Markt Hartmannsdorf

Markt Hartmannsdorf, Austria

Multi family house | 30 sqm installation

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Project summary Technical description Financing Development Downloads

Project Summary

This project is a 60 years old main building with a new constructed extension building, where a surgery is located.
The heat supply is realised by a 2-pipe plumbing with decentralised heat transfer units in each dwelling. There were radiators and floor heating installed for space heating. Besides the solar thermal system the biomass fired district heating supplies the building. During the summer months, when the district heating is deactivated, the solar system covers 100 % of the heat demand.



Type of building

Multi family house

Number of users / dwellings, floors

6 dwellings + surgery
2/3 floors

Year of construction


Total effective area (heated)

approx. 600 m2

Hot tap water consumption (measured/estimated)

approx. 110 m3/a (0.3 m3/d)

Whole energy consumption for heating purpose after CSTS implementation

34,300 kWh/a

System engineering

Year of construction of CSTS


Type of collectors

Flat plate collectors

Thermal power

19 kWtherm.

Aperture area of collectors*)

27 m2

Buffer storage

3 m3

Hot tap water storage


Total capacity of boilers with energy source

30 kW, district heating

Type of hot tap water heating


Type of heating system



Total cost solar system

14,250 Euro

Cost of the CSTS / gross area of collectors

475 Euro/m2


not available


Output of solar heat**)

11,700 kWh/a

Reduction of final energy***)

14,600 kWh/a

CO2-emissions avoided

0.7 t CO2/a

Solar performance guarantee


*) Aperture area = light transmitting area of the front glass
**) measured, between storage and piping to taps (solar system output)
***) related to the measured output mentioned before










TB Bierbauer, Passail


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Annotation to Good Practice examples from Austria

Concept definition and monitoring as well as system adjustment of the presented project have been done within the framework of "OPTISOL accompanied monitoring in demonstration projects for optimised and standardised solar systems for residential buildings", financed by the Austrian Federal Ministry of Traffic, Innovation and Technology ("Haus der Zukunft"), by the Austrian Federal Ministry of Economics and Labour and the Federal State Steiermark.