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.
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.
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Find your solution with us.
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Always and everywhere informed.
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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.
Heat Cost Allocator
Allocate heating costs fairly among residents.
Heat Meter
The smart solution for wireless heating metering.
Wired System (M-Bus)
Effortlessly monitor all meters.
Wireless System (Radio)
Simplify your metering process.
MY ista
Your personal energy portal.

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.

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.
Accurate heat billing, made easy.
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.
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.
Installing smart technology
Our advanced heat meters and wireless systems can be installed with a minimum of disruption.
Transmitting consumption data
Automated data collection securely transfers real-time usage information to a centralised system, eliminating the need for on-site visits.
Visualizing data on a digital platform
Residents and property managers can access clear, real-time consumption information through an intuitive digital platform.
Billing of consumption
Accurate and compliant billing is generated automatically, ensuring fair cost allocation and a problem-free experience for all parties.
Facts & figures
6,300 employees
20 countries
3.7 mil. t CO₂ emissions avoided
43 mil. radio devices
14 mil. utilisation units
References and case studies
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.
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.
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Frequently asked questions
Our heat metering system uses advanced ultrasonic technology to measure heat consumption. These devices can send data wirelessly, so there's no need to check the meters in person. Data is sent automatically on set days, so you always have the latest information.
The compact, durable design includes a long-lasting battery, so it can be used for a long time without needing maintenance. These meters can be used with smart building systems to make it easy to manage energy use and meet European measurement directives.
Traditional billing splits heating costs equally among tenants, regardless of individual usage, often leading to unfair charges and disputes. Heat metering, on the other hand, tracks actual consumption, ensuring each unit pays only for the heat they use. This data-driven approach provides more control over energy use, increases cost transparency, and ensures a fairer distribution of heating expenses.
Heat metering requirements vary by region and are subject to local regulations. In many areas, heat network regulations require heating energy to be accurately metered and billed. Landlords and property managers are often responsible for ensuring compliance by installing the latest metering technology in new buildings or retrofitting in older properties.
ista provides consumption-based billing services that automate the process of heating cost allocation. Residents receive accurate and easy-to-understand bills based on their individual heat consumption. This approach ensures transparency and fairness, as tenants are billed precisely for the energy they use.
Yes, consumption-based billing can lead to energy savings. When residents are aware of their individual energy consumption, they are more likely to adopt energy-efficient behaviour, potentially reducing overall heating costs. Studies have shown that individual billing can lead to significant energy savings and reductions in CO2 emissions.
See insights from the study "Effects of Consumption-Based Billing Depending on the Energy Qualities of Buildings in the EU" by the Technical University of Dresden here.
The reaction to tenants who refuse to be metered depends on local legislation and the specific terms of the tenancy agreement. In regions where heat metering is mandatory, compliance is usually required and landlords may need to enforce metering to comply. It's advisable to consult local guidelines and seek legal advice to deal with such situations appropriately.
Residents can monitor their energy consumption through ista's personalised energy portal, MY ista. This platform allows users to easily view their consumption data, account details and pay bills from one convenient location, providing full transparency and control over energy usage.
Yes, ista's heat metering solutions are compatible with a range of heating systems, including those using renewable energy sources such as solar thermal and heat pumps. This versatility ensures that properties using sustainable energy solutions can still benefit from accurate heat metering and fair billing practices.
All metering data is protected under GDPR and regional data protection laws. Specify content according to country
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