Successful tandem


Experts regard energy efficiency as the "sleeping giant" for the new energy era. But how do we wake it so that we use energy more consciously, transparently, sustainably and therefore more efficiently every day? And what does that cost?

If possible, energy efficiency should not cost more than it ultimately saves in consumption. A critical point particularly with regard to measures for the energy efficiency improvement of the building envelope. Here implementation sometimes involves substantial payback periods. ista has therefore focused on low-investment measures to boost energy efficiency which take effect where most energy is actually consumed: in buildings themselves, especially with respect to individual heating and hot water consumption. We create transparency of this consumption and therefore enable landlords and tenants to change their energy behaviour themselves.

Even the most efficient consumption behaviour loses sustainability if the heating system does not work properly.

Law with huge effect in the Netherlands

ista also checks the quality and performance of the central heating system in the cellar. For even the most efficient consumption behaviour loses sustainability if the heating system does not work properly. In the Netherlands, politicians have recognised this connection and have established appropriate mechanisms to consistently link consumption behaviour and heating performance: a new Heating Law, the so-called “Warmtewet”, came into force in the Netherlands in January 2014. Under this law, meters for the individual recording of consumption are to be installed in all multi-family buildings with a central heating system. Furthermore, the law caps the maximum amount which residents in multi-family buildings have to pay every year for their heating energy. The consumer advice centre defines a maximum price every year: for example, in 2014 it was EUR 254.00 for fixed costs and EUR 24.03 per gigajoule of energy consumed, including VAT.

So if the actual energy consumption of a resident exceeds the previously fixed maximum amount, it is not the tenant but the landlord who has to pay the additional costs. Therefore, the landlord has every interest in improving the overall efficiency of his building. With the Heating Check, ista Netherlands offers an interesting service which is already in great demand.

Heating check monitors efficiency

In addition to the individual heating cost bill, the team under Country Manager Jörg Plönissen measures and checks the efficiency of a heating system throughout an entire heating period. With gas heating, the gas meter is integrated into ista’s radio circuit by means of a pulsonic module. ista therefore not only records how energy consumption in the building is split up among the residents but, at the same time, how much primary energy is supplied in total to the building. Therefore, at the end of a billing period, the actual continuously measured efficiency of a heating system can be calculated from the delta of the heating energy supplied and used.

We expect the additional savings potential provided by the Heating Check to be roughly 10 %.

The results of this Heating Check are processed and explained for the landlord in a simple, clear and concise manner on the web portal. On this basis, the landlord can then get an installation company of his own choice to make tailored adjustments to the system. “The Heating Check goes hand-in-hand with our core business, individual heating cost billing,” Jörg Plönissen explains.


Jörg Plönissen
Country Manager, ista Netherlands


Established in: 1955
Business focus: Heat and water
Market share: almost 65%
No. of employees: 80
Branches: 1

Enabling change

Both are very reasonably priced processes for checking the actual energy consumption within a building for both landlords and tenants: through the actual performance of the heating system and through actual individual consumption in the building. “We expect the additional savings potential provided by the Heating Check to be roughly 10%,” Jörg Plönissen explains.

Thanks to very simple, easy-to-implement legislation, the Netherlands has succeeded in wakening the sleeping giant, energy efficiency. An exciting venture to which ista Netherlands gladly makes a contribution in the heat sector with smart, low-investment services for multi-family buildings.

Picture credits: grasundsterne, ista