Running costs and capacity
Compare like-for-like capacity and the applicable energy label. Actual running cost depends on use, settings and installation. Look at usable space or workload rather than only an advertised capacity.
Repairability and support
Check manufacturer warranty terms, local support and spare-part availability for the exact model. Ask whether major assemblies can be serviced separately. Keep the invoice, installation details and manual.
Plan the installation
Confirm location, clearance and connection requirements before delivery. Old connections or cabinets may not fit a new model. Agree who will install it and what the installation charge includes.