While some milk frothers are capable of heating milk, not all of them have this feature. The key design element all good milk frothers share is a spinning whisk head that aerates the milk to produce foam. However, only electric, pitcher-style milk frothers can heat milk. On the other hand, wand-style frothers, powered by batteries, are intended for creating foam in cold milk or milk that has already been heated on the stove or in the microwave before frothing.