How to install a wall-hung toilet

How to install a wall-hung toilet

Sebastian, self-taught DIY-er, Exeter

Guide written by:

Sebastian, self-taught DIY-er, Exeter

198 guides

Installing a wall-hung toilet is completed in several steps from removing the old toilet and modifying the plumbing to installing the cistern, support frame and flush mechanism. You’ll also have to conceal the frame before installing the pan, flush plate and toilet seat. Read on for our installation tips!

Important features

  • Installing a new unit
  • Replacing an old unit
  • Tools and equipment
  • Required skills
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Why install a wall-hung toilet?

Wall-hung toilets are stylish, comfortable and hygienic. 

  • Style: the toilet pan is the only part of the toilet on show.
  • Comfort: the height of the seat can be modified and the fill valve is quieter compared to a traditional toilet.
  • Hygiene: these toilets don't feature a base making them more hygienic and easier to clean. The cistern is hidden away meaning less chance of bacteria growth.

That said, installing a wall-hung toilet can be trickier and more expensive than fitting a traditional model. Nevertheless, these toilets offer a number of advantages, making them an increasingly popular choice in new builds and home renovations.

The major bonus of a wall-hung toilet is that it is designed to fit seamlessly into your bathroom.

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Drills

Installing a wall-hung toilet

When you start watching the Grohe installation guide below, you will notice that the handyman is installing a very specific type of wall-hung toilet: a self-supporting model on a frame.

While the process for installing wall-hung toilets won't change much between brands, some parts and measurements may vary. Factors that may differ include the finishing features or how easy the unit is to install (fixing the feet, mounting brackets, etc.).

It may surprise you to know that self-supporting wall-hung toilets are actually easier and more convenient to install when renovating a bathroom – although these are slightly more expensive to purchase.

Replacing an older toilet with a wall-hung toilet will be more challenging as you will need to work around the original toilet position and bathroom layout. In these types of situation, the aim is to install the new toilet as close as possible to where the previous unit was. 

Grohe wall-hung installation guide

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    1. Preparing to install


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    • Cut off the water supply at the valve.
    • If you are dealing with an old unit, empty the cistern and disconnect the toilet by dismantling the cistern followed by the toilet pan.


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    • Adjust the water supply line as needed: resize the copper piping, clean it up by sanding down the end and insert a compression fitting. 
    • Cut the waste pipe so it is as close to the ground as possible (+/- 5 mm).


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    • Insert a waste adaptor into the pipe. Sand down the ends of both parts and coat them with PVC glue before connecting them. 
    • Block the pipe temporarily to avoid any unpleasant odours.
    • Read the assembly instructions for the new wall-hung toilet and get your supplies ready. Gather all the assembly screws alongside their corresponding parts.
    • Lay out all the tools and accessories required for setting up the frame.
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    2. Assembling the toilet frame


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    • Assemble the vertical upright bars and horizontal support bars on the ground and screw them together loosely by hand. 
    • Next, use an open-ended or ratchet spanner to tighten. Place the fixing mounts onto the cistern and slide the flush pipe into place.
    • Make sure to insert the seals and to push all pipes and parts into a fully locked position. Attach the cistern to the frame using the provided slots to clip it into place. Then attach the fixing mounts and brackets
    • Pressure should be evenly distributed over the cistern: the screws mustn't be too tight, in order to avoid damaging the plastic. Install the feet fixings at the base of the frame. 
    • Attach the waste pipe clamp to the frame and insert the waste pipe. A clip system should beused to secure the pipe to the frame though this depends on the model.
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    3. Installing the toilet frame


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    • Draw a vertical line along the centre of the water pipe in order to position the toilet pan correctly and mark points to indicate the height of the frame
    • Using a spirit level, draw the line high enough to incorporate the position of the brackets.
    • Use a tape measure to mark out 40 cm from the ground for the toilet pan (though this can vary from 40-45 cm according to your needs).
    • Next, draw a line at 1 metre and mark it as (A), then draw another line at 1.08 metres and mark this as (B). These points will be used to map out the position of the wall brackets. Otherwise, follow the positions recommended by the manufacturer. 
    • Check that your horizontal lines are level using a spirit level from the left to the right of the vertical line you have drawn from the centre of the waste pipe. 
    • Position the frame and check the measurements and placement of the water supply line and waste pipe, as well as the space between the frame and the wall (this will vary according to frame depth). If necessary, use a waste pipe adaptor.
    • Mark out the location of the feet on the floor.

