With a built-in combi microwave, you get an oven and microwave in one. Use the oven function to bake pies and quiches, and use the microwave function to quickly heat up leftover food or a bottle of baby food. All built-in microwave ovens have a grill function for that crispy layer on your oven dishes. It's important to measure the exact dimensions of a built-in microwave to make sure it fits in your kitchen. The installation height of built-in microwave ovens is 38 or 45cm.