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Comfortable. Efficient. Intelligent Heating.
G124X | G234X | G334X
Atmospheric Gas Boilers
Setting the Standard for Efficiency
High Efficiency: Full line of Atmospheric Gas Boilers
Flexible, Corrosion Resistant GL-180M Cast Iron
Limited Lifetime Warranty
Electronic Ignition, 3" Thermal Insulation on all Models
74,000 to 542,000 BTU/Hr Input
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G124X | G234X | G334X
Intelligent Heating – By Design
Buderus, the world leader in hydronic
heating technology, manufactures the
highest quality boilers based on
centuries of experience. With its
innovative design and quality
manufacturing, a Buderus boiler will
outlast and out-perform virtually any
other residential hot water system in
the world.
The G124X, G234X and G334X
are designed in Europe, where fuel
costs are significantly higher and
environmental regulations are more stringent. Established in 1731, Buderus uses
state-of-the-art techniques in the design and manufacturing of its boilers.
Manufactured with the patented Buderus GL-180M flexible cast iron, the sections
are tightly joined together and sealed by profiled, beveled steel push nipples,
ensuring a long life. Special compounds provide a gas-tight seal for safe and
efficient operation. And, thanks to the GL-180M cast iron’s amazing flexibility, this
boiler resists thermal shock under conditions of rapid temperature change. All
models are atmospheric vented.
Manufactured with the patented
Buderus GL-180M flexible cast
iron, the sections are tightly
joined together and sealed by
profiled, beveled steel push
nipples, ensuring a long life.
GL-180M Gray Cast Iron:
Buderus GL-180M silicone injected, gray cast iron has excellent corrosion
resistance, exceptional casting characteristics and 40% greater flexibility and
elasticity as well as high thermal conductivity. Buderus developed the special
substances that are impregnated during the casting process to improve the
mechanical properties of cast iron. The graphite precipitates into smaller, modified
flakes which produce GL-180M cast iron with 40% greater elasticity and a high
silicone barrier for corrosion protection. Gray cast iron obtains its superior
material characteristics primarily from a high carbon (graphite) and silicone
content. Additional elements further enhance the properties of the GL-180M.
The graphite appears in two different forms in the microstructure: nodular form
producing excellent tensile strength and great elasticity and graphite flakes
producing excellent corrosion resistance against acidic combustion products.
Manufactured with the patented Buderus GL-180M flexible cast iron, the sections
are tightly joined together and sealed by profiled, beveled steel push nipples,
ensuring a long life.
Special compounds provide a
gas-tight seal for safe and efficient
operation. And, thanks to the
GL-180M cast iron’s amazing
flexibility, this boiler resists thermal
shock under conditions of rapid
temperature change.
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Quality
Manufactured by Buderus, the world leader in cast iron boiler design and
production, the G124X, G234X and G334X construction consists of flexible GL-
180M cast iron, designed to resist thermal shock for long life and a high silicone
cast iron surface for excellent corrosion resistance. They each have staggered
contoured fins for optimum heat transfer and efficient operation, high precision
castings with steel push nipples, sectional construction, and deluxe, heavy gauge
blue enameled jacket for a clean finished appearance. There is a full 3" of thermal
insulation for minimal standby heat loss coupled with an integral draft diverter for
low profile. All models are easily converted to propane, and they also offer low
emissions with Premixed Burner Technology. Durable, quiet and efficient, Buderus
boilers are designed for many years of trouble-free operation.
Superior Design
Flueways of Buderus boilers have
a gas tight seal thanks to a tongue
and groove section design and
elastic high temperature resistant
sealing material. This seal is fully
pressed into the groove during
assembly.
G234X Boiler
Efficiency
The G124X, G234X, and G334X Series Boilers are available in natural gas or easily
converted to propane and feature AFUE ratings up to 84.8% for high efficiency
and top performance. Stainless steel premixed factory tested burners allow for low
emissions, and a full 3" of thermal insulation virtually eliminate standby loss and
stack temperature losses. Buderus boilers are designed for a long life, providing
efficiency and durability for the homeowner that is unsurpassed by the competition.
Stainless Steel Premixed Burners
Low emissions with Premixed Burner Technology
Factory tested for natural gas operation
All models easily convert to propane
Complete burner tray is easily removed
Durable, quiet, efficient and designed for long life
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G124X | G234X | G334X
Upgrade your system for added comfort to your home!
