Condensing gas boiler Varblok

15 models from 100 kW to 750 kW

  • Accessibility: width no more than 0.7m, maximum height 1.8m
  • Compact design: maximum floor surface area 0.8 m²
  • Stainless steel boiler
  • Modular design of boiler, with 1 to 3 modules
  • Operating pressure: 10 bar
  • Fume exhaust: flue (B23 and B23p)
  • Fuel: natural gas 20/25 or 300 mbar; propane

Standard supply

WR - VARBLOK is supplied with

  • Stainless steel firebox
  • Dual hydraulic connection
  • Adjustable gas burner, with full pre-mix, regulated between 20 and 100 % per module (up to 7% with 3 modules).
  • Ergonomic interface in clear text
  • Navistem B3000 regulator, including cascade management
  • Filter on combustion air intake
  • Outlet and intake temperature sensors on each module
  • Gas multi-bloc with air/gas ratio control, minimum gas pressure sensor
  • Active ionization flame control
  • Levelling feet
  • Natural gas supply at 20/25 mbar or 300 mbar – propane (37 mbar)
  • Varblok formed of 2 or 3 modules comes supplied as standard with: a fume kit; an OCI 345 interface for each module to manage the modules cascade; lifting rings to be fitted at each of the upper corners of each module for hoisting one at a time



Navistem B3000 controls system


Varblok benefits of the newest Navistem B3000 controls system.


  • Easy to install and economical: many integrated functions (cascade, V3V management, etc.)
  • Easy to use: interface in clear text, self-detection of sensors
  • Power demands optimisation: cascade strategies, timer and vacation programming
  • Boiler safety garantied: temperatures and flow rates monitoring, reduction of number of cycles

Standard supply

  • Display with backlit screen
  • User interface high visibility
  • 3 programmable relay outputs (1A max)
  • 2 dedicated sensor inputs
  • 2 programmable sensor inputs
  • 2 programmables digital inputs (1 possible at 0 to 10 Volts)
  • Inputs for room temperature sensors
  • Electrical protective devices integration (fuses, EMC filter)
  • Interface internal boiler wiring and external consumer wiring (LPB)
  • Mounting support


  • AVS 75 extension module for managing V3V circuit
  • OCI 345 interface for cascade boilers communicating via LPB
  • RVS 63 kit (external to boiler) to manage supplementary circuits
  • RVS 46 kit (external to boiler) to manage supplementary circuits 


Details & Warranty

Details & Warranty



  • Power supply 230 V 50 Hz
  • Maximum flow setpoint temperature 85° C


  • Heating element: 3 years warranty can be extended to 10 years
  • Electrical equipment + burner: 2 years