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Drain water heat recovery systems use the heat of outgoing wastewater to preheat incoming freshwater. This is one of the few ways to reduce the energy needed to heat water without sacrificing comfort. For more on passive heat recovery from wastewater, see Passipedia.
Passipedia
Here you will find Passive House components for your projects!:
We're here to support you in your search for suitable Passive House components. Simply select the location where the product is to be used. The Passive House Portal then lists the certified components that are available for this climate zone.