Hot Water Heating


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ENVI Boiler Control System

Designed to maximize efficiency, our ENVI boiler control system monitors and modulates the combustion and ignition of the boiler to maintain the desired outlet temperature.

This flexible boiler control system can run a single boiler or a master/member network of up to 16 boilers. The lead/lag setup and boiler start rotation ensures run times are equally distributed across each unit in the system, extending the life of the boilers.

The ENVI boiler control is an on-board control system, eliminating the need for external control panels and reducing ancillary component costs. Control both condensing and non-condensing boilers in a hybrid system for maximum efficiency at minimum cost.



  • Combination combustion and temperature control
  • 9 comfort heat modes
  • Text-based display
  • 3 domestic hot water modes
  • MODBUS® RS-485 communication protocol
  • Cascade sequence up to 16 boilers
  • 0-10VDC analog input


  • Standard integrated control on P-K MACH condensing and P-K MODU-FIRE forced draft boilers
  • Fault descriptions in plain English include boiler status at the time the alarm occurred
  • User friendly text-based display makes programming easy
  • Individually annunciated limit switches make troubleshooting quicker and easier
  • Automatic set point adjustment based on user defined outdoor air reset curve
  • Built-in cascade function allows sequencing of up to 16 boilers
  • Use the same boiler or network of boilers to deliver domestic hot water as a priority over space heating
  • Communicate with building management systems using MODBUS RS-485 protocol or 0-10 VDC analog input
  • Automatic set point adjustment for night setback

*MODBUS is a registered trademark owned by Schneider Automation Inc.




For more information about this or any of our other products, please contact us or click here to find your authorized Harsco Industrial Patterson-Kelley representative.


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