What control function does a 'desuperheater priority' mode provide in an advanced geothermal heat pump controller?
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A
It gives space heating priority over domestic hot water generation at all times
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B
It allows the heat pump to run specifically to satisfy domestic hot water demand when the storage tank temperature drops
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C
It prevents the desuperheater from operating during the cooling season
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D
It forces the water heater element to fully heat the tank without any heat pump input