In the last years an increasing interest on the PV/T hybrid collector has been reported and some important international projects have been launched, like, to name a few:

1) The PV-HYBRID-PAS Joule project. The main goals of the project were the development of Procedures for Overall Performance and the evaluation of Hybrid Photovoltaic Building Components;

2) The PV Bonus negli USA;

3) Activity 2.5 TASK VII within IEA.

The joint implementation of the two technologies could favour both their markets by:

• sharing the experience of each market characteristics; the high tech aspect for the photovoltaics could add more reliability and trust to the solar collector and the already existing commercial sectors, surely more developed for the thermal collectors, could be exploited by the PV,

• the potential of a large costs reduction for the mounting, installation and manufacturing whether combined,

• the prevention and possible elimination of competition for the availability of the surface on the roofs for the buildings.

The history of that technology has showed that there have been different levels of integration:

1) at first the two systems have been kept separated, working in parallel, in symbol PV + T. With that configuration it has been difficult to realize the potential advantages;

2) then the systems have been combined and the two technologies have begun to match each other, symbolically PV&T. The Photovoltaics part is only added on the collector. Some benefits of the implementation have been gained;

3) the next pace is the integrated systems. The two parts are intimately joined and projected together so optimising the whole component, in symbol PV/T.

Some interesting aspects for the future development are listed below.

1) It is an added value for the building;

2) It could reach benefits following the boom for the building integration photovoltaics;

3) It is compatible with the thin film technology, particularly with the amorphous Si, that is more transparent to greater wavelengths and has more favourable temperature coefficients;

4) It fits well with the energy certification of buildings, compulsory for the next future;

5) It matches well to the new trends in the modern architecture (sustainability, compatibility, awareness)