Tilburg, Netherlands

Multi-family house | 82 sqm installation

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Project summary · Technical description · Financing · Development · Downloads

Project Summary


Social housing association WonenBreburg realised a 82 m2 collective solar thermal system on the roof of one of their apartment buildings with 6 floors and 95 dwellings. The system is placed as part of an overall renovation of the building, including the façade, entrance, bathrooms and toilets and the hot water system. Small individual gas-fired kitchen tap water heaters that emitted exhaust gases into the dwellings have been replaced by a central solar hot water system. The realisation of this system fits in WonenBreburg’s policies and in the energy covenant agreements closed between the social housing associations in Tilburg and the municipality. 




Type of building

Multi-family house

Number of users / dwellings, floors

95 dwellings
6 floors

Year of construction


Total effective area (heated)

7,125 m2

Hot tap water consumption (measured/estimated)

1,734 m3/a (calculated)

Whole energy consumption for tapwater heating purpose after CSTS implementation

194,180 kWh/a

System engineering

Year of construction of CSTS


Type of collectors

Flat plate collectors

Thermal power

58 kWtherm.

Aperture area of collectors*)

82 m2

Buffer storage

2 m3

Hot tap water storage

not available 

Total capacity of boilers with energy source

not available
(district heating)

Type of hot tap water heating


Type of heating system



Total cost solar system

44,400 Euro

Cost of the CSTS / gross area of collectors

539 Euro/m2


17 %


Output of solar heat**)

37,767 kWh/a

Reduction of final energy***)

53,952 kWh/a

CO2-emissions avoided

10 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



W. van Koert, manager new construction/refurbishment:

"In our experience the ‘solar renovation’ of hot water systems leads to higher comfort and better indoor climate without raising the overall housing costs for our tenants. In this way we maintain and improve the property value of our building stock."






Housing association
J. van Oisterwijkstraat 35
P.O. Box 409
5000 AK Tilburg, Netherlands

System manufacturer 

Itho BV
P.O. Box 21
3100 AA Schiedam, Netherlands


Ballast Nedam
P.O. Box 147
5600 AC Eindhoven, Netherlands

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