Heat storage uses off peak electricity to create heat that is stored and slowly released as needed. The heat is generated through an element embedded in the storage core of the heating unit. Air is passed over the heating element through natural or forced convection, to slowly distribute warmth throughout the room. Off peak tariff is recommended for heat storage. It supplies electricity for eight hours overnight and another five hours during the day to provide continuous 24 hour heating.

There are two types of storage heaters: