Vitodens 100-W B1HA

The previous generation – get it while you can!

Vitodens 100-W is a gas-fired wall-mounted condensing boiler with MatriX cylinder burner and Inox-Radial heat exchanger made of stainless steel. Rated input: 21 to 125 MBH.

B1KA model offers on-demand DHW
LCD touch screen
4-pipe connection design
Built-in pump & diverter valve

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Highly efficient

95% AFUE rating on all models.

Excellent value

With an outstanding price/performance ratio and design.

Fuel flexibility

Uses natural gas or liquid propane – no mechanical adjustments required.

Easy installation and service

All pipe connections located at the bottom and serviceable components accessible from the front.

Multiple venting options

And venting flexibility with vent length up to 200 ft (61 m).

Compact, lightweight design

And zero clearance to combustibles make it a great choice for limited-space installations.

Every home, every budget

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.

Outstanding versatility

The Vitodens 100-W offers the right solution for every demand – from multiple venting options to fuel flexibility (NG or LP) right out of the box. Plus, installation, service and maintenance are designed to be fast and easy with all pipe connections located at the bottom and serviceable components easily accessible from the front.

Stainless steel MatriX cylinder burner

Reliable and consistent performance

Stainless steel is the best choice for long-term reliability. That's why the Vitodens 100-W is equipped with a stainless steel Inox-Radial heat exchanger and MatriX cylinder burner. Developed and manufactured by Viessmann, these high-quality stainless steel components maximize performance and reliability. Plus, the "self-cleaning" heat exchanger contributes to the boiler’s long service life and dependable performance.

Lifetime warranty

With a limited lifetime warranty in residential applications, you can be sure your investment will deliver long-lasting value, year after year. For detailed terms and conditions, see the  warranty sheet.

Stainless steel Inox-Radial heat exchanger

Advantages of the Vitodens 100-W

Fits any home and budget with high performance at an attractive price.
Outstanding efficiency of 95% AFUE on all models.
Lasting performance with proven Viessmann titanium-stabilized stainless steel Inox-Radial heat exchanger.
Low-emission combustion for environmentally-friendly operation.
Built-in on-demand domestic hot water with Vitodens 100-W, B1KA combi boiler.
Fully-modulating input eliminates energy waste.
Suitable for altitude levels of up to 10,000 ft. / 3,000 m.
Extremely quiet operation; quieter than most refrigerators.

Look inside the boiler

B1KA model

  1. Inox-Radial heat exchanger.
  2. MatriX cylinder burner.
  3. Integrated expansion tank (B1KA combi boiler only).
  4. Variable speed combustion fan.
  5. Integrated pump.
  6. Plate heat exchanger for on-demand DHW (B1KA combi boiler only).
  7. Backlit LCD touchscreen.

Product details

Fuel type

Natural gas (NG) or liquid propane gas (LPG)

Min. input (NG)

21,000 BTU (6.2 kW) for all models

Max. input (NG)

94,000 BTU (27.5 kW) for B1HA-94
125,000 BTU (36.6 kW) for B1HA-125 &  B1KA-125

Efficiency (AFUE)

95%  for  all models


79.4  lbs (36 kg) for B1HA-94 & B1HA-125
90 lbs (41 kg) for B1KA-125

Overall dimensions


15¾ inches (400 mm)  for all models


15¾  inches (400 mm) for all models


30¼ inches (768 mm)  for  all models

On-demand DHW for B1KA model

Continuous draw rate *

3.5 USG/min (795 L/h)  for B1KA-125

* At  Δ t = 77°F (43K).  Maximum DHW supply temperature is 140°F (60°C).

Max. flow through heat exchanger

3.7 USG/min (840 L/h)  for B1KA-125


Limited lifetime warranty in residential applications. See warranty sheet for details.

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