The planning of installations for the use of renewable sources (biomass, solar energy, geothermics and rain water) for residential and commercial buildings and public utilities is becoming increasingly an interesting alternative to counter the continuously rising costs of energy and water.

The optimum solution for every building scheme can be found by efficiency calculations, system analyses and advice on the acquisition of allowances.

Utilisation of grey water and reduction of overheads Jena - Friedensberg (2003/4) 135 apartments