Small household appliances are electrical devices for electromotive or electric heat applications. They are mostly used in private households but also in the commercial environment. Typical examples are vacuum cleaners, coffee machines, kitchen machines, bread makers, espresso machines, microwaves, bar mixers, toasters and water heaters. Household small appliances are subject to official energy efficiency criteria. They are connected to the power supply for operation, and some devices are powered by batteries or rechargeable batteries.