NTNU science building

Real gain for NTNU's science building - saves over 150,000 kWh annually

With the Apurgo M3 and heat pump, NTNU reduced the electricity consumption for heating tap water by 80 per cent – and took care of a troublesome problem.

With 60,000 m2, NTNU’s science building is one of Central Norway’s largest buildings. NTNU constantly struggled with Legionella in the pipe systems. The solution was to install Apurgo M3 , which ensured bacteria-free water, but also that the temperature of the tap water could be lowered from 70 to 50 degrees.

Five year pacback period

– In one year, we reduced energy use from 188,340 to 36,622 kWh, i.e. around 80 per cent. We calculated the payback time for the investment in Apurgo’s water treatment system and heat pumps to be approximately five years, says chief engineer Olav Høyem in NTNU’s section for Technical Operations.

NTNU Science building

Better effect on water pump

A lower temperature of the tap water gives a better effect from heat pump technology. Høyem and his colleagues also installed a water-to-water heat pump in the Science building.

– We are constantly looking for new and better ways to optimize the buildings. The aim is to run the university as profitably and environmentally friendly as possible, says Høyem, who has now also cut operating and maintenance costs with 24/7 remote monitoring and no longer needs cleaning with chlorine and 70 degree water.


  • NTNU uses Apurgo M3 water treatment plant to reduce electricity consumption and have safe water.
  • Apurgo monitors the Apurgo M3 the facilities every day – all year round.
Customer cases

No matter the building, our systems provide you
  • Lower electricity bill
  • Reduce hours of operation and maintenance
  • Immediate notification from our operational monitoring 24/7 if something happens
  • Longer lifetime of equipment and facilities

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