Berlin, Germany

Berlin (Germany)

Demo responsible: BoostHEAT

Type of building: Small residential. House with 2 apartments (220 m2) in the town center of Berlin. Solar energy potential: 10 m2. Existing individual gas boiler per flat for supplying Domestic Hot Water (DHW), space heating through radiators. Yearly heat demand: 60MWh,th

Demonstration action:

  • TP1, Parallel integration: Solar thermal (TVP) for space heating and for domestic hot water (DHW). The heat pump boiler (BoostHEAT) will be used to cover non-solar periods. 
  • Solar panels installation on flat roof and connections to the cellar room
  • BoostHEAT and thermal energy storage (RATIOTHERM) installation in the cellar
  • Integrated control system for the smart operation of H&C
  • Redesign centralized space heating and DHW distribution system for the 2 flats
  • DHW and space heating meters per flat for operation costs breakdown

Replicability potential:

  • Small residential (single houses) with natural gas connection. New and renovated buildings.
  • All climates

Technical risks:

  • Access to the cellar for integration of the 2,000 l solar storage tank: division of the storage tank into a smaller tank
  • Overheating in the absence of heat demand: safety connection to the outdoor fan coil unit in the outdoor area from the BoostHEAt circuit

Difficulties encountered:

Most of the difficulties encountered are related to the fact that it is an historical building, such as

  • Roof reinforcement requirements path availability for pipes, chimney and wires (roof, ceilings, limited door, stairway, and basement room dimensions for components handling and installation)
  • Tilted roof integration late requirement caused the replacement of TVP high vacuum panels solution by standard solar thermal panels
  • Synchronizing owner parallel renovation work with SunHorizon TP1 integration work regarding financial, design, and installation decisions
  • Finding professional installers for a quite complex system integration in building in the extremely dynamic market after Covid-19 crisis

Estimated savings and impact:

  • 32% primary energy and GHG emissions savings

  • 25% renewable energy ratio

  • 578€/year cost bills reduction

Warning: the estimation has been done without taking into consideration the domestic hot water recycling loop because it was decided late.

Demo Berlin


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