Connecting the washing machine to the washbasin

Connecting the washing machine to the washbasin

Until today, it is not self-evident that there are separate connections in rental apartments are available for the washing machines. If the necessary water supply is not available, you must resort to alternatives to connect the machine so that you can easily wash your laundry. In many apartment buildings, for example, such a connection is available in the basement, so you can set up your washing machine there. Another option is to connect the washing machine to the sink. If you are wondering how this works and what materials you need, you should take the time to read this article carefully. It certainly offers the right answers for every question.

Requirements for connecting the washing machine

Actually, a washing machine needs special connections. If these are in the bathroom, it is no problem to properly connect the washing machine. If, on the other hand, you move into an apartment that does not have a washing machine connection, you need to think of an alternative if you do not want to clean your laundry in the launderette. To connect the device nevertheless, the following conditions are necessary: ​​

  • Drain for the water
  • Water supply
  • Power connection with 230 Volt

Many tenants of apartments without separate washing machine connection decide to connect the machine directly to the sink.

There is no power connection - what to do?

In bathrooms that have been designed to old standards, most of the time there is a lack of power connections. When power is present, the connections are often mirrored to prevent electrical appliances from falling into the bath, shower or sink. It therefore makes sense to install a power outlet that is lockable and only used for the washing machine.

You may only install the new power connection if you have a good knowledge of electricity and know how to do it Washing machines can be connected in damp rooms such as the bathroom. Otherwise, please contact a specialist!

The newly installed connection should be an outlet that is especially suitable for use in damp areas.

Requirements for Angle Valve and Siphon

Most likely, the siphon will not touch the sink have the turn that would actually be necessary. Also, the angle valve is certainly easy. However, the port on the siphon should have an odor trap, so you should use a dip tube siphon with a 3/4 inch side port. As corner valve, a conventional combination angle valve is suitable, which is also referred to as duo-check valve or double-spindle valve. If these connections are feasible, it is no longer a problem to connect the washing machine to the sink.

Step-by-step instructions - How the connection works

In the following section we will inform you about the materials and tools you need

Required utensils

The following materials and tools should be purchased in advance.

  • Siphon with side washing machine branch and odor trap
  • Double angle valve with two connecting threads
  • Material required for installing the electronics in damp rooms
  • Surface-mounted socket
  • Hemp for wrapping the threads on the tubes

You will find the accessories you need in any well-stocked hardware store. Even a search on the Internet can be worthwhile, since most parts and tools are offered there very cheaply.

  • Water pump pliers
  • Larger pipe wrench (optional)
  • Fork-ring wrench set (optional)
  • Screwdriver for hose clamps (optional)
  • Spirit level
  • Necessary tool for electrical installation
  • Bucket to hold the Water to catch when changing the siphon

Step 1: Prepare the connections

First, lay all necessary connections or prepare them yourself. But remember to only do the power installation yourself if you have sound expertise in this area. Otherwise, it is necessary for your own safety to hire a specialist.

Step 2: Disassemble the old siphon

Then remove the old siphon from the sink. Catch the draining water with the bucket and attach the new siphon, which has a side outlet and an odor trap. Use the hemp to wrap around the external threads.

Step 3: Attach the new angle valve

Now you need to replace the simple shut-off valve.

First turn the main water tap on. Inform the other tenants in advance in good time if you live in an apartment building and want to turn off the water via the tap.

Then unscrew the old angle valve and attach the new double valve.

Step 4: Connect the washing machine under the washbasin

For a new appliance, you must now completely remove the transport safety devices. Then you can connect the supplied hoses to the machine.

Normally the hose for the waste water is corrugated. For a device that has an Aquastop system, the hose with the plastic box is used to feed the water.

If in doubt, it is worth looking at the user manual if you are not sure how to connect the washing machine.

Step 5: Align the Washing Machine

Finally, it's time to put the washing machine in its final position so you can align it to your own liking. Modern washing machines have legs that can be turned on or turned off. It is best to set up the device with the help of a spirit level. Check with the top of the machine if the stand is straight. Now you can turn on the water at the shut-off valve and plug the mains plug of the washing machine into the new socket. To be on the safe side, run a test run to be sure all connections and lines are tight.

Other Tips and Tricks

Sometimes it may not be necessary to replace the siphon. New washing machines are supplied with a bow. There, the sewage hose can be inserted. The free end has the shape of a hook and can be hung on any standard toilet or sink. If you find this tube a visual blemish, you can remove it after washing and reattach it before rinsing again.


You see, it is a good alternative to connect the washing machine to the sink if you do not have a separate one Washing machine connection available. In this case, only a few requirements must be met and, where appropriate, the connections prepared accordingly. Therefore, you should always check whether it is technically possible to connect the washing machine to the washbasin in the bathroom before you put your washing machine in the basement or even completely without your own washing machine and clean your laundry in the laundromat. Incidentally, this variant can also be used if you want to connect a dishwasher in the kitchen, but have no special connections.


In some apartments there is no separate washing machine connection in the bathroom or in the kitchen. In this case, it is possible to connect your own washing machine directly to the sink. For this you need a power connection, which should be suitable for wet rooms and therefore should be laid by a specialist. In addition, you should have a water pump pliers, a pipe wrench, a screwdriver for pipe wrenches and a spirit level ready for the connection work. Likewise, it is usually necessary to replace the siphon and the angle valve, whereby both elements have to fulfill certain conditions for the connection to function properly.

Article picture: © HamsterMan / Shutterstock