Gas powered infrared lamps are usually used in commercial warehouses. They are heat intensive and must be positioned at least ten feet away from the person or area to be heated.
Electric infrared heat lamps are most often used in homes. They used to be more common, but with the advent of new types of bulbs that diffuse various levels of heat and colors, consumers have a wider selection to choose from and it's rarer to see the infrared bulbs in use. Infrared bulbs are most commonly used today for heat lamps in bathrooms.