Kept at room temperature, perishable foods can become unsafe after two hours--or even less time in hot weather. By keeping food at a temperature equal to or above 140°F, a food warmer can help prevent restaurant customers or party guests from getting sick. Beyond making food safer, warmers do not alter the taste of the food, keeping it fresh for hours.

Food warmer models are varied and are suited for virtually every possible use. A small countertop food warmer can be used in the kitchen to keep a meal piping hot for the whole family. The insulation system in a food warmer will prevent both the exterior of the unit and the countertop from getting too hot. A travel food warmer can be carried along in car journeys, picnics, camping, or boating trips. This kind of food warmer is usually plugged into the lighter socket of a vehicle and can also be taken to tailgate parties.

Food warmers and stainless-steel chafing dishes are especially popular among those who like to hold big parties. They offer the possibility of preparing the food in advance, serving it all at once, and keeping it warm even for latecomers. This is also the reason catering services use them as a way to keep the food hot and safe for parties, reunions, or conferences.

Heat lamps and commercial food warmers are quite popular in the food service and retail industries. They are often used by restaurants and cafeterias and in hotels or clubs to hold individual food or buffet items and evenly distribute heat. Beyond this use, many models offer the possibility of displaying the food while keeping it warm.