Snyggatorpskolan is an elementary school in southern Sweden with 572 students and 48 teachers. The school has several different buildings that houses over 100 bathrooms, a gymnasium with showers and a kitchen that caters to nearby schools in the vicinity.
Installation of Altered Single Flow Dome nozzles and signage in 50 bathrooms over 2 buildings in August 2019. Evaluated buildings include the catering kitchen, classrooms and bathrooms. The gymnasium with showers was excluded from the project. The project has been evaluated through a comparison on total water use in the evaluated buildings over a period of 4 months.
Year on year comparisons on Total Water Use in the evaluated buildings have shown savings of between 30–44% with an average Total Savings of 38%.
The share of hot waterused in bathroom taps was estimated at 30%. This results in Energy and CO2 savings of 12,859 kwh and 7.6 tons of CO2 per year. Based on utility costs for water of 2.9 EUR/m3 and 0.22 EUR/kwh, direct ROI for the project was 2.4 months.
A positive side effect of the project was that water damage due to vandalization (i.e paper towels that are put in the sink with the faucet running to over-flow the bathroom) was reduced from 5-6 per term, to zero during the project period. These water damages normally incur a cost of EUR 3.000 –10.000 event. Taking these savings into account, the payback time for the project was less then a month, and total savings for 1 year is calculated to EUR 76.900.