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Heat meter/ Cooling meter zelsius® C5 ISF

Electronic compact meter for heating or cooling energy with single-jet flow sensor (ISF) Optional interfaces: M-Bus, wireless M-Bus, LoRaWAN® and 3 inputs/outputs Nominal sizes: qp 0.6 /1.5 /2.5 m³/h

The new zelsius® C5 ISF with single-jet flow sensor combines efficiency with compact design, highest precision and most advanced communication interfaces for M-Bus, wireless M-Bus or LoRaWAN®.
Specially designed for consumption-based energy  billing, zelsius® C5 ISF is very well prepared to be used in all real estate with central heat supply:

  • Industrial and business buildings
  • Apartment buildings and residential complexes
  • Multi-family buildings

The advantages of zelsius® C5 ISF can be observed even by the installation. With its compact design zelsius “adapts” easily to nearly any installation situation.

The Combi version with removable calculator allows installation even in the smallest distribution boxes.
zelsius® C5 ISF can be easily operated via one single button. The application-oriented display offers an
optimum of readability and practical demonstration of relevant operating conditions.

Reliability and high dynamic range ensure optimal measurement results during the entire operating time.
zelsius® C5 ISF is a threaded meter, equipped with a rugged single-jet flow sensor (ISF) with reaction-free
electronic impeller detection, simple to replace and available in all common sizes.

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Product images

Heat Meter/ Cooling Meter zelsius® C5 ISF with Single-Jet Flow-sensor
Heat Meter/ Cooling Meter zelsius® C5 ISF with Single-Jet Flow-sensorHeat Meter/ Cooling Meter zelsius® C5 ISF with Single-Jet Flow-sensor


Heat meter/ Cooling meter zelsius® C5 ISF


  • Available as heat, cooling or combined heat/ cooling energy meter as well as glycol meter
  • Lowest design height
  • Optionally available with M-Bus or radio (wireless MBus) as well with 3 programmable inputs / outputs
  • For horizontal and vertical installation position
  • Stores monthly readings during the whole running time
  • Extensive maximal value storage of thermal output, flow rate and other parameters
  • Precise and long-term stable
  • Wide dynamic range

Product options

Measuring Principle
  • Single-Jet Meters
  • Electronic
  • Heating circuit up to 90 °C
Housing Material
  • Brass
Communication Technologies
  • Radio via LoRaWAN®
  • Radio via wireless M-Bus
  • optional 3 pulse inputs or outputs
  • Optical interface
  • M-Bus
Nominal Flow qp (Heat Meters)
  • qp = 0,6
  • qp = 1,5
  • qp = 2,5
Specified Units on Display
  • Cubic Meters (m³)
  • Degrees Celsius (°C)
  • Gigajoule (GJ)
  • Kilowatt hours (kWh)
  • Megawatt hours (MWh)


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