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Wall-Mounted Gas Condensing Boiler Buderus GB142 Series Capacity 104,000 BTU

  • Rating
  • Capacity 104000
  • AFUE 95%
  • Fuel Type Natural Gas
  • CSA Listed Yes
  • ASME Certified Yes
  • Warranty Up to 10 years on parts
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Steel for the future. With a long tradition.

Buderus AG is the holding company for the German Buderus concern, best known for three main divisions producing steel, cast iron pipe systems, and heating systems. The Heating Products division, Buderus Heiztechnik, produces furnaces, burners, boilers, solar heating systems, and heating control systems and supplies.


The GB142 condensing boiler from Buderus is an impressive display of both efficiency and longevity. The advanced flue circuit of the GB142/45 works with the included modulating burner to extract every last BTU of heat energy out of the flue gas that comes into your home. The small size of the GB142 combined with its minimal installation clearances gives you astounding installation flexibility. Included with the boiler is a low-loss header, an internal manifold that guarantees proper fluid flow through the inside of the boiler at all times.

Condensing Technology Improves Efficiency

  • The GB142 is a condensing boiler, using the leftover energy in the boiler’s flue exhaust to further heat your home. Keep your home warmer for less energy cost!

Included AM10 Outdoor Reset and DHW Sensor

  • The GB142 line of boilers includes an AM10 outdoor reset control for optimal efficiency during temperate months and a DHW sensor for direct control of an indirect hot water tank.

Prefabricated Low-Loss Header

  • The GB142 comes with an internal low-loss header pre-installed. It ensures proper fluid flow rate throughout the unit, extending operation lifetime and bringing installation time down to an absolute minimum.

Small Size and Low Installation Clearances

  • Low installation clearances on all sides, wall mounting configuration, and small footprint translate into a boiler that can be installed almost anywhere.


  • Model GB142
  • Fuel Type Natural Gas
  • Combustion Type Condensing
  • Vent Type Direct Vent
  • Modulating/Staging Modulating
  • Mount Type Wall
  • Minimum Altitude 0 Feet
  • Maximum Altitude 2000 Feet
  • Includes Pump Yes
  • AFUE 95%
  • Maximum Input Capacity 160900 BTU
  • Minimum Input Capacity 42500 BTU
  • DOE Heating Capacity 142000 BTU
  • Net I=B=R Capacity 124000 BTU
  • Ultra Low NOx Emissions Yes
  • Voltage 120 Volts
  • Phase 1
  • Frequency 60 Hz
  • Flue Connection Size 3 Inches
  • Gas Connection Size 3/4 Inch
  • Supply Connection 1 Inch
  • Return Connection 1 Inch
  • Product Height 28 Inches
  • Product Width 35 1/2 Inches
  • Product Depth 18 3/4 Inches
  • Product Weight 143 Pounds
  • CSA Listed Yes
  • ASME Certified Yes
Wall-Mounted Gas Condensing Boiler Buderus GB142 Series Capacity 104,000 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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