When it comes to fuel source there are two kinds available inside your oven; gas or electric.
use a heat source placed at the bottom of the cavity. As hot air rises this creates heat zones with the highest temperature at the top and the lowest at the bottom. Modern gas ovens are often “zoned” to take advantage of this. So the middle shelf will be the temperature you have selected to cook at and the shelf above will be a gas mark higher while the shelf below will be one lower. This is good for cooking multiple dishes in the same oven but not for cooking the same dish on different shelves (like pizzas). Older, conventional electric ovens with a single heating element
also work in this way.
Electric ovens can work in a variety of ways and either use a conventional heating
method or are fan assisted
to distribute heat evenly between the shelves. In fact by using different combinations of heating elements and fans some multifunction ovens
are able to provide better ways of cooking different dishes. Fan assisted
ovens improve the distribution of heat as they actually reduce the time and temperature required to cook food – which is good because it saves money on electricity.
There are some fan assisted gas ovens on the market however these tend to be expensive.
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