Research suggests that up between 20 and 30 gigawatt-hours (GWh) of electric energy could be stored as useful heat in hot water.

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In brewing the tea the water should be hot, but not too hot.

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Assistance could be in the form of installation of draught proofing, loft insulation, hot water cylinder jacket or more effective heating controls and training on how best to use them.

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When it is shaken in hot water, bitumen comes away from sand and is sent to a separation vessel to be skimmed off.

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