Pumped Heat is a start-up company established to commercialise a high energy density heat storage (300kWh/m3 excluding insulation) called ‘RockyRoad’ that can charge using electricity from renewables and discharge heat as required. The cost of the heat storage is 5-10 X lower than batteries of the same capacity. The efficiency for load shifting heat is above 80% at domestic scale and 90% at industrial scale. 

The heat can be used for cooking, hot water, heating and steam generation with both high-power outputs and inputs possible.
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