is finished or through the service opening if one exists.

Why does my wall-hung toilet wobble side to side?

A side-to-side wobble usually means the bowl bracket is not fully tightened or the bracket is not sitting flat against the frame. Loosen the bracket, insert a thin spacer on the low side to level the bowl, and retighten both bracket nuts evenly.

How do I adjust the flush volume on a Duravit actuator?

Remove the wall plate and pull the actuator out. On the back are two dials, one for full flush and one for reduced flush. Turn the dial clockwise to increase volume on most models. Reconnect the pneumatic hose and push the actuator back into the wall plate until it clicks.

My Duravit flush button sticks. What should I check?

Remove the actuator and check the pneumatic piston for dirt or a kinked hose. Clean the piston with a dry cloth and route the hose with a wide curve. Never oil the piston. Reinstall and test. A kinked hose is the most common cause of a sticking button.

What happens if I set the flush volume too low?

The bowl may not clear waste in one flush, which can lead to double flushing and higher water use overall. Set the reduced flush for liquid waste and keep the full flush high enough to clear solid waste. The EPA WaterSense specification requires that a 1.28 gallon flush still meets performance criteria, but not every bowl behaves the same, so adjust in small increments.

Can I adjust the tilt of the bowl without removing it?

For front-to-back tilt, you adjust the frame feet at the base of the carrier. These screws move the bottom of the frame closer to or farther from the wall. You may need to access the feet from a service opening or the unfinished side of the wall. Side-to-side level is set at the bowl brackets directly.

Why does the seat slide forward after I level the bowl?

A seat that slides forward usually means the front-to-back tilt is too flat or the seat hinge is worn. Slightly increase the backward tilt at the frame feet to keep the seat in place. If the hinge is worn, replace the seat hinge rather than adjusting the bowl angle.