Buderus G234X, G334X, G124X/18, G124X/25, G124X/32 Brochure & Specs

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

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.

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

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.

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.

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

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

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: [phone] Fax: [phone] www.buderus.net

Subject to change without notice

© 2009 Bosch Thermotechnology Corp.

Part Number 44499023 06/09