With rising energy costs and growing regulatory demands, precise consumption data is crucial for managing expenses and optimising performance. ista’s hybrid meters deliver accurate, automated heat and cooling measurement for transparent reporting, efficient energy management, and full compliance across multi-unit commercial and industrial properties.
ista’s hybrid meters are a reliable choice for companies and building operators looking to optimise energy performance and control costs across multiple sites.
Designed to measure both heat and cooling energy with exceptional accuracy, they provide robust real-time data for transparent consumption-based cost allocation, in line with Italian and EU efficiency regulations. By combining heating and cooling measurement in one certified device, installation effort is reduced, system architecture is simplified, and total lifecycle costs are lowered.
With integrated remote reading, minimal maintenance and seamless system integration, our hybrid meters deliver scalable efficiency, helping businesses to monitor performance, streamline administration and support their sustainability goals.
Thanks to its modern electronic measurement technology, sensonic® 3 provides accurate and timely readings, making cost billing transparent and easy to understand. The proven ista meter principle also offers unrivalled flexibility when replacing meters.
The compact Ultego® III smart ultrasonic heat meter combines a calculator, flow sensor and temperature sensor in one convenient device. With two external sensors, it meets all the requirements of the new European Measuring Instruments Directive and provides accurate, reliable readings.
Ultrasonic technology enables precise measurement of water flow rates
Autonomous operation with a battery life of 10 years
Stores data from the last 24 months, ensuring comprehensive consumption tracking
Low consumption values can be measured, making it suitable for energy-efficient buildings
The remote readout function enables convenient data access without on-site readings
Compatible with pulse, AMM, and M-Bus modules
Seamless installation and low-maintenance operation
ista’s hybrid meters are ideal for comercial properties where individual units are heated and cooled via a water circuit. They ensure fair, consumption-based cost allocation and simplify maintenance, while improving everyday energy management efficiency.
Our hybrid meters combine advanced sensor and microchip technology to measure heat and cooling energy with exceptional precision. The sensonic 3 and Ultego III models feature ultrasonic transducers and external temperature sensors that continuously monitor flow and temperature values. This data is processed in real time and displayed on a clear LCD screen, ensuring transparent and accurate readings at all times.The compact versions have been specially developed for use in residential buildings and are adapted to different flow rates, with nominal flow rates of 0.6/1.5 and 2.5 m³/h.
The meters automatically switch between heating and cooling modes based on temperature differences, providing year-round reliability without the need for manual adjustments. Their robust, tamper-proof design and smart connectivity make them easy to integrate into existing building systems, eliminating the need for additional heating and cooling meters and significantly reducing equipment and installation costs.
The hybrid meter continuously records the temperature difference between the supply and return lines at 60-second intervals while taking an energy measurement. Based on this data, the device automatically switches between heating and cooling modes.
Heat measurement begins when the temperature difference is greater than 0 Kelvin and the supply temperature exceeds 20 °C. Conversely, the meter switches to cooling mode as soon as the supply water is cooler than the return water, i.e. when the temperature difference is negative and the supply temperature falls below 20 °C.
An integrated electronic microchip (ASIC) then uses the measured values and specific constants for the circulating fluid (K factor) to calculate the consumed energy. The result is displayed in real time on the easy-to-read LCD screen.
In Italy, the installation of remotely readable meters is not only a matter of convenience — it is also a legal requirement.
Following the implementation of the EU Energy Efficiency Directive (EED) through Legislative Decrees 102/2014 and 73/2020, all heat and cooling meters installed in multi-unit buildings must support remote reading. Existing devices must be upgraded or replaced by 1 January 2027 to ensure full compliance.
ista’s hybrid meters already meet these obligations. With built-in wireless interfaces and compatibility with M-Bus, AMM and IoT networks, they enable automatic data transmission for accurate consumption-based billing, simplified administration and compliance with Italian and EU energy efficiency regulations.
A hybrid meter is a certified device that measures both heating and cooling energy in one unit. It automatically switches between the two modes, depending on temperature flow, ensuring accurate data year-round for transparent, consumption-based billing.
No. ista’s hybrid meters are compact and easy to install. Certified technicians complete the setup quickly and with minimal impact on daily life. Once installed, readings are taken remotely, no more on-site visits required.
The meters automatically transmit consumption data via secure wireless communication modules (pulse, AMM, or M-Bus). This allows administrators and residents to access real-time information through ista’s online portal and app.
Yes. ista’s hybrid meters meet the requirements of Legislative Decrees 102/2014 and 73/2020, which implement the EU Energy Efficiency Directive in Italy. They are also fully certified under MID 2014/32/EU and EN 1434 standards for thermal energy measurement.
The hybrid meters are designed for long-term precision with minimal maintenance. Automatic functionality checks and remote monitoring ensure reliability. Recalibration or replacement follows legal verification intervals, as required by measurement standards.
Only authorised users, such as business owner or property administrators, and ista’s service team, can access consumption data via secure login. All data is processed in compliance with GDPR and Italian privacy laws.