    4. Adjusting and fixing the frame


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    • Set the pan connector into place. Grease and insert an adaptor if needed.
    • Check the height of both the pipe (measure and cut as required) and the frame to make sure it matches up with the markings. 
    • Use a drill fitted with the correct drill bit to make holes where the wall brackets and the feet will go and insert the appropriate fixing plugs. Make sure to remove any dust from the holes so the fixings are held firmly in place.
    • Position the frame in line with the 'A' mark (the first line you drew).
    • Secure the feet and check that the frame is level using a spirit level before tightening the screws all the way and adjusting the feet if necessary.
    • Insert the threaded rods, nuts and washers into the brackets and adjust the frame's position using the rods.
    • A spirit level can then be used to check that everything plumb. Tighten everything and place the plastic clips over the wall brackets.
    • Position the clamp over the waste pipe.
    • PVC pipe adaptors should always be tested before gluing to ensure that they fit correctly. These parts should then be sanded down at both the male and female ends before glue is applied to each side.

    5. Installing the flush mechanism


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    • Remove the transport bracket by pulling on its handle. Be careful to not damage the mechanism or the pipe in doing so.
    • Connect the cold water connection to the shut-off valve then attach the water inlet hose and corresponding seals.
    • You can position the water supply line beforehand to face the mechanism. 
    • Be sure to check that the connections are watertight by turning the water back on (make sure the valve is closed at this point). Next, check that the water supply works by opening the valve, making sure you have a bucket in place to catch the water.
    • Connect the inlet hose to the flush mechanism and position the flush plate bracket. 
    • Insert the flush plate bracket by lightly tapping on it several times.


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    • Install the boards or unit used to conceal the frame (this might also be referred to as cladding) or build a stud wall using plasterboard.
    • Mark the cut-outs that will accommodate the different features (waste pipe, toilet pan and flush pipe) using the corresponding cutting templates. 
    • Mark out and cut panels to cover the frame's sides before securing them in place using the fixings provided. 
    • Most models offer a cutting template for the furniture unit used to conceal the cistern.
    • Cut out the various holes with a jigsawThe advantage of boxing in a frame, or installing a unit over it, is that these options offer easy dismantling – contrary to plasterboard which is then painted, tiled over or finished off with wallpaper. Whatever frame cover you decide to use, it must be waterproof.
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    6. Installing the toilet pan


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    • Assemble the flush pipe and waste pipe and connect them into position in the pan, making sure they are fully clipped in. 
    • Be sure to avoid damaging the seal when inserting – this will be easier if you use a twisting motion. 
    • Use a pen to mark where the pipes extend past the edge of the toilet pan (it's best to use a felt-tip marker for this). 
    • Remove the pipes from the toilet pan and insert them into position in the frame, making sure they are inserted fully into the slot. 
    • Mark the position of the pipes where they emerge from the frame
    • Carry this measurement over to the ends of the pipes. Measure the space between the two marks, adding 5 mm, then cut off the male end using a hacksaw
    • Use a support stand for increased safety
    • Smooth down the edges using a file or sandpaper for a better fit and insert them into the support frame.
    • Be sure to remove any leftover residue


