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Pay what you use.

Accurate and easy made heat cost allocation.

Digital consumption-based billing with ista optimises and automates the process of heating cost billing and provides residents with accurate bills.

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Join the future.

Maximise efficiency in water consumption billing.

Automated water sub-metering, billing, and data analysis, which can help you to optimise water usage and reduce costs for your property.

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The picture shows a corner of a housing estate with white modern apartment buildings stretching from left to right across the picture. The buildings are characterised by an unusual architecture, as they alternately have protruding cubes with either large windows throughout the whole cube or set in balconies. The skyblue sky is filled with a few white clouds on the right side of the picture and in the foreground are red hedges and small trees that have been planted around the buildings, marking the property of the apartment buildings. There is a paved pedestrian path along the hedges and this is also bordered by another green hedge. The pedestrian path runs in a half circle in the bottom right of the picture, making a way through the grass that is planted there.

With all our energy.

We give buildings a future.

Smart solutions for consumption transparency and CO₂ savings makes it more easy to get a future-proof property easier as you can imagine.

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Benefit from proven services for residential real estate.

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Heat Cost Allocation

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Water Billing

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Heating Optimisation

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Operating Cost Billing

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The picture shows a modern residential complex with several white, multi-storey residential buildings standing on the left and right side of a paved path. The buildings have balconies with dark railings, and some balconies are decorated with plants and furniture. A wide, paved footpath stretches between the buildings and continues into the distance. On the left side of the path are lush green areas and colourful flowerbeds that embellish the space between the buildings. On the right-hand side of the path, young trees are planted at regular intervals, forming a green avenue together with manicured lawns. Other buildings can be seen in the background, completing the urban surroundings of the residential complex. The sky is clear and blue, indicating a sunny day. Overall, the picture conveys a calm and pleasant living atmosphere in a modern, well-maintained environment.

Profit from AI-Intelligence.

Savings in heating of up to 30 % and zero investment.

Our smart AI-powered control system is easily integrate into most existing heating architectures and pro-actively regulates heating output to meet the actual heat demand of the building.

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Catch Up on ista´s latest developments and successes.

The latest project got a lot success.

Explain here the key points that made the project so successful and encourage you to read on.

Our offer to provide a better service.

We found out your problems and did something to help you easily.

The picture shows a residential complex in the centre, stretching from the left to the right edge of the picture. The various buildings look very similar on the outside and have a white-orange brick façade. The individual flats have balconies with glass railings. The balconies are separated from each other by frosted glass walls and are furnished differently, giving each flat an individual touch. Most of the visible buildings have four floors, but vary in width so that different numbers of flats are visible on each floor. In the right quarter of the picture, in contrast to the others, another building rises up, which has the same style as the other buildings in the residential complex. A park can be seen in front of the residential complex in the lower half of the picture. Grasses and bushes surround the residential complex, accompanied by a pavement adorned with scattered trees. There are also benches and lanterns on the pavement. An artificial pond can be seen in the bottom left-hand corner, surrounded by a wooden walkway with glass railings. The sunset can be seen on the right-hand edge of the picture, giving the sky a slight colour gradient, from a reddish tone on the right to a bluish tone on the left.

Experience our latest technology.

The new device makes you happier than you have ever been with others.

We offer users personal support.

It's difficult to navigate or be in these times, with lots of regulations, we just did it.

Get in touch with us. We are your expert and trusted partner in energy solutions for residential real estates.

Talk to our team of experts and discover how our innovative solutions will transform your properties. Our strength lies in our personalised service, backed up by our market-leading portals, giving our customers 24/7 access to their energy data, on one bespoke platform.

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Your success, our priority.

Our customer-oriented commitment: With ista, you work with reliable experts in energy management who help you to save costs and increase efficiency. With ista, you have access to state-of-the-art technology and innovative solutions that future-proof your energy needs.

Reliable Partner

As a partner that has proven itself for more than six decades, we stand for reliability and trust in every collaboration.

Sustainable Solutions

We are specialized in designing and retrofitting buildings to be energy-efficient and future-proof.

Seamless Services

From expert energy advice to smooth installation, ongoing maintenance and billing.

Secure Technology

The most advanced software and hardware, adapted easily to your energy requirements and systems.