Viessmann Vitodens 100-W, B1KA-125 125,000 BTU, Wall-Mounted Gas-Fired Condensing Boiler



  • Wall-mounted, gas-fired condensing boiler with modulating stainless steel MatriX cylinder burner
  • 125,000 BTU's (BTU (Max): 125000 BTU (Min): 21000)
  • Reliable and Manufacturer Warranty Backed
  • Made in Germany
  • Fuel Type: Natural Gas Propane
  • Efficiency: 95%
  • Gas Connection: 3/4" System
  • Type: Hydronic (Water)
  • Features: Condensing Wall Mounted


Product information

Technical Details


Gas-fired wall-mounted condensing boiler with modulating stainless steel cylinder burner and Inox-Radial heat exchanger surface.

Other info:


Specification Sheet

Warranty Information

  • All the benefits of a Vitodens 100-W boiler, plus built-in on-demand domestic hot water (DHW) – no need for an additional storage tank
  • DHW at the snap of your fingers all day long! Up to 3.5 GPM†
  • Optimized load matching with up to 6:1 turndown ratio
  • Energy-saving and low-cost, on-demand indirect-fired DHW production
  • Conforms to NSF/ANSI 372 for Low Lead Content
  • Quality you can count on! Stainless steel heat exchanger, built-in pressure bypass and 150 psig working pressure rating (on DHW side only)
  • Reliable and consistent DHW supply with built-in DHW temperature and flow sensors
  • Complete space / DHW heating management by boiler control, powerful built-in 3-speed pump and diverting valve

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