Service & Parts

We put a lot of effort in the quality of our products. If, nevertheless, you have a question concerning service, please find the answers to the most frequently asked questions here.

Assembly video

You can install and assemble your own WISA XS concealed toilet system in 3 simple steps. Than it is finished and ready to use.The WISA product warranties give you peace of mind that all will be well for the coming ten years!

Replace parts

In the event that service is required, parts can easily be removed from the reservoir. The clamp, the flush valve and the hydraulic float valve can be removed with simple actions.

Float valve problems

If the reservoir fills up more slowly than usual, the membrane in the float valve may need to be replaced or the filter in the float valve may need to be cleaned. This can be done with a few simple steps.


BIM is a tool that promotes chain collaboration with the result that construction can be done more efficiently and faster. WISA strives to make a large part of its range available for application in BIM. We are happy to offer you these BIM files here.

Concealed cisterns systems

View the exploded view images of concealed cisterns.

Float valve

View the exploded view images of the float valve.

Frequently Asked Questions

Do you have a question about WISA products or services? Here you will find the answers to various questions. View the frequently asked questions. Is your question not listed? Then ask your question by e-mail to Our staff will gladly help you. f you prefer contact by telephone, please call +31 (0)26 362 90 20.

Question and answers concealed cisterns


The flushing volume of an XF reservoir can be adjusted by adjusting the float valve and the outflow mechanism differently. The float valve is set to a flushing volume of 3/6 liters as standard.

Question and answers exposed cisterns


Question and answers float valve