Power-to-Heat (abbreviation PtH or P2H). This can be done with conventional electric heaters and heat pump systems. With PtH systems, the excess power can be used. Hence fossil energy sources and emissions in the heating area could be saved. In contrast to simple electric heating systems, such as, When there are excess energy the heat production can be used. In order to increase flexibility power-to-heat systems are often coupled with heat accumulators. The power supply occurs for the most part in the local and district heating networks. Power-to-heat systems are also able to supply buildings or industrial systems with heat.