Sometimes you just need an extra burner, but you just don't have enough room for a larger cooktop. That's why there are also single-burner cooktops. This provides you with an easy extra cooking zone to bring that one pan of potatoes or rice to the boil. It's also useful when you only want to quickly boil an egg when the other cooktop is occupied. Most models only come as freestanding versions, so you can store the cooktop in your cupboard whenever you're not using it.