Tilburg, Netherlands

Multi-family house | 247 sqm installation

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Project summary · Technical description · Financing · Development · Downloads

Project Summary


Social housing association WonenBreburg realised a 247 m2 collective solar thermal system distributed on the roofs of three blocks of the Mendelsohn building complex with a total of 144 dwellings. The system is placed as part of an overall renovation of the complex, including the hot water system and mechanical ventilation. Small individual gas-fired kitchen tap water heaters that emitted exhaust gases into the dwellings have been replaced by a central solar hot water system.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

144 dwellings
6 floors

Year of construction


Total effective area (heated)

12,528 m2

Hot tap water consumption (measured/estimated)

2,628 m3/a (calculated)

Whole energy consumption for tapwater heating purpose after CSTS implementation

294,336 kWh/a

System engineering

Year of construction of CSTS


Type of collectors

Flat plate collectors

Thermal power

173 kWtherm.

Aperture area of collectors*)

247 m2 (3 × 82.3 m2)

Buffer storage

6 m3 (3 × 2 m3)

Hot tap water storage

6 m3

Total capacity of boilers with energy source

390 kW (3 × 130 kW) (natural gas)

Type of hot tap water heating


Type of heating system



Total cost solar system

250,000 Euro

Cost of the CSTS / gross area of collectors

1,011 Euro/m2


9 %


Output of solar heat**)

113,300 kWh/a

Reduction of final energy***)

161,875 kWh/a

CO2-emissions avoided

30 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:

"Studying the feasibility of renewable energy options is a standard procedure in renovation projects for WonenBreburg. In our experience the solar renovation of the hot water systems leads to higher comfort and better indoor climate without raising the housing costs."






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


Van Engelen Installatietechniek BV
De Beverspijken 15
5221 EE Den Bosch, Netherlands

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