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Boiler Viessmann Vitodens 100-W Series Capacity 125,000 BTU

  • Rating
  • Capacity 125000
  • AFUE 95%
  • Fuel Type Natural Gas
  • CSA Listed Yes
  • ASME Certified Yes
  • Energy Star Listed Yes
  • AHRI Certified Yes
  • Warranty Up to 10 years on parts
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The comprehensive product range from Viessmann

Viessmann’s comprehensive range offers individual solutions and efficient systems for many application areas. This includes a complete line of high-efficiency oil and gas-fired boilers, solar thermal systems, and control technology.

Whether the project is new construction or retrofit, single-family home, or district heating networks, Viessmann has an ideal heating solution. From individual system components to fully integrated systems – all products are future-proof and economical.


Viessmann offers a comprehensive range of home comfort products that sets the standards for sustainability and efficiency. The Viessmann Vitodens 100 boiler was introduced to offer the perfect mix of performance and value. The Vitodens 100 features a compact design and quiet operation, making it the ideal boiler for small spaces. Equipped with state-of-the-art Viessmann radial heat exchangers and cylinder burners, the entire Vitodens lineup boasts a 95% AFUE rating. With versatile venting options and user-friendly controls, the Vitodens 100 is a favorite among professionals and homeowners alike.

Inox-Radial Heat Exchanger

  • The Vitodens 100 boiler features a unique and highly efficient Inox-Radial heat exchanger designed and manufactured by Viessmann. Additionally, this self-cleaning heat exchanger contributes to the Vitodens’s long service life and dependable performance.

Installation and Service Flexibility

  • The Vitodens 100 was designed for ease of installation and maintenance with all bottom pipe connections, accessible service components, fuel flexibility, and multiple venting options.

Touchscreen Control

  • With easy-to-use touchscreen control, the backlit LCD display features advanced programming options, so you can easily set the boiler to your liking.

Compact Size

  • For the amount of power harnessed within the Vitodens 100 unit, you wouldn’t expect such a small package. Perfect for installations in tight spaces, the Vitodens 100 doesn’t need clearance to combustibles and features low-noise operation.


  • Model B1HA125
  • Fuel Type Natural Gas
  • Combustion Type Condensing
  • Vent Type Direct Vent
  • Modulating/Staging Modulating
  • Mount Type Wall
  • Minimum Altitude 0 Feet
  • Maximum Altitude 10000 Feet
  • Includes Pump Yes
  • AFUE 95%
  • Maximum Input Capacity 125000 BTU
  • Minimum Input Capacity 21000 BTU
  • DOE Heating Capacity 116000 BTU
  • Net I=B=R Capacity 101000 BTU
  • Ultra Low NOx Emissions No
  • Voltage 115 Volts
  • Phase 1
  • Frequency 60 Hz
  • Flue Connection Size 2 Inches
  • Gas Connection Size 3/4 Inch
  • Supply Connection 1 Inch
  • Return Connection 1 Inch
  • Product Height 30 1/8 Inches
  • Product Width 15 3/4 Inches
  • Product Depth 79.4 Pounds
  • Product Weight 88 Pounds
  • CSA Listed Yes
  • ASME Certified Yes
  • Energy Star Listed Yes
  • AHRI Certified Yes
  • AHRI Reference Number 10594297
Boiler Viessmann Vitodens 100-W Series Capacity 125,000 BTU
*Product With Installation


How do I choose the right size of central AC for my home?
Various factors need to be considered such as
• Specific region and climate in which you live
• Orientation of your home (for example, if it faces west)
• Size and age of your windows
• Your home’s ventilation system and ductwork
• Quality and quantity of your home’s insulation
• Age of your home
How does a new high efficiency AC will help me save energy bills?
Choose ENERGY STAR® certified ACs
ENERGY STAR certified central air conditioners have higher seasonal energy efficiency ratio (SEER) ratings and use less energy than conventional new models*. Our experts can help you choose an ENERGY STAR certified AC that’s right for your needs. Schedule a no-obligation, in-home consultation with a Home Comfort Advisor today.
How long does an installation take? What time will they arrive? Do I need to be home for the installation?
Every installation is different, and every project presents unique installation challenges, but we aim to have all installations completed in one day. Technicians will arrive at the prearranged agreed upon time and will keep you updated on the progress throughout the day. We always recommend that homeowners are present during installation, but if that’s not possible, we require someone over the age of 18 to be home during installation.
Can I buy it online and install by myself?
HVAC or Boiler installation requires electrical, gas and refrigerant knowledge as well as familiarity with local bylaws and building codes. Failure to properly install HVAC equipment can create safety concerns and performance issues as well as void manufacturer warranties. For those reasons, we always recommends professional installation.
What Are Maintenance Needs of the Air Conditioner?
Scheduling preventive maintenance is essential if you want to protect your investment in your air conditioner. Routine basic maintenance helps prevent problems from occurring and extends the life of your air conditioning unit.
Along with your air conditioning installation, ask about the preventative maintenance service of your contractor. What is included, and what is the cost?
When Can You Install My New Air Conditioner?
There’s just one more thing to do. You should consider the best time to install your new air conditioner.
If you have an existing air conditioner that is not working and summer is approaching then you may want to get this done soon. Even if you have a functioning air conditioner, the installation process will mean you will be without air conditioning for at least some time. There will also be some disruption in your home while work is completed.
Discuss your preferred installation timescale with your home comfort advisor. They will explain the process and work with you to keep disruption to a minimum.

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