Once you have a Buderus boiler you can add a Buderus indirect fired hot water
tank, an optional Buderus Logamatic control or both. The Logamatic control
maximizes your comfort and fuel savings, and it will also accommodate specialized
heating applications such as radiant flooring. Combined, this premium heating
system will provide years of exceptional comfort and economy...for little more than
the cost of a standard replacement component.
Domestic Hot Water Tanks
Convenient Logamatic Control
The Buderus indirect
fired domestic hot
water tanks are
designed to fit any
specialized need.
To maximize space,
the G234X/G334X
can be paired with
Buderus vertical
ST-tanks. These tanks increase boiler
efficiency, system longevity and
minimize the need of service calls,
when paired with a Buderus boiler.
The tanks are designed with many
features to aid in maintenance, such
as easy access ports for interior
cleaning, extra thick Magnesium anode
rods (or optional electrical anode) and
Thermoglaze® interior tank coating to
protect against corrosion and aid in
cleaning. To help maximize efficiency the
tanks are so well insulated against heat
loss, they lose less than a ¼˚ F per hour.
The Buderus Logamatic Controls,
designed to work with most Buderus
boilers, significantly increase the
efficiency of your heating system.
The Controls maintain a comfortable
environment by measuring indoor
and outdoor temperatures in order to
automatically and effectively regulate
the temperature of the boiler. This
allows the boiler to use less fuel while
keeping your home exactly as warm as
you want it. The Logamatic Controls
also include the convenience of a
setback feature for nighttime as well
as domestic hot water priority. So, no
matter how hard the heating has to
work on a cold day, there will always
be hot water for showers. All control
functions are able to be customized
by you. Additionally, the Buderus
Logamatic R2107 is designed with a
built-in self diagnostic system to aid in
maintenance and reduce service costs.
Panel Radiators
A cleaner, quieter, and more
comfortable source of heat ...
Buderus manufactures a whole range
of high-quality radiators to precisely
match your taste in decor and
satisfy heating requirements. Panel
radiators produce two types of heat:
radiant and convected. Radiant heat
like the sun warms objects rather
than just the air, creating a greater
sense of warmth faster and at lower
room temperatures. Forced hot air
or fin-tube baseboard systems only
produce heat that warms the air
(i.e., convected heat). The design of
Buderus radiators eliminates noise,
... no more clanking and hissing.
Our radiators require less space
than baseboard enabling greater
flexibility with furniture placement. And
Buderus’ unique styling also minimizes
areas where dust and dirt can collect.
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G124X
Model G124X/18 G124X/25 G124X/32
Performance Data
Input Rate BTU/Hr 74,000 103,000 132,500
DOE Heating Capacity BTU/Hr 61,400 85,500 110,000
Net IBR BTU/Hr 53,000 75,000 96,000
AFUE % 84.3 84.2 84.6
Piping Connections
Pressure Drop @ 20° F
∆ T (In WC)
B-Vent II Connection Size 5" 5" 6"
Boiler Supply & Return 1" 1" 1"
Gas Connection ½" ½" ½"
Min. Relief Valve 62 lb./hr. 86 lb./hr. 110 lb./hr.
Physical Dimensions
Number of Burner Tubes 2 3 4
Boiler Width 23½" 23½" 23½"
Height 33⅛" 33⅛" 33⅛"
Dimension A 8¾" 5⅛" 1⅝"
Dimension B 7¼" 8⅛" 9"
Dimension C 4½" 5⅛" 5⅛"
Dimension D 15" 13½" 13½"
Dry Weight (lbs.) 229 240 337
Water Content (gal.) 2.4 2.9 3.4
18.8 22.9 32.2
G124X boilers will stack on Buderus
LT160, LT200, and LT300 tanks.
Approval Numbers
MEA 100-96-E
G3-1103-58
Quick-FitTM Modular Piping System
The Quick-Fit System takes only
minutes to connect and includes all
the piping, valves, circulating and
control elements to feed both radiant
floor heating zones and conventional
high-temperature heating zones. Not
only will a Quick-Fit system save time
and money on any boiler installation, it
also eliminates incorrect valve or motor
installations. Additionally it ensures
a clean, finished and professional
installation. The Quick-Fit system
consists of three main components, the
Quick-Mix Mixing Station for radiant
flooring applications, the Quick-Pump
Station for high-temperature zones and
the Quick-Header Manifold for multitemp heating systems. The QuickFit System can be used to connect
virtually any piping arrangement.
