You are recovering the heat from the ventilation, yes. But you're doing so using a heat pump. Check out e.g. Nibe F750 with SAM40. I'm using the heat pump to

You are recovering the heat from the ventilation, yes. But you're doing so using a heat pump. Check out e.g. Nibe F750 with SAM40. I'm using the heat pump to heat water using the extracted air. That water is then used for floor heating, ventilation air heating and ofc. hot water.