What is the difference between a dome-vaulted oven and an oven with a flat vault?

The main difference between a dome-vaulted oven and a flat-vaulted oven lies in the greater compactness of the firing chamber: in the flat vault, the amount of air to be heated is less than in a traditional dome vault, so heating is quicker and consequently operating costs are lower. This also results in faster cooking times with the same consumption.