Preheating for the airing When there is already a depp drilling for the heat pump, it's possbile to preheat the air for the air to air heat exchanger with this water to air heat exchanger.  

Preheating for the airing

When there is already a depp drilling for the heat pump, it's possbile to preheat the air for the air to air heat exchanger with this water to air heat exchanger.

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