Replacement products for the Viessmann Vitodens 100-W B1KA Combi Boiler

Viessmann Vitodens 100-W B1KA Combi Boiler

This product was discontinued in 2023.

Please refer to our replacement products listed above.

If you still cannot find what you are looking for, please contact us.

Product Sizing
  • 3.6 GPM DHW
Shipping Information
  • This item quallifies for $95 terminal shipping across Canada!
  • This item can be shipped directly to your address for an extra cost; contact our team for a personalized shipping quote.

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Yes, this product is Energy Star certified!

Click here to learn more about ENERGY STAR in Canada.

Greener Homes Grant Eligibility

No, this product is not eligible for the Canada Greener Homes Grant, except possibly for Northern or off-grid communities.

Click to learn more about the Canadian Greener Homes Initiative and product eligibility here.

  • Limited lifetime warranty in residential applications
  • Limited 5 Year Parts Warranty

Click here to learn more how warranty works.


Not sure if this product is right for you? Require advice selecting the correct unit?

Contact our team for professional support.

Performance, Quality, & Value Combi Boiler & Domestic Hot Water Heater

Are you stuck with a tiny mechanical room in your house or apartment? Do you need a replacement boiler system for your in-floor heating or other home heating solution? Want to get rid of that giant hot water tank taking up precious floor space? Want a solution that is also eco-conscious & efficient? If you answer yes to any of the above, a Viessmann Vitodens 100-W Combi Unit is the solution for you, providing both hot water for home heating like a traditional boiler, while also providing you with a limitless supply of domestic hot water (at 3.6 GPM)!

With its outstanding design and price/performance ratio, the Vitodens 100-W is the perfect mix of performance and value. Its compact design, zero clearance to combustibles and extremely quiet operation make the Vitodens 100-W an ideal choice even in the smallest spaces. Plus, with a limited residential lifetime warranty, you can be sure your investment will deliver long-lasting, value year after year.

Keys features of the Viessman Vitodens 100-W B1KA 125,000 BTU/hr Combi Unit:

  • On-demand domestic hot water - 3.6 GPM of unlimited hot water fed to your home (long shower, anyone?)
  • Combi boiler unit can both heat your home & replace your traditional water heater for domestic hot water supply
  • Compact & light-weight wall mounted design; can be placed in the washroom, in the mechanical room, above your laundry machine - anywhere with suitable accessibility & exhaust options
  • Tankless on-demand hot water solution, freeing up precious floor space in your home & eliminating costly hot water tank replacements
  • Extremely quiet operation; quieter than most refrigerators
  • User-friendly backlit LCD touchscreen boiler control
  • Low-emission combustion with fully-modulating Viessmann stainless steel MatriX cylinder burner for natural gas or propane
  • Self-cleaning heat exchanger helps extend the service life
  • Canada EnerGuide Rating rating of 95!
  • Receiver of the 2020 Energy Star Most Efficient designation for gas boilers with efficiencies over 95% AFUE

BPH Sales is also able to put you into contact with trusted, certified professional who can design a complete boiler system for your home. To request a quote for installation or a full boiler system design from our trusted network of professionals, make sure to select "Yes - please connect me with a local professional" at checkout.

Note: it is possible to convert this combi boiler unit to be propane compatible; please contact us directly for a quote.

Safety warning: this is a gas appliance, and as such, requires certified, professional installation. Failure to properly install & commission a gas furnace can lead to serious damage, injury, or death.

More information regarding the Vitodens Gas Condensing Boiler can be found below:

Vitodens 100-W by Viessmann

Gas Condensing Boilers

Viessman Products

Vitodens Energy Star 2020

Vitodens Warranty Information & Registration

Product Dimensions & Sizing Approximations:


BTU/Hr Input Dimensions (H x W x D)
125,000 BTU/hr
30.125" x 15.75" x 15.75"