The picture shows a woman sitting on a couch and reading the ista heating bill. She has long blonde hair and is wearing black glasses. Her top is a blue shirt and she is wearing brown trousers. While she holds the heating bill in her left hand, her right hand rests on her chin. She looks directly into the camera. The beige couch on which she is sitting stretches across the entire lower third of the picture and has a white blanket draped over the back on the left with a yellow cushion leaning against it. In the background are various pieces of furniture that suggest a living room: A floor lamp and a shelf can be seen on the right, and in the centre an open two-part door leading into another room with bookshelves. The entire background is blurred.
Smart heat cost allocation

One and done. We make heat billing simple, accurate and transparent.

Say goodbye to complex calculations and on-site visits. Our smart, all-in-one solutions takes care of everything.

Why choose smart heat cost allocation?

Be Compliant with Regulations

Be Energy Efficient & Cut Costs

Be Eco Friendly & Reduce CO₂ Footprint

Accurate & Transparent Individual Billing

No More On-Site Visits with Remote Metering

Your one-stop solution for heat billing.

Allocating heating costs doesn't have to be complicated. At least not anymore. Our intelligent heat allocation system provides accurate billing, ensuring fairness and compliance, while reducing disagreements and administrative workload.

We understand that accurate heat allocation is essential for all parties involved. By making tedious manual processes and on-site visits on-site visits a thing of the past, our automated system allows landlords to simplify their operations, while residents benefit from clear, fair bills that reflect their actual consumption.

Another factor that has added complexity to consumption-based and transparent heating cost billing in recent years is its growing legal requirement in many countries. One key regulation is Article 9c of the amended Energy Efficiency Directive (EED) 2012/27/EU, which mandates that newly installed meters and heating cost distributors must be remotely readable and sets deadlines for the retrofit of existing meters. At the national level, these regulations must be implemented into national law. Similar policies for heat billing are also being adopted in many countries outside the EU.

Simply put: With us, heating cost billing is done in minutes. Easy to understand for anyone. And encourages energy-saving habits.

We make compliant heat cost allocation transparent and easy. For everyone.

Residents

Gain control over your energy costs with real-time insights.

Landlords

Ensure compliance with laws and regulations and simplify your heat cost management.

Property Managers

Save time and increase operational efficiency for your properties with automated billing.

Housing Cooperatives

Benefit from automated collection and reporting of consumption data for rental units.

Faster & fairer. Upgrade to smarter heat billing with ista.

Ok, but how does it really work?

Heat cost allocation might seem complicated, but it's actually a well-structured and efficient process designed to ensure fairness for everyone.

New climate change legislation and energy regulations have made the process more complex and time-consuming for landlords, while residents continue to expect accurate and easy-to-understand bills.

Whether you’re a property owner, manager, or resident, our solution delivers the clarity, accuracy, and compliance you need. With smart technology and automated billing, you gain full transparency, saving both time and money. No more guesswork, no more disputes – just precise, automated billing.

Watch the video to learn how it all comes together – clear, accurate, and hassle-free!

Data-based heat cost allocation: How we turn a tedious process into a user-friendly experience.

Real-time monitoring & easy data access.

Exact heat cost allocation starts with precise consumption tracking. Smart metering devices, such as heat cost allocators and heat meters, automatically measure individual usage in each unit and wirelessly transmit data to a central system at regular intervals. This eliminates manual readings and ensures real-time accuracy.

All residents can easily access their consumption data through a user-friendly app or receive detailed reports by e-mail. This transparency not only helps them track their monthly usage but also identify potential savings—making heat billing simpler, fairer, and more efficient for everyone.

Fast, transparent, and compliant heat billing.

At the end of the billing period, the total heating costs are divided into fixed and consumption-based costs. Fixed costs, which typically account for 30-50% of the total, include maintenance, fuel and system operation. The remaining costs are allocated fairly based on actual consumption.

Once the data is processed, each unit receives an easy-to-understand and detailed bill that combines individual usage with shared fixed costs. Each bill is legally compliant, ensuring full transparency and allowing tenants and owners to easily understand their costs.

How it works inside the building:

Our system seamlessly integrates across multi-unit buildings, operating through two circuits: the primary circuit, which supplies heat to the entire building, and the secondary circuit, which distributes it within each individual apartment.

With a centralized energy source and smart heat meters, residents enjoy instant hot water and heating while only paying for what they actually use. The Data Collection Device (DCD) securely records and transmits heat consumption data to a cloud-based platform, enabling automated and transparent billing.

For added efficiency, the system is compatible with district heating networks, shared boiler systems, hybrid heating as well as underfloor heating and features a shut-off valve, allowing precise control over heat and hot water flow. This ensures maintenance can be performed smoothly, without disruptions to residents.

100% Easy

Find your solution with us.

100% Digital

Always and everywhere informed.

100% Sustainable

We give houses a future.

Good to know: The heating bill also enables accurate and transparent billing of hot water consumption. This gives residents a clear overview of their costs, while property managers and owners benefit from a simple and legally compliant overall solution. Our experts are happy to tailor all billing arrangements to your specific needs during a personal consultation.

Unlock efficiency: Our smart and future-proof devices.

By combining our one-stop solutions with the innovative technology in our appliances, managing your energy consumption has never been easier. Our wireless ista ecosystem integrates heat cost allocators, heat meters, and water meters to provide precise and reliable consumption tracking for each unit. Our experts are happy to advise you on the best combination of tools to optimise efficiency and savings.

The background is coloured in dark blue and on the right side is the heat cost allocator from ista depicted.

Heat Cost Allocator

Allocate heating costs fairly among residents.
The background is coloured in dark blue and on the right side is the heat-meter from ista depicted.

