REGULA grandis 650 HK

The grandis 650 HK is a highly flexible heating and solar circuit controller for the control of complete heating systems.

Two integrated heating circuits (up to four when flex 400 extention modules are connected). Weather-compensated, mixed or unmixed, with automatic boiler demand.

Various pre-defined solar diagrams and integrated multi-function controllers for flexible system extension.

7 outputs 230V AC
  3 control outputs for HE pumps PWM o. 0-10V ana.
  1 potential-free output
  2 interfaces for Grundfos VFS and/or flow meter
  1 radiation sensor input

  10 temperature inputs PT1000
extendable to max. (with extension modules):
  19 outputs 230V AC
control outputs for HE pumps PWM o. 0-10V ana.
   6 interfaces for yield measurement

  26 temperature inputs PT1000

Available accessories:

  • Temperature sensor PT1000
  • Radiation sensor
  • Yield measurement set (incl. pipe sensor PT1000)
  • Grundfos VFS
  • Mains cables
  • Pump cables
  • Overvoltage protection box (additional overvoltage protection against lightning strikes)
  • Immersion sleeves
  • conexio web module for remote control and Remote visualization of controller data
  • convisopro (evaluation software)
  • Micro SD card
  • Extension module flex 400
  • Remote control unit navo 400


  • Comfortable and intuitive user interface with 4 menus for monitoring and controlling and 4 operating buttons
  • LED-backlit LCD graphic display
  • Micro SD-Card interface
  • Data logging (data storage)
  • System specific parameter setup (storage and loading of parameter sets)
  • Logging of settings and parameters
  • Firmware update
  • Prozeda Bus
  • Internet connection, remote visualization and remote maintenance (conexio 200 remote control unit)
  • Remote control (navo 400 remote control unit)
  • Up to 4 heating circuits - outside temperature controlled, with flexible heating curves settings. Allowance for building inertia and room temperature. Automatic boiler demand, hot water preparation
  • Suitable for use with modulating or on/off output heaters
  • Each heating circuit can be assigned to the inputs and outputs of an extension module flex 400
  • Time window with reduction, increase or OFF. Week overview and holiday switching
  • "Comfort operation" for the most important functions
  • Room control and remote operation (navo 400)
  • Up to three room sensors/room actuators per heating circuit
  • Screed heating
  • Cascade circuit
  • Mixer with 230V or analog actuation
  • Mixer or valve according to target temperature or supply line set point
  • Time programs, party and holiday modes
  • 15 pre-defined solar diagrams (can be switched off)
  • Intelligent pump speed control
  • Target temperature charging (heat source min. temperature)
  • External heat exchanger and bypass-function
  • "Parallel charging" function (for 2 or more storage tanks)
  • Solar radiation evaluation
  • "Storage tank priority" function
  • Storage tank with lower priority can be deactivated
  • Tube collector function with adjustable time slot
  • Drain-Back function, time and radiation controlled
  • Protection functions, such as system protection, collector protection, anti-freeze protection and flow monitoring
  • Storage tank cooling via heating circuit
  • Parameters remain consistant even after a power outage
  • Service and status messages with flashing symbols and acoustic warning signals
  • Energy yield measurement (flow sensor,vortex flow sensor, flow indicator)
  • Multi functional controllers with various pre-programmed controller functions