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Accurate measurement and control of energy consumption are becoming increasingly important due to rising energy costs. Our advanced technology makes heat measurement effortless and highly accurate.
An innovative heat meter must do more than just measure consumption; it must also offer precision, reliability and future-proof technology. ista's advanced meters for heat or cooling deliver accurate results and feature state-of-the-art electronics, earning the trust of property managers and residents around the world. Whether you need a meter for new installations or for replacement within the prescribed calibration periods, our high-quality products developed in Germany are the right solution.
Equipped with advanced electronic measurement technology, the sensonic® 3 and sensonic® 3 calculator provide accurate, up-to-date measurements for a transparent and comprehensible breakdown of heating costs. The sensonic® 3 combines its well-known ease of installation with versatile application options and reliable measurement results, and stands out thanks to its compact design and advanced technology.
This heat meter is equipped with two external temperature sensors and can be easily mounted on all ista components with a single connection. Thanks to its compact size, it can be installed without any problems even under difficult conditions.
The compact version with integrated return temperature sensor is ideal for replacing existing meters. Thanks to the istameter principle and the proven 2-inch KOAX system, the replacement process is quick and easy.
The integrated, interoperable wireless interface of the sensonic® 3 enables accurate heat cost calculation and ensures that consumption data can be collected faster and more efficiently than ever before.
Measures very accurately, even the smallest consumption values
Approved throughout Europe in accordance with Directive 2014/32/EU and standard DIN EN 1434-6 for thermal energy meters
Complies with all EED requirements for measurement and distribution technology
Automatic meter reading on the end date and accurate billing
Transparent display of energy consumption
Innovative, highly integrated microchip technology (ASIC)
Easy interchangeability thanks to the istameter principle® and simple integration into existing smart building management systems
Our smart heat cost allocator is the perfect device for remotely recording and monitoring heat consumption in buildings with block heating. Together with consumption-based billing for each tenant, you can be sure that everyone only pays for their own consumption.
Our heat metering system uses advanced ultrasonic technology to ensure accurate measurement of heat consumption. Equipped with an integrated wireless interface, it enables remote data transfer and reading, eliminating the need for manual meter readings.
The system automatically transmits data at preset intervals, ensuring timely and accurate consumption recording. Designed for long-term reliability, the compact sensonic® 3 features an exceptionally durable battery, making it ideal for long-term, maintenance-free operation.
The meter integrates seamlessly into existing building infrastructures, effortlessly supports energy management and ensures compliance with European metering regulations.
ista offers solutions for virtually every application – from compact meters for heating and cooling in residential buildings to combined meters for large apartment complexes and commercial properties.
No measuring system is complete without the right calculation system! Whether for small or large volume flows, our calculation systems are designed to collect, analyse, present and send data to our central database, which we can easily read.
The battery-powered sensonic® 3 calculator is part of a heat meter that complies with EN1434. The sensonic 3 receives signals from the flow sensor and temperature sensors, guaranteeing accurate energy measurement.
The sensonic® 3 calculator can be combined with various flow sensors and temperature sensors in lengths of 3 and 10 metres and is available with pulse values of 1/25/250 litres per pulse.
With its high measurement accuracy, maintenance-free operation and long service life, the ultego® III smart helps to minimise annual operating costs. Two compact product series with various combination options offer versatile applications for heat measurement.
The ultego® III smart consists of an ultrasonic flow sensor, two temperature sensors and a calculator that determines energy consumption based on volume and temperature difference. Thanks to its integrated and interoperable wireless interface, the ultego® III smart integrates seamlessly into the ista wireless system, enabling fully automated and digital collection of consumption data.
Areas of application
With a flow range of 0.6 - 2.5 m³/h, the ultego® III smart is ideal for a variety of applications, including heating systems that use water as a heat transfer medium, transfer stations and larger heating systems in apartment buildings.
Key benefits
• Accurate, reliable and wear-free measurement
• Stable long-term performance
• Defined overload response
• Accurate measurement of even the smallest flow rates
• Insensitive to dirt and reliable measurement
• Extremely low energy consumption
• Low pressure loss
• Fast, intelligent temperature measurement
• Can be installed horizontally or vertically (ultego 3 smart can also be installed overhead and with a removable calculator)
• Measuring range Flow 1:100 according to EN 1434, total 1:1000
• Tamper-proof thanks to sealing
sensonic® 3 compact (dutch)
PDF - 207 KB
sensonic® 3 calculator (dutch)
PDF - 247 KB
sensonic® Temperature sensors (dutch)
PDF - 211 KB
sensonic® Toebehoren (dutch)
PDF - 227 KB
ultego® III smart plus (dutch)
PDF - 102 KB
ultrasonic flowsensor (dutch)
PDF - 207 KB
Heat meters measure heat consumption. Unlike heat cost allocators, they physically measure the nominal flow rate (heat quantity) of energy, which is why they are also referred to as heat quantity meters. The meter displays water consumption in cubic metres (m³) and heat consumption in kilowatt hours (kWh) or gigajoules (GJ).
Our modern measuring technology consists of:
Heat consumption is calculated based on the temperature difference between the supply and return pipes, with the resulting amount of heat expressed in kilowatt hours (kWh).
This calculation is performed continuously, allowing heat consumption to be accurately monitored during a billing period.
It is a physically exact unit of measurement. The display is on a roller counter or LCD display in kWh, mWh, G-Joule or G-Calorie.
Heat meters are installed in the pipe network, i.e. the water-carrying pipes, of a central heating system. These pipes transport the heated water produced by the central heating boiler or heat pump to the various heat emission systems, such as radiators, underfloor heating or convectors. The heat meter accurately measures heat consumption by recording the temperature difference and the flow rate of the water in the pipe network. This allows for precise recording of heat consumption.
The costs of the heat meter itself cannot usually be passed on separately to tenants as service costs. According to an important ruling by the Supreme Court (2022), heating installations such as heat meters and thermal energy storage systems are considered an integral part of the property (immovable appurtenance). As a result, investment and maintenance costs for these installations must be charged via the basic rent and may not be charged to the tenant as separate service costs.
If several homes or units are connected to a central hot water system, the Heat Act stipulates that consumption must be measured for each home. This can be done using a heat meter connected to the home.
A heat meter is required as soon as heat or hot tap water is supplied via a communal installation. This allows consumption to be divided fairly between households. Only if individual metering is technically impossible or financially unreasonable may an alternative such as heat cost allocators be used.
Heat meters have a statutory calibration period (usually 10 years). After that, they must be replaced or recalibrated. In addition, new meters must now be remotely readable. Older meters that are not must be replaced by 2027 at the latest.
No. The measuring systems from ista Netherlands are not smart meters.
ista meters record heat and water consumption over a specific period. Apart from consumption and any meter malfunctions, no other data can be read from the meter. Residents' privacy is guaranteed. We would also like to point out that devices such as phone chargers or computers have no influence whatsoever on the operation of the meters.
However, just like smart meters, the radio-controlled meters can be read remotely. This means that residents do not have to stay at home for the meter readings to be taken. This technology also allows residents to view their consumption during the heating season via the Monitoring service, the ista web portal and the ista app, and to adjust their heating behaviour if desired.
So when people talk about “smart meters”, they are never referring to the radio-readable meters from ista Netherlands.
