Bulletin 83: Heat Meters

With the increasing cost of energy and an emphasis on energy reduction, accurate and reliable metering of all utilities has become necessary for measuring and managing energy costs.

Heat meters provide the metering of heating and/or cooling energy in hydronic systems based on volume, supply and return temperatures. HMM/H models are for the metering of heating systems, HMM/HC models are for cooling or heat/cool systems. Various thread sizes and respective ball valves and tailpieces facilitate the installation of the meters and allow them to be used in a wide range of installations. Used in conjunction with an RS232 M-bus convertor and a Trend IQ3/XNC M-Bus driver, the meter’s data can be accessed over the Trend network.

The Trend heat-meters are part of a package of energy solutions aimed to provide practical and reliable solutions for energy management across all non-residential properties and estates as well as for community district heating programmes. They are also suitable for fiscal billing applications as they are certified with the appropriate requirements of the EN 1434 European standard for thermal energy metering and the Measuring Instruments Directive (MID).

Key Benefit

The ability to read the meters remotely, negates the need to visit the individual locations and collect readings manually saving time and resource.


  • Electronic sensor control for recording flow rate
  • Available in nominal flow rates from 0.6 to 10 m3/h
  • DN15 and DN20 meter versions with direct electronic impeller scanning
  • DN25 and DN40 meter versions with magnetic coupling for electronic scanning of sensor disc
  • 10 year battery life
  • Primary interface: M-Bus interface to EN1434-3
  • Optical ZVEI interface to IEC 870-5
  • Adjustable reading date for billing
  • Windows-based HYDRO-SET software for optimum adaption to user-specific requirements