 When using your oven, there are two main types of heat. A conventional oven uses heat sources at the top and bottom of the oven. Heat travels to the centre of the oven by natural conduction, making them ideal for baking pastries and scones. A fan oven circulates the heat around more evenly in the oven, which makes it ideal for making bread. A fan oven has a more powerful heating effect and runs more efficiently, which means that cooking times can be reduced, saving you a bit of time and money off your energy bill.