Modern kitchen stoves may use alternative methods for heating food. Natural gas and electric stoves are the most common today in western countries. Both are equally effective and safe, and the choice between the two is largely a matter of personal preference and pre-existing utility outlets: if a house has no gas supply, adding one just to be able to run a gas stove is an expensive endeavor. In particular, professional chefs often prefer gas cooktops, for they allow them to control the heat more finely and more quickly. On the other hand, some chefs often prefer electric ovens because they tend to heat food more evenly. Today's major brands offer both gas and electric stoves, and many also offer dual-fuel stoves combining gas cooktops and electric ovens.