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Thus in the example below, an insulated cube of about 2.8 m 3 would appear to provide sufficient storage for a single house to meet 50% of heating demand. This could, in principle, be used to store surplus wind or solar heat due to the ability of electrical heating to reach high temperatures.
The system was sold in two varieties: a cube and a 2-player value pack. The cube box version was the version sold in stores. It included the system, controller, an X-Men game disc, and 6 X-Men cards. Two-player value packs were sold online (but may have been liquidated in stores) and included an extra controller and 12 additional X-Men cards.