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Heat and cold meters measure energy consumption at individual consumption points, allowing for fair cost allocation. Their installation is legally required in all buildings with multiple owners or tenants. Find out how to select and install meters.
Heat and cold meters are divided into ultrasonic and mechanical based on the measurement method. Mechanical heat meters are cheaper but also less accurate and have a shorter lifespan. Ultrasonic heat meters, especially top-of-the-line Siemens heat meters, are much more accurate and reliable. Because they have no mechanically stressed parts, they also have a longer lifespan.
You can find more information about individual types in our articles on heat and cold meters.
We have prepared a list of key criteria that you should consider when selecting:
Heat meters are classified into accuracy classes 1, 2, and 3. While smaller apartment buildings have lower accuracy requirements for heat measurement (class 3), in some applications, such as certain industrial sectors, precise heat meters (classes 1 and 2) are essential.
Ultrasonic heat meters Siemens represent the pinnacle of the market
The temperature range is important to determine based on whether the meters will measure heat or cold. There are also so-called combined meters available on the market, which measure both heat and cold in one device.
Meters must, of course, be compatible with existing systems in the building. Focus on the type and size of the connection, construction length, type of medium, and flow rate. The meter must also match the surrounding environment – each model is suitable for a certain temperature and has different IP protection.
In simpler models, manual reading is performed, i.e., transcribing data from the meter display. More advanced models can be equipped with a remote meter reading module via walk-by, from a vehicle, or using radio nodes. Heat meters with remote reading can be integrated into building automation systems, where data is automatically loaded into a central server.
Although more expensive models offer advantages such as higher reliability and user-friendliness, in many applications, basic meters will suffice. Therefore, carefully consider the investment and its return before selecting.
Electronic Heat Meter ENBRA
Heat and cold meters can only be installed by a person authorized by the Czech Metrology Institute.
First, it is necessary to check the compatibility of the meter with the piping and select a suitable location for the meters, considering the surrounding conditions (e.g., maximum allowable temperature and humidity of the environment), type of piping (horizontal, vertical descending, or vertical ascending), and also access for maintenance and reading purposes. The evaluation unit is either part of the flow measurement section or connected to it by a cable – in that case, it can be mounted on a wall bracket for easier reading.
In the case of electronic meters, it is necessary to have sufficient calming length of piping before and after the installation site. Before installation, it is advisable to flush the piping.
Meters are usually installed in the return line, always only in the position allowed by the manufacturer (horizontal/vertical) and in the direction of the heat transfer fluid flow, which is indicated by an arrow on the meter. The flow measurement section is installed between two ball valves. In the case of electronic meters, water contamination can reduce measurement accuracy, so we recommend installing a filter before the flow measurement section.
Temperature sensors must be in the same circuit as the flow measurement section. They can be either integrated into the flow measurement section or separate – these are installed using a mounting kit into T-pieces, ball valves, immersion sleeves, or as directly immersed.
If the meter includes a communication module, simply attach and screw it onto the meter according to the model instructions. The communication module and the meter itself are then set up using service software. The meter is put into operation by opening the shut-off valves.
After installation and commissioning, ensure that all connections are sealed and the system is vented. The final step is to protect all components against unauthorized tampering. Sealing is required for the fittings, flow measurement section, temperature sensors, and evaluation unit with the communication module.
Heat and cold meters require no maintenance, and any malfunction will be indicated by an error message. Meters must comply with the DIN EN 1434-1:2023-03 standard.
All heat meters must, according to current legislation, have verification by the Czech Metrology Institute (ČMI) or one of the authorized metrology centers, and calibration verification. Decree No. 127/2024 Coll. extended the period for the revision of heat and cold meters from 4 to 5 years. The period is always counted from January 1 of the year following the verification.
Instruments must not be handled unprofessionally. If these conditions are not met, the consumer may question the measured deliveries.
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