XTherm Condensing Water Heaters, 1005A-2005A

The proven XTherm - vertical modulating condensing heater in sizes 999 to 1999MBTU. XTherm combines time-honored high-recovery copper fin technology with cutting edge control and combustion advancements. The installer and building owner enjoy broad installation flexibility, easy commissioning, and long term reliability.

Model Number Full Input in
 Flue Dia.
WH7-1005A 999,000
WH7-2005A 1,999,000
 XTherm Condensing Water Heaters, 1005A-2005A


  • 97% efficiency.  Condensing, Cat IV venting required.
  • Bronze headers and pumps with copper finned-tube primary heat exchanger.  Cupronickel tubes available as options.  CSA Low Lead Certified 0.25% lead
  • Minimum continuous inlet water temperature (50°F)
  • Electronic modulating gas valve and burner, 7:1 turndown
  • Small footprint, less than 11 square feet
  • On-board diagnostic center, real English, no codes
  • All models indoor/outdoor construction
  • Complete cabinet protects all controls and wiring
  • Certified under SCAQMD rule 1146.2. Meets all Low NOx regulations.
  • Suitable for altitudes up to 10,000 ft. (derate above 5,000 ft.)
  • Primary-secondary piping required.
  • 0-10 VDC Remote set-point BMS Interface
  • 0-10 VDC Direct Drive
  • Available for natural gas or propane.
  • VERSA IC® control package.
  • Cascade control of up to 8 units, no external sequencer required.
  • Modbus® RTU port (RS485).


  • BACNet IP, BACnet MS/TP, Modbus TCP, N2 Metasys (B-85)
  • Lonworks (B-86)
  • Alarm with 4” Bell (E-5)
  • Low Water Cutoff (F-10)
  • Condensate Neutralizer (Z-12)
  • PVC Vent (Factory-Installed ONLY) (D-32)
  • Centrotherm® Polypropylene Vent Adapter (D-33)




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