Energy Saving Ordinance and Renewable Energies Heat Act
The Federal Ministry of Economic Affairs and Energy - generally in charge of the law - provides documents and information on a separate website (German language only):
Here are also provided:
Notes on application and frequently asked questions
The Federal Institute for Research on Building, Urban Affairs and Spatial Development (BBSR) developed for the application of the EnEV in coaction with the Renewable Energies Heat Act a
Manual for owners and planners [Download (German language only)].
The technical content of the manual does not apply to projects, if the application for a building permit dates later than 31st December 2015. Despite this, a look into the manual may be worthwhile because of methodical reasons.