Modvlvs Energy Pump Units

The pump units ‘Modvlvs Energy’ are utilised to meter energy in centralised heating and cooling installations.  These pump units, with two isolating valves on the return, allow for easy installation of the energy meter.  The second temperature sensor is directly put into the isolating valve on the flow, without any pocket.  This special 3-way ball valve, placed after the circulating pump, allows the sealing of the sensor and also the replacement of it without draining the installation; it is sufficient enough to close the valve to isolate the sensor from the hydraulic circuit. 


G21 Energy Meter suitable for heating and cooling

Compact energy meter, with storage of 18 monthly remote values, and storage of a years data (starting from the reference day). Digital interface for programming and/or reading and connection of an external communication module.  MID approved.

3/4” x 110mm | Code: G21MID20
1” x 130mm | Code:G21MID25

  • Flow metering by means of turbine single jet volumetric system with monitoring of the number of turns in accordance with the electric conductance principle, so without the use of magnets
  • With the digital display, additional modules for the communication via radio or M-Bus can be connected at any time, and also the impulse output or RS-232
  • PT1000 temperatures sensors 5x45mm, 1.5m long
  • MID approved and lithium buffer battery 10 years life
  • Available nominal flows: 1.5 m3/h = DN15 – (Kvs 3.0) and 2.5 m3/h – DN20 – (Kvs 5.0)
  • Data reading by means of seven-figure LCD display with button on the front of device.
  • The supplied data is split into 5 levels: energy value, volume flow, actual flow and temperature values, technical parameters, monthly consumption of the last 18 months at the day of reference, etc.


M2 Energy – 2 way unmixed pump unit made for the fitting of an energy meter

The unit for 1” (180mm) circulating pumps consists of:

DN15 | Code: 20351820
DN25 | Code: 20351825 


  • Ball valve with T handle
  • Circulating pump
  • 3-way ball valve supplied with in-handle thermometer (coded red, range 0oC – 120oC). The third way M10x1 allows the fitting and the sealing of a 5x45mm sensor.


  • Ball valve with non return valve 20 mbar (which can be excluded by rotating the handle by 45°) supplied with in-handle thermometer (coded blue; 0°C-120°C).
  • Ball valve DN20 with T handle


  • For power up to 50 kW and maximum flow 2150 l/h.
  • Kvs Value: 8,0.*
  • Approximate data calculated with a 6 m nominal lifting power circulating pump.

(*) The data is relevant to the pump without energy meter installed.

For sizing please refer to Radiant Control Ltd.