Inside climate-friendly heating cellars.

Tag des offenen Heizungskellers is a nationwide day of action in which homeowners open their doors to show how climate-friendly heating technology works in everyday life. The day is run by a coalition that includes homeowners, volunteer teams and municipalities. Visitors can ask questions at eye level and get answers without any sales pressure. The aim is to provide practical insights, strengthen neighbourhoods and lower the hurdles to modernisation – practical, non-commercial and non-partisan.