The old built-in fridge is to be replaced, the kitchen furniture remains. When searching you initially concentrate on a similar appliance height. For a suitable selection, however, the appliance and the existing installation situation must be brought together. A single external dimension is not yet confirmation for this.
Treat model and existing kitchen as two sources of information
Note the exact designation of the previous appliance, as far as it can be reached without risky dismantling. Lay any existing kitchen and installation documents alongside it. Mark what has changed since the original installation. A photo of the front can supplement, but does not replace a professional recording of the niche.
How different the specifications can look is shown by an actually read manufacturer page as an example: For the Miele K 7118 D appliance dimensions, requirements for the niche, fastening technique and maximum cabinet door weight are specified separately. The model is marked there as no longer available. [EINBAU] The article does not recommend it; the evidence merely illustrates why the installation specifications are more precise than a size designation.
Have the interface to the furniture front clarified
Please ask the retailer or specialist company to allocate the intended fastening and the existing front. The selection should relate to the specific combination. The article neither explains a system change as possible nor a prevailing door as suitable.
In the fictitious example an owner finds two appliances with similarly described formats. The executing company should confirm before ordering, based on the actual kitchen, which installation prerequisites apply in each case and whether further work would be necessary. The owner does not first buy the cheaper appliance and then improvise the connection to the furniture afterwards.
Connect recording and quote
Have the dimensions and prerequisites relevant for the order recorded by the responsible specialist. Ask which documents and notes will be used for the specific replacement model. Inaccessible connections or an unknown condition belong visibly in the clarification, not in an assumed standard solution.
Also discuss removal, installation and the intended handover as the scope of services. This organisational recommendation does not establish any disposal or delivery claims. If a component is not apparent from the offer, ask before purchasing.
Decide with a confirmed combination
In the end it should be clear which appliance is to be ordered with which declared installation situation and which works are included. If the model is later replaced, the prerequisites of the alternative must be reconsidered. The earlier confirmation does not automatically apply to every similarly designated replacement appliance.
The guidance applies to Germany and is not an installation or electrical manual. It does not adopt any dimensions or product functions of the manufacturer example as a universal rule. Its aim is a comprehensible fit decision before ordering, while repair or replacement of the existing appliance remains a separate prior decision.