XVers Condensing Boilers, 856-3006

The XVers vertical fire-tube modulating condensing stainless steel boiler, in sizes 855 to 3000 MBTU. The XVers boiler is now available with the HO2T system. It features built-in, automatic system protection that extends the life of your XVers by maintaining the optimum fuel to air ratio. The XVers provides extreme versatility for boiler applications, with cutting-edge control technology, broad installation flexibility, easy commissioning, optimum seasonal efficiency, and long-term reliability.


  • HO2T System
  • Stainless Steel Vertical Fire Tube Construction
  • Up to 96.2% thermal efficiency at full rate; Up to 99% at part load
  • 100% factory fire tested
  • VERSA IC® modulating controller
  • Full electronic modulation
  • 7 Inch HD capacitive color touchscreen display
  • Full safety diagnostics with history
  • Status display lights
  • Cascade control of up to 8 units, no external sequencer required.
  • Cascade in parallel or sequential modulation modes.
  • Flow sensor
  • Flow switch
  • Low water cut off
  • Modbus RTU BMS port
  • Maximum outlet water temperature: 200°F
  • Minimum inlet water temperature: 40°F
  • Models 856-2006 comply with SCAQMD rule 1146.2 
  • Limited twenty-five-year thermal shock warranty
  • Limited ten-year heat exchanger warranty
  • B-32 Outdoor air sensor 


  • C – 10 HO2T System
  • S-1 Low gas pressure switch, manual reset
  • S-2 High gas pressure switch, manual reset
  • C-6 Single-try ignition
  • D-11 Centrotherm polypropylene outdoor vent kit
  • D-15 Vent termination, horizontal
  • D-108 PVC vent adapter kit
  • D-33 Centrotherm polypro vent adapter
  • Z-12 Condensate treatment kit
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Region availability

North America
United States