A built under double oven, in case you are unsure, is different from the built in ovens. The difference lies in the location in the kitchen. The first double oven is installed beneath the kitchen table top, whereas the built in is eye level.
The advantage of the built under double oven is that you get to use space that may be sitting idle since most stuff placed underneath the kitchen top table is kept for the pots, pans, or even cleaning materials. In other words, with this double oven, you maximize your space, and it’s great if you have a small kitchen.
When buying your built under double oven, what you need to focus on are the size. There are 30 to 70 litres in size which means you can have a small kitchen but still enjoy the double oven. Another factor should be the power source. Most double ovens are electric mainly because this is the most convenient and easy to install. It also provides for a more even distribution of heat. However, new gas models are coming as well as halogen cooking sources. The advantage of the gas ovens is that you can be more specific in your heating temperature, which is great for baking and when you need to cook delicate food like fish or seafood.
Then, you have to consider the insulation and ventilation. Look for a double oven that comes with a built in fan to cool down the oven when it gets too hot. This is especially applicable for gas ovens which tend to heat up more on top than at the bottom, plus they heat up faster than the electric ovens.
Some of the double ovens that have consistently come out as good-to-rely on brands are the Bosch, Electrolux, New World, Siemens, Zanussi, Cannon, Miele, Hotpoint, Whirlpool, Smeg, Fagor, Baumatic, John Lewis, Indesit, Neff, Delonghi, and the Amana double oven.