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G124X - G234X - G334X
Atmospheric Gas Boilers
Setting the Standard for Effi ciency
High Effi ciency: Full line of Atmospheric Gas Boilers
Flexible, Corrosion Resistant GL-180M Cast Iron
Limited Lifetime Warranty
74,000 to 542,000 BTU/Hr Input
Electronic Ignition, 3" Thermal Insulation on all Models
omfortable. Effi cient. Intelligent Heating
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G124X - G234X - G334X
Manufactured with the patented
Buderus GL-180M fl exible cast
iron, the sections are tightly joined
together and sealed by profi led,
beveled steel push nipples, ensuring
a long life.
Intelligent Heating – By Design
Buderus, the world leader in 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 signifi cantly 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 fl exible cast iron, the sections are tightly joined
together and sealed by profi led, beveled steel push nipples, ensuring a long life. Special compounds
provide a gas-tight seal for safe and effi cient operation. And, thanks to the GL-180M cast iron’s
amazing fl exibility, this boiler resists thermal shock under conditions of rapid temperature change.
All models are atmospheric vented.
GL-180M Gray Cast Iron:
Buderus GL-180M silicone injected, gray cast iron has excellent corrosion resistance, exceptional
casting characteristics and 40% greater fl exibility 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, modifi ed
fl akes 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 fl akes producing excellent
corrosion resistance against acidic combustion products. Manufactured with the patented Buderus
GL-180M fl exible cast iron, the sections are tightly joined together and sealed by profi led, beveled
steel push nipples, ensuring a long life.
Special compounds provide a gas-tight seal
for safe and effi cient operation. And, thanks
to the GL-180M cast iron’s amazing fl exibility,
this boiler resists thermal shock under
conditions of rapid temperature change.
1-800-283-3787
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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 fl exible 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 fi ns for optimum heat transfer and effi cient operation, high precision cast-
ings with steel push nipples, sectional construction, and deluxe, heavy gauge blue enameled jacket
for a clean fi nished appearance. There is a full 3" of thermal insulation for minimal standby heat loss
coupled with an integral draft diverter for low profi le. All models are easily converted to propane,
and they also offer low emissions with Premixed Burner Technology. Durable, quiet and effi cient,
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
Effi ciency
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 effi ciency and top performance. Stainless
steel premixed factory tested burners allow for low emissions, and a full 3 inches of thermal
insulation virtually eliminate standby loss and stack temperature losses. Buderus boilers are designed
for a long life, providing effi ciency 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 and effi cient, designed for long life
www.buderus.net
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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 fi red 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 fl ooring. 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
fi red domestic hot water
tanks are designed to
fi t any specialized need.
To maximize space, the
G234X/G334X can be
paired with Buderus
vertical ST-tanks. These
tanks increase boiler
effi ciency, 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 effi ciency the tanks come well
insulated resulting in a heat loss of literally less
than a fraction of 1ºF per hour.
The Buderus Logamatic Controls, designed
to work with most Buderus boilers,
signifi cantly increase the effi ciency 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.
Quick-Fit
The Quick-Fit System takes only minutes to
connect and includes all the piping, valves,
circulating and control elements to feed both
radiant fl oor 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, fi nished and professional
installation. The Quick-Fit system consists of
three main components, the Quick-Mix Mixing
Station for radiant fl ooring applications, the
Quick-Pump Station for high-temperature zones
and the Quick-Header Manifold for multi-temp
heating systems. The Quick-Fit System can be
used to connect virtually any piping arrangement.
TM
Modular Piping System
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 fi n-
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 fl exibility
with furniture placement. And Buderus’
unique styling also minimizes areas
where dust and dirt can collect.
1-800-283-3787
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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) 18.8 22.9 32.2
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 Burners 2 3 4
Boiler Width 23 ½" 23 ½" 23 ½"
Height 33 ⅛" 33 ⅛" 33 ⅛"
Dimension A 8 ¾" 5 ⅛"1 ⅝"
Dimension B 7 ¼" 8 ⅛"9"
Dimension C 4 ½" 5 ⅛"5 ⅛"
Dimension D 15" 13 ½" 13 ½"
Dry Weight (lbs.) 229 240 337
Water Content (gal.) 2.4 2.9 3.4
Approval Numbers
MEA 100-96-E
G3-1103-58
www.buderus.net
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G234X
m
Model G234X/38 G234X/45 G234X/55 G234X/64
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 Burners 3 3 4 5
Boiler Width (W) 25 9∕16" 25 9∕16" 29 ⅛" 32 ¾"
Height 38 ½ " 38 ½ " 38 ½ " 38 ½ "
Dry Weight (lbs.) 487 487 562 684
Water Content (gal.) 6.1 6.1 7.1 8.2
Approval Numbers
MEA 217-98-E
CRN No# 7169.7C
G3-0106-184
W
40 ¾"
28¾
1½" Supply
1" Storage Tank
1½" Return
½" Drain
Vent
13¾
25 ¾"
Rear View Side View Front View Top View
2" Minimum
Allow 33" Access
for Servicing
6" Minimum
2" Minimum
2" Minimu
1-800-283-3787
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G334X
m
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 Burners 5 6 7 8
Boiler Width (W) 34 ¾" 41 ¾" 48 ¾" 56"
Height 40 ¾" 40 ¾" 40 ¾" 40 ¾"
Dry Weight (lbs.) 758 930 1,093 1,265
Water Content (gal.) 9.2 11.4 13.5 15.6
Model G334X/73 G334X/92 G334X/116 G334X/132
W
40 ¾"
28¾
1½" Supply
1" Storage Tank
1½" Return
½" Drain
Vent
13¾
25 ¾"
Rear View Side View Front View Top View
Approval Numbers
MEA 217-98-E
CRN No# 7169.7C
G3-0106-184
2" Minimum
Allow 33" Access
for Servicing
6" Minimum
2" Minimum
2" Minimu
www.buderus.net
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G124X - G234X - G334X
Gas-Fired 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 fi eld converted to propane.
To aid in cleaning and servicing the burner tray is
completely removable. All Buderus boilers are durable,
quiet, effi cient and designed for long life.
G334X Boiler
Special Features G124X G234X G334X
Integral draft diverter for low profi le
AFUE ratings over 84%
Two stage fi ring 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, fi nished 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 fl ooring
Standard Honeywell control components
1" Supply and return tappings, ½" NPT gas connection
1½" Supply and return tappings, ¾" NPT gas connection
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BBT North America Corporation
50 Wentworth Avenue
Londonderry, NH 03053
Tel: (603) 552-1100
Fax: (603) 584-1681
Subject to change without notice
© 2007 Buderus
Part Number 44499023-04/07
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