Heating energy meters | Bola Systems

Clamp on heat meters are now widely used in the industrial and building sectors for monitoring hot water systems and energy efficiency monitoring. The simplicity and reliability of clamp on heat meters have seen their widespread adoption throughout the world as an accurate and reliable method of quantifying heat energy consumption. Clamp on heat meters can be used on any pipe size or material, are non-invasive and therefore not prone to the levels of deterioration that are seen by normal intrusive heat meters.

Permanent Heat Meters

RS Hydro supply a range of clamp on heat meters for energy monitoring applications: cooling or heating. Users can have either integrated heat meters with only one transmitter or choose the most preferred flow meter with a suitable output for the heat calculator. RS Hydro offer clamp on temperature sensors or insertion sensors installed using pockets.

Portable Heat Meters

RS Hydro maintain the largest fleet of rental portable clamp on ultrasonic flow meters in the UK. The PT878 flowmeters have integral energy calculators with connections for clamp on temperature sensors. The PT878GC clamp on gas flow meters can also measure mass flow. RS Hydro both the PT878 heat meters and PT878GC clamp on gas flowmeters.

Heat Meters for Monitoring Heat Transferred to or Lost within a System

By attaching two temperature sensors (PT100) to the flow meter and establishing the density and specific heat capacity of the liquid, it is possible to establish the heat flow between the inlet and outlet. Our clamp on heat meters help energy managers to not only establish total energy consumption but also to create heat balances and isolate individual energy consumers within large factories or buildings. By using a portable flowmeter it is possible to undertake comprehensive energy surveys quickly and efficiently. Permanent non intrusive heat meters can also be installed at any suitable location.

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Calculating Temperature Differential

In its simplest form, the heat consumption is proportional to the temperature change between the two attached temperature sensors. To calculate the exact heat flow, the specific enthalpy and density of the liquid need to be known. However, some liquids are non-compressible and as such any variations due to large-scale changes in pressure are neglible. Our heat meters consist of two 24v active inputs which can be used to measure the temperature differential. Available ultrasonic transducers and temperature sensors allow flow measurement and heat balances to be conducted over the -100 to +250 degrees C range.

Calculating Flow Rates

Due to their accuracy, reliability and flexibility, the ultrasonic flow meter is the preferred method for establishing in-situ flowrates. With an integrated wall thickness gauge and specialist pipe diameter tape measure it is possible to establish the exact external diameter and pipe wall thickness of the pipe work. Once the internal diameter is established and using ultrasonic theory the two attached ultrasonic flow transducers can be used to establish the differential transit time of the fluid. The transit time is proportional to the liquid velocity.

Calculating Heat Consumption

By establishing the temperature differential, in-situ flowrates and the coefficients it is possible to calculate the heat quantity. The integrated datalogger can record 100,000 data points which can incorporate any measurand, diagnostic parameter or signal input. All data is recorded in non-volatile memory and as such will not be lost due to a lack of power. The integrated battery can power the flowmeter for up to 8 hours and up to 7 days with an external battery.


Common applications including energy consumption surveys in large multi-building complexes, factories and plant such as hospitals, car plants and office buildings. Smaller applications include pump testing and small scale energy consumption surveys.

Heating energy meters

Heating costs have been increasing year by year. It is therefore in the interest of every property owner to focus on reducing heatin energy consumption. After all, the measurement of energy used on heating is in some cases even stipulated by law. Heat meters will serve this purpose well, which significantly simplifies the entire process of data collection and calculations of consumption.

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What are heat meters?

Heating cost meters are intelligent electronic devices that are used to measure the amount of thermal energy used by individual units in residential buildings. They are installed directly on the radiators or on the return pipe of the radiator outlet.

How to choose a suitable meter?

It should be noted that there are several types of technical solutions based on different principles of measurement. For industrial and more demanding applications, we recommend an ultrasonic meter.

An electronic meter is sufficient for residential houses, in which the water flow is directed tangentially to the impeller. The speed of rotation is measured electronically without the use of a magnetic field. The choice also depends on the dimension of the pipe and also on the flow.

Electronic and ultrasonic meters are further divided according to the method of reading into meters with visual reading and meters with radio reading.

Meters with visual reading


Total value of energy consumed is displayed directly on the meter display. The advantages are low price and long battery life. On the contrary, one of the main shortcomings is the need to make the meter accessible during the reading.

The Siemens UH 50 meter is an ultrasonic meter which, without suitable accessories, serves as a meter with a visual reading. For the possibility of radio reading it is necessary to buy an M-Bus module, a Radio module or an Analog module.

Meters with radio reading and one-way communication 868 Mhz Wireless M-Bus

These meters are equipped with a radio transmitter module and consumption values can be read remotely without the need to enter the property. For one-way communication, the meter transmits data continuously during the set reading period.


From meters with one-way communication, we recommend the ENBRA Sharky 774 meter, which is used to measure the amount of heat in closed heating and cooling systems. It is equipped with Wireless M-Bus / OMS communication interface or wired M-Bus communication. The set includes a heat meter, a pair of fittings, a pair of seals, and a ball valve with a thermowell.

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Meters with radio reading and two-way communication 433 Mhz SuperCom

Meters with two-way communication contain both a transmitter and a receiver. Therefore, the data is transmitted only on demand.

There are three ways of radio readings:

  1. Walk-By – used mainly for reading meters in buildings. The worker carries a reading device consisting of a modem (receiver) and a terminal (portable PC, tablet or mobile phone). He walks through the common areas inside or outside the building and takes a reading, without having to enter the individual homes.
  2. Проезжая мимо – reading from a standing or slow-moving car. It is mainly used for reading meters that are installed on the bases of buildings or in shafts.
  3. AMR – reading via radio nodes usually installed in buildings. The nodes read, usually via Wireless M-Bus, data from meters. The nodes are connected to a server, which collect data and make them available for processing. Part of this system is the so-called portal solution, which allows data to be displayed to individual users and administrators via the Internet (based on assigned rights).

ENBRA meters are supplied with fittings, seals and thermowells. These accessories must be purchased separately for Siemens meters.

Accessories for Siemens meters can be found here.

Cooling energy meters

Both Siemens and ENBRA meters can also be used to measure cold. Cool meters are devices similar to heat meters, they work on the same principle, only with a different temperature range. They are installed next to air conditioning units, for calculating the consumed cold.

The requirement for a cool meter or combined heat / cool meter must be specified to order so that the manufacturer can enter the parameters from the factory.

Calibration of energy meters

Every energy meter used for cost calculations must be verified by one of the authorized metrology centers. Check your local authorisations for more information.

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