Siemens built-in frost free fridge freezers are fully integrated, so they sit behind a furniture door that matches your kitchen units. The freezer stays clear of ice, which means you never have to empty it out to defrost. The range covers the Siemens iQ100, iQ300 and iQ500 lines. It suits anyone fitting a new kitchen, or replacing an integrated fridge freezer, who wants a tidy built-in look without the defrosting.

The biggest difference between models is how the space is shared. Most have the fridge over the freezer with a 70/30 split, giving roughly 184 to 215 litres of fridge space and around 75 litres of freezer, which works well if you mostly buy fresh food. The iQ500 XXL and its iQ100 equivalent move to a 60/40 split, with about 285 litres of fridge and 98 litres of freezer for larger households. A 50/50 model suits people who batch cook or freeze a lot. Capacities vary widely, so check each model's housing size against your cabinet.

Door fixing matters too. Fixed hinge models attach the furniture door directly to the appliance, so the two move together. Sliding hinge models let the door glide on a runner, and are usually simpler to fit. Some iQ300 models add a hyperFresh box with humidity control, which helps fruit and vegetables last longer. Energy ratings are D or E, and a few models are internet connected.

Start with your housing size and hinge type, then the split between fridge and freezer. If running costs matter most, choose a D-rated model. To see every option, browse all Siemens built-in fridge freezers, or look through all Siemens products for appliances to match.