A Working Lab · Sven Hultins plats 5
Less water.
Lower energy use.
At A Working Lab, Akademiska Hus and Vyse tech are testing local water heating with lower flow rates. Ten installed units provide data on usage and the potential to reduce water and energy demand.
A pilot to learn from together10 installed unitsNozzles rated at 1.3 or 1.9 l/minOngoing pilot with data collection
Ongoing pilot · collecting data since summer 2026The summary is updated weekly. This page automatically checks for newly published figures.
Data period 2026-05-20 – 2026-09-14 · Last data retrieval 2026-09-14.
Same usage · lower flow
The difference in water volume.
Before and after are calculated for the same time per handwash in the pilot data.
71.4 %less water
Estimated savingsRemaining volume
Potential for all of A Working Lab · 47 washbasins
91.7% lower energy demand
A calculation for the entire building indicates potential savings of 27 MWh per year with a complete replacement.
How we calculate · pipe losses and assumptions
The model assumes a complete replacement of the building's 47 washbasins, with 1.3 l/min at every washbasin. It represents future system potential, not measured annual savings from the ten pilot units, which use both 1.3 and 1.9 l/min nozzles.
The calculation assumes 600 people, three washes per person per working day, 260 days per year and 10 seconds of water flow per wash. Water volume is 429 m³ before and 101.4 m³ after. Temperatures: cold water 15 °C, mixed water 35 °C, hot water 54.5 °C. Local heat loss in the Vyse tech heater: 3%.
The previous system includes pipe cooldown, heat loss from hot-water and circulation pipes, and pump electricity. The model assumes that water in the branch pipes cools between uses and that the distribution system can be decommissioned. For the pilot's usage, the comparison excluding distribution still gives 70.5% lower energy demand.
Price assumptions in the calculation: district heat SEK 0.81/kWh · electricity SEK 0.71/kWh · water SEK 30/m³. Current tariffs need confirmation. Investment and servicing are excluded from operating savings.Voices from the pilot
What do users think?
From the user survey“A slightly lower flow than you are used to. But it actually wasn't a problem.”
“Much better than I expected. I thought that the low water flow would be annoying but it was not.”
“The water has perfect hand washing temperature.”
Comments from the pilot's user survey. Translations and excerpts are identified below each quote.
Lower flow makes a difference
Lower flow reduces both water volume and the amount of water that needs heating, every time the tap is used.
Insights for more properties
The pilot tracks everyday use. More detailed session data will enable better comparisons of energy, temperature and comfort, helping inform potential installations at other properties.
Your property could be next
Could this work in your property?
Talk to Andreas about the experience at A Working Lab, or to Simon about the solution and opportunities to try it at other Akademiska Hus properties.
+46 72 201 71 06
+46 70 924 15 31