
Installing instructions for the professional
Extension kit for oset mounting (VDX) available
Extension kit for under-counter installation (UDX) available
Basic mounting kit RDX3
Application range of mounting kit RDX 3 – Art. No. 36100
Instantaneous water heaters of type DX3 can be installed by means of this mounting kit in the below situations.
The power supply cable is coming out of the wall at any place from behind the unit, but the wall has unusual surface conditions, making it difficult for installing 
the water heater.
The power supply cable is coming from elsewhere and has to be connected to the back of the unit.
Application range of extension kit VDX – Art.No. 34120 – Therefore RDX is necessary –
Instantaneous water heaters of type DX can be installed by means of this extension kit if the water pipes are coming displaced or exchanged out of the wall or if 
they are coming edgewise on the wall to the unit. The power supply could come out of the wall at any place under the unit or the wiring could be installed sur-
face-mounted. 
Application range of extension kit UDX – Art.No. 34110 – Therefore RDX is necessary
Instantaneous water heaters of type DX can be installed by means of this extension kit if the water-connections are expiring above the unit. The power supply 
could come out of the wall at any place under the unit or the wiring could be installed surface-mounted. 
In general
Installation of this part must only be conducted by an authorised professional. 
The operating and installation instructions of the heater has to be considered. 
The basic mounting kit has to be installed flushed on the wall. 
Caution!
The type of protection of the instant water heaters type DX3 complies to IP25. If you use the basic mounting kit, the type of protection of 
the units only complies to IP24. It is absolutely necessary to cross out the symbol of the type of protection IP25 on the rating plate and 
mark the field for protection class IP 24. 
 
Installing 
• Dismount the wall bracket of instant water heater DX. It is not used anymore.
• The installing should be done according to the enclosed drawings.
• Only make the necessary breakouts.
• Mount the connecting box with the opening facing downwards only.
• If the connecting cable does not reach into the device, the connecting box must be used.
Technische Änderungen, Änderungen der Ausführung und Irrtum vorbehalten. Subject to technical changes, design changes and errors. 9120-91105 10.22
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