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The amount of hot water used for bathing is 100 tons, intended for employees to use as hot water for bathing. Solar energy is selected as the main heat source, while an electric boiler is used as a backup heat source for domestic hot water. 2) Air source heat pumps are selected to meet the needs of wellhead antifreeze and office heating and cooling. Wellhead antifreeze and office heating can be linked with bathing hot water.