Heat Meter

The smart solution for wireless heating metering.
The background is coloured in dark blue and on the right side is the M-Bus from ista depicted.

Wired System (M-Bus)

Effortlessly monitor all meters.
The background is coloured in dark blue and on the right side is the radio system from ista depicted.

Wireless System (Radio)

Simplify your metering process.

MY ista

Your personal energy portal.
The picture shows a young man sitting at a white desk in his home, smiling and looking at his mobile phone and using the power metering service from ista. He is wearing a rust-brown corduroy shirt, a sand-brown shirt underneath and has black square glasses on. His hair is short and black and he has a short black beard. In front of him on the table is a laptop, next to it is a calculator, a ballpoint pen with a white sheet of paper and a white coffee cup. On the right side of the picture, directly next to the man, is a large monstera. The background is blurred, but a grey couch with brightly coloured cushions can be seen in the top left-hand corner and to the right of it is a orange and black wooden kitchen counter with two black bar stools.

Residents (Country specific)

The collected data is visualised in the EcoTrend app, allowing them to track their monthly consumption in real time, monitor usage trends and identify potential savings. This ensures full transparency and encourages more responsible energy use.

The picture shows a woman sitting peacefully on her couch and looking at her phone while smiling. background of the picture ist slightly blurred but you can still distinguish is a white modern kitchen with a white stone wall. On the stone wall are two simple shelves with food containers and to the right of them on the wall is an extractor bonnet. On the right-hand side of the picture, three wall cabinets can be seen, two of which have glass fronts. Underneath you can see a counter with two white chairs. On the counter is a vase with decorative flowers. In the foreground you can see the upper part of a light grey couch on which an elderly lady is sitting. She has a grey bob, black glasses and is wearing a blue shirt and light blue jeans. The lady is smiling at her mobile phone she is holding in her hand, with which she can easily and conveniently use ista's SmartPay option.

Owners and managers (Country specific)

Also benefit from our web portal, which allows them to manage all their property information centrally. With just a few clicks, invoices can be verified and legal requirements met.

Faster & fairer. Upgrade to smarter heat billing with ista.

Your Heat Cost Allocation just a few steps away.

From inquiry to implementation – our mission is to create smart, one-​stop solutions that make your life easier. We are here for our customers every step of the way and offer 24/7 customer support.

  1. Assessing and advising on measuring infrastructure: Our experts review your property's heating system and recommend the best metering solution for accurate and efficient heat cost allocation.

  2. Installing smart technology: Our advanced heat meters and wireless systems can be installed with a minimum of disruption.

  3. Transmitting consumption data: Automated data collection securely transfers real-​time usage information to a centralised system, eliminating the need for on-​site visits.

  4. Visualizing data on a digital platform: Residents and property managers can access clear, real-​time consumption information through an intuitive digital platform.

  5. Billing of consumption: Accurate and compliant billing is generated automatically, ensuring fair cost allocation and a problem-​free experience for all parties.

What sets us apart? Expertise you can trust!

With years of experience and a deep understanding of energy billing requirements, we set the industry standard for precision, reliability, and innovation.

3.7 mio. t
of CO₂ emissions avoided

60 million
devices

43 million
transmitting devices

68 years
of metering experience

14 million
apartments/commercial units

References and case studies

In the picture, a high stone wall can be seen in the background. The stones are quite small and have been arranged four times, two next to each other and two below each other, in such a way that they have formed several ovals. In front of this wall in the centre of the picture is a small tree in a dark pot. To the left of the tree are two men in dark suits talking about istas heat-contracting. The jacket of the man on the left is open, revealing his white T-shirt, and he is holding a document in his hands in front of his upper body. The man on the right, standing with his back to the plant, is carrying a black cloth bag in his left hand.

How a Dubai property cut heating costs by over €10,000 per year

Discover how a mixed-use property in Dubai optimised its heating system with intelligent heat cost allocation - reducing costs, increasing efficiency and ensuring fair billing for all residents.

In the picture, a high stone wall can be seen in the background. The stones are quite small and have been arranged four times, two next to each other and two below each other, in such a way that they have formed several ovals. In front of this wall in the centre of the picture is a small tree in a dark pot. To the left of the tree are two men in dark suits talking about istas heat-contracting. The jacket of the man on the left is open, revealing his white T-shirt, and he is holding a document in his hands in front of his upper body. The man on the right, standing with his back to the plant, is carrying a black cloth bag in his left hand.

How smart allocation drastically increased tenant satisfaction.

A London apartment complex redesigned its heating system and dramatically reduced tenant complaints by 80% through accurate and transparent billing.

Explore case

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Everything you need to download.

Noteworthy technology acquisitions 2021

PDF - 5 MB

Frequently asked questions

Discover more Innovative Solutions to Transform Your Property.

Our custom solutions are designed to help our clients reduce their environmental impact, improve health and safety in their buildings, and save energy costs.

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.

Heat Optimasation

Optimise heating systems for enhanced efficiency and savings.

The image depicts a man sitting at a round table in a well-lit office space. There is a glass of water and a small espresso cup on the table, adding to the professional yet comfortable atmosphere. The man is smiling and engaged with the water consumption billing from ista on his laptop, taking notes in a notebook. He is wearing a blue button-down shirt and glasses. The background features a flip chart, potted plants, modern furniture, and large windows allowing natural light to flood the room.

Water Billing

Save time and money with remote metering and transparent water billing solutions.

The Image shows a young man with a dark blue shirt, sitting relaxed on a table right by a window on the right side of the picture. He is smiling while looking outside, because with ista, his electricity billing is simplified and still precise, making it an effortless billing experience.

Electricity billing

Control electricity costs with precise billing, invoicing, and remote meter management.