Field help: (2024) Renewal of the heating system This text refers to the Steuererklärung 2024. You can find the version for the Steuererklärung 2025 at: (2025): Renewal of the heating system Renewal of the following heating systems is eligible for tax incentives: solar collector systems biomass systems heat pumps gas condensing technology ("Renewable Ready") hybrid systems fuel cells mini combined heat and power (CHP) (combined heat and power plants) connection to a heating network