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    • Insert the threaded rods into the fixing frame, letting them emerge as per the manufacturer's recommendations (usually 6 cm).
    • Spread silicone grease or soapy water onto the flush pipe to make it easier to insert into the pan.
    • Position the pan in line with the pipes and threaded rods and push it firmly into place.
    • You should also apply silicone grease onto the pan where the connections will go to make insertion easier. 
    • Insert the plastic guides then secure the pan using the provided nuts and washers.
    • Loosely tighten all parts, making sure that everything is level, then add the nut covers.
    • Screw everything into place approximately before tightening all the way.
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    7. Installing the flush plate


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    • Cut out the mounting bracket for the flush plate using a utility blade so it lies flush with the frame cover, making sure to cut straight using a continuous motion. 
    • Turn on the water supply and position the mounting bracket with the plastic springs facing downwards, then secure using screws.
    • Use a Phillips head or slotted screwdriver depending on the screw drive. 
    • Fit the mechanism into the bracket, connect the water supply line and insert the flush plate starting from the bottom of the panel. 
    • Apply light pressure to the top and corners of the plate to make sure it is correctly clipped in.
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    Phillips head or flat screwdriver 

    8. Installing the toilet seat and testing the toilet


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    • Test the flush mechanism to make sure it is working correctly.
    • Seal the connection between the toilet pan and the frame covering with silicone applied using a skeleton gun.
    • Dip your finger in soapy water and use it to smooth the silicone.
    • Avoid using sealant on the bottom of the pan so that you can easily detect any leaks.


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    • Install the toilet seat brackets , screw them into place and insert the plastic safety covers.
    • Position them according to the toilet seat placement
    • Position the toilet seat and insert it into the brackets.
    • The installation of your wall-hung toilet should now be complete. If you have any issues, the flush mechanism can be accessed by removing the flush plate.
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    How to install a wall-hung toilet

    Required skills


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    It's important to be able to take accurate measurements, identify the right accessories and know how to make sense of the assembly instructions. Being able to use a sawglue gun, screwdrivers, spirit level and a drill will also be extremely useful!

    Time required


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    3 hours or more (not including cladding construction).

    Number of people required


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    1 person.

    Wall-hung toilet kit components

    Frame

    • Frame with vertical uprights and horizontal support bars;
    • Feet, screws and washers;
    • Waste adaptor;
    • Waste pipe clamp and clip;
    • Waste pipe and cut-out template;
    • Flush pipe cut-out template.

    Fixings

    • Wall-mount kit (wall plugs and screws);
    • Floor-mount kit (fixing plugs and screws);
    • Wall bracket kit.

    Cistern

    • Cistern;
    • Flush pipe;
    • Mounting bracket and screws;
    • Shut-off valve and flexible water inlet hose;
    • Flush plate template.

    Flush plate

    • Flush plate mounting bracket;
    • Flush plate with button;
    • Screws.

    Toilet pan and fixings

    • Flush pipe and seal;
    • Waste pipe;
    • Ceramic toilet pan and threaded rods;
    • Toilet seat;
    • Toilet seat mounting kit;
    • Nut covers, nuts and washers.

    Tools and equipment


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    More information

    For DIY enthusiasts or anyone undergoing a full bathroom renovation, follow the links below for bathroom-related advice from our editors and more helpful guides:

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    Guide written by:

    Sebastian, self-taught DIY-er, Exeter, 198 guides

    Sebastian, self-taught DIY-er, Exeter

    Redo a roof with wooden beams? Check.Advise Mister everybody in the DIY shop? Check.Redo the bathroom plumbing? Check.Fit together, build the walls, paint a partition, throw my hammer in a rage thinking that it will fix the problem? Check. The DIY motto ? Learning is better than delegating… well, it's also a question about your wallet! The satisfaction? The beer at the end of the job! What do the best have in common? The influence of Gyro Gearloose, Mac Gyver and Carol Smiley depending on your generation, a good dose of curiosity, a average hand-eye coordination and a taste for risks… and if it doesn't work, try again! Advise you? I'll do my best!

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