Grünberger Straße 15

Berlin-Friedrichshain, Germany

Multi-family house | 21 sqm installation



The assessment deals with a solar thermal system to be installed on a 105-years-old building in the east centre of Berlin. The building was renovated in 2002, the solar plant was examined as addition to the existing heating system.
The building was chosen for assessment by the action of the so called "Solar agents"– students of a school nearby identified the building as suitable – the investors responded with high interest and motivation.
The building is suitable for a solar thermal plant – the collectors may be integrated on the south orientated pitched roof part of the so called "Berliner Dach". Most attractive is a system for hot water generation, the assessment compared three system variants.



Type of building

Multi-family house

Number of dwellings, floors

14 dwellings + business area

Year of construction


Total effective area (heated)

1,038 m2

Hot tap water consumption

ca. 380 m3/a
(1,040 l/d)

Whole energy consumption for heating purpose (present situation)

not available

Proposed CSTS (main variant)

Type of collectors

Flat plate collectors

Thermal power

14.2 kWtherm.

Aperture area of collectors*)

20.30 m2

Buffer storage


Hot tap water storage

1.6 m3

Total capacity of boilers

100 kW

Type of hot tap water heating


Type of heating system


Estimated Costs

Total cost solar system

19,000 Euro

Cost of the CSTS/gross area of collectors

850 Euro/m2

Available Subsidies

37 %

Predicted System Output

Output of solar heat

9,820 kWh/a

Reduction of final energy

ca. 13,000 kWh/a
(1,300 m3 gas / a)

CO2-emissions avoided

2.9 t CO2/a

*) Aperture area = light transmitting area of the front glass


Proposed System Scheme



Hausverwaltung AMO Grund

Assessment by

Berliner Energieagentur GmbH



This assessment summary (English)

376 K


Detailed assessment report, 24 pages (German)

0.9 M