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G234X G334X
Rear View Side View Front View Top View
28¾
13¾
W
Vent
25 ¾"
40 ¾"
1½" Supply
1" Storage Tank
1½" Return
½" Drain
Allow 33" Access
for Servicing
2" Minimum
2" Minimum
2" Minimum
6" Minimum
Model G234X/38 G234X/45 G234X/55
Performance Data
Input Rate BTU/Hr 160,000 187,000 228,000 266,000
DOE Heating Capacity BTU/Hr 130,000 154,000 188,000 219,000
Net IBR BTU/Hr 113,000 134,000 163,000 190,000
AFUE % 84.3 84.1 84.8 84.3
Piping Connections
Pressure Drop @ 20° F ∆ T (In WC)
16.1 22.1 25.3 28.9
Vent Size 7" 7" 7" 8"
Damper Included? Yes Yes Yes Yes
Gas Connection ¾" ¾" ¾" ¾"
Physical Dimensions
Number of Burner Tubes 3 3 4 5
Boiler Width (W) 259∕16" 259∕16" 29⅛" 32¾"
Height 38½" 38½" 38½" 38½"
Dry Weight (lbs.) 487 487 562 684
Water Content (gal.) 6.1 6.1 7.1 8.2
Vent 7" 7" 7" 8"
G234X/64
Approval Numbers
MEA 217-98-E
CRN No# 7169.7C
G3-0106-184
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Model
Rear View Side View Front View Top View
28¾
13¾
W
Vent
25 ¾"
40 ¾"
1½" Supply
1" Storage Tank
1½" Return
½" Drain
Allow 33" Access
for Servicing
2" Minimum
2" Minimum
2" Minimum
6" Minimum
G334X/73 G334X/92
G334X/116
G334X/132
Performance Data
Input Rate BTU/Hr 301,000 378,000 476,000 542,000
DOE Heating Capacity BTU/Hr 249,000 314,000 396,000 451,000
Net IBR BTU/Hr 217,000 273,000 344,000 392,000
Comb. Eff. (%) 82.7 83.1 83.2 83.2
Piping Connections
Pressure Drop @ 20° F ∆ T (In WC)
32.1 44.1 54.2 60.2
Vent Size 8" 9" 10" 10"
Damper Included? Optional Optional Optional Optional
Gas Connection ¾" ¾" ¾" ¾"
Physical Dimensions
Number of Burner Tubes 5 6 7 8
Boiler Width (W) 34¾" 41¾" 48¾" 56"
Height 40¾" 40¾" 40¾" 40¾"
Dry Weight (lbs.) 758 930 1,093 1,265
Water Content (gal.) 9.2 11.4 13.5 15.6
Vent 8" 9" 10" 10"
Approval Numbers
MEA 217-98-E
CRN No# 7169.7C
G3-0106-184
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G124X | G234X | G334X: Atmospheric Gas Boilers
Buderus boilers are manufactured to the highest standards. The
boilers are designed with premixed burner technology for low
emissions, a factory tested gas operation, and are field converted
to propane.
To aid in cleaning and servicing the burner tray is completely
removable. All Buderus boilers are durable, quiet, efficient and
designed for long life.
G334X Boiler
Special Features G124X G234X G334X
Integral draft diverter for low profile
AFUE ratings over 84%
Two stage firing capabilities
30 PSI relief valve, drain and P&T gauge
Standard non-combustible base
Approved for 2" side clearance to combustibles
All rear tappings for clean, finished appearance
Plug-in connection for vent damper
Boiler sizes 18 to 64 units completely assembled, jacket installed
Combined slow opening gas control valve
Approved for installation on combustible flooring
Standard Honeywell control components
1" Supply and return tappings, ½" NPT gas connection
1½" Supply and return tappings, ¾" NPT gas connection
Can be stacked on the LT Tanks
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Bosch Thermotechnology Corp.
50 Wentworth Avenue Londonderry, NH 03053
Tel: (603) 552-1100 Fax: (603) 584-1681 www.buderus.net
Subject to change without notice
© 2009 Bosch Thermotechnology Corp.
Part Number 44499023 06/09
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