What is the primary energy factor of energy from wastewater?

Wastewater has a primary energy factor of 0; added to this is only the primary energy factor of the auxiliary energy needed for the heat pump. Taking the heat pump into account, the primary energy factor of wastewater heat in new buildings is generally between 0.4 and 0.45. All of the KfW bank’s energy efficiency standards can be met with wastewater heat.

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