Year-on-year calculations of Total Water Use in the University have estimated savings of 600.000 liter of water and 6,000 kWh of energy each year. The share of hot water used in bathroom taps was estimated at 30%. This results in CO2 savings of 301 Kg per year. Based on utility costs for the water at 2 EUR/m3 and 0.20 EUR/kWh, the direct ROI for the project was 12 months.
Taking these savings into account, the payback time for the project was less than a year, and the total savings on the water and electricity bills are calculated to be EUR 2.500 each year.