Buderus 21, 22, Towel Warmers Design Manual
Panel Radiators
Design Manual
For Buderus Panel Radiator models:
- Model 21
- Model 22
- Towel Warmers
Panel Radiator
Design Manual
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Technical specications are subject to change without prior notice
Panel Radiator Design Manual | 12.2009
Applications manual
Panel Radiator
Design Manual
Table of Contents
1 General Info 5
2 Safety 6
3 Product Description 7
4 Mounting Guidelines 15
5 Radiator Output Ratings 17
6 Radiator Selection Procedure 21
7 Piping Arrangements 22
8 Buderus NB Style Towel Racks 32
Panel Radiator Design Manual | 12.2009 Technical specications are subject to change without prior notice
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Panel Radiator
Design Manual
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Technical specications are subject to change without prior notice
Panel Radiator Design Manual | 12.2009
Applications manual
1. General information
Panel Radiator
Design Manual
1.1. This manual
This application manual is intended for engineers,
architects, contractors, and installers. It provides
specication on panel radiator and towel rack models,
sizing information, and system layout assistance for
hydronic heating systems with panel radiators.
This manual describes the basic operation of the Buderus
panel radiators and towel racks, thermostatic controls and
piping accessories. It also provides rough in dimensions
and installation procedures.
Radiator heating capacities are listed by model, height and
length and are based on different supply water
temperatures.
For added savings Buderus recommends running panel
radiator systems at reduced temperatures. When using a
condensing boiler, the system should be designed so that
the return water temperature makes the boiler condense
except on the coldest days of the year.
Dew point ue gases:
• Natural Gas: 130°F (55°C)
• #2 Fuel Oil: 118°F (48°C)
1.2. Standards, regulations and directives
It is the responsibility of the installer to ensure that the
system corresponds to all current regulations and rules.
General guide lines are discussed with respect to sizing
and radiator selection. The design and radiator selection
process for one and two pipe heat distribution systems are
provided including examples. Quick and easy “rules of
thumb” for trouble free installation and operation are
presented.
Panel Radiator Design Manual | 12.2009 Technical specications are subject to change without prior notice
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2. Safety
Panel Radiator
Design Manual
2.1. Layout of the instructions
Two levels of danger are identied and signied by the
following terms:
WARNING! RISK OF FATAL INJURY
Identies possible dangers emanating from
a product, which might cause serious injury
or death if appropriate care is not taken.
WARNING! RISK OF INJURY/SYSTEM
DAMAGE
Indicates a potentially dangerous situation
that could cause minor or moderately
serious injuries and damage to property.
Additional symbols for identication of dangers and user
instructions:
USER NOTE
User tips for optimal use of equipment and
adjustment as well as other useful information.
2.4. Disposal
● Dispose of the packaging in an environmentally
responsible manner.
— Dispose of defunct components through an
authorized agent in an environmentally
responsible manner.
2.2. Please follow these instructions
Only use original Buderus spare parts.
Damage caused by the use of parts not
supplied by Buderus is excluded from the
Buderus warranty.
2.3. Tools, materials and accessories
For the installation of panel radiators and towel racks,
you will need standard tools used for central heating,
boiler and DHW water systems.
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Panel Radiator Design Manual | 12.2009
Applications manual
Panel Radiator
Design Manual
3. Product Description
With the line of panel radiators Buderus offers a real
alternative to conventional baseboard heating. For
decades Europeans have enjoyed the unsurpassed
comfort and versatility of radiant heat that is more exible,
efcient, and a cleaner alternative to baseboard heating.
Unlike conventional baseboard heat that provides only
convection heat, the high performance hydronic steel
panel radiators provide the perfect combination of both
convective and radiant heat while offering signicant
savings from lower water temperatures.
Radiant Heat vs. Convection Heat:
Forced hot air or baseboard systems with n tubes
produce heat that warms the air by convection, which
requires high water temperatures to effectively output
BTU. This results in large temperature differentials in the
room, can cause drafty conditions, and in many cases
results in hot air collecting at the ceiling and cooler air at
oor level.
Radiant heat, like the sun, warms objects rather than just
the air, creating a greater sense of warmth while requiring
lower room temperatures. The added radiant component
from panel radiators may permit return water
temperatures below 130°F (55°C) for natural gas and
118°F (48°C) for oil red appliances, allowing a
condensing boiler to condense and take advantage of its
added efciency.
Because Buderus radiators don’t turn “on and off”
randomly in the way traditional baseboards do, they are
virtually silent — eliminating the noise associated with
other heating systems.
The exibility of Buderus panel radiators offers builders,
designers, and homeowners a variety of sizes for any
heating and design requirement. These space-saving
panel radiators require between a third to a quarter of the
space of baseboard heating and are a perfect solution
where design exibility is important. The radiator’s unique
wall-mounted and optional oor-mounted styling also
minimizes areas where dust and dirt can collect and
allows for greater exibility in furniture placement.
Panel radiators from Buderus are stocked in several
heights and lengths, and in two widths.
Each panel radiator includes side panels, front and back
grill covers, and a owsetter valve. This feature enables
the system installer to quickly and easily regulate the
water ow through the radiator room by room. The result
is a consistent, even heat throughout all panel units in the
house — no more feeling warm in one room and chilly in
another.
Buderus Panel Radiators
Buderus “solidoux N” panel radiators are manufactured
from 18 Gauge (0.049”/0.125mm) steel panels. They
consist of water lled welded steel panels with convector
channels mounted on the back. These layers are
combined and arranged into two basic models:
model # 21 (width 2.5"), model # 22 (width 4.0").
Standard equipment with each radiator include wall
mounting brackets, bottom piping connections, built in
manual air vents, a drain plug and a ow setter valve with
a protective cover over it.
All stocking models have the ow setter (control) valve
and piping on the same side, and can be mounted facing
left or right.
Available Models
Model 21 Table 1
Dimensions Dry weight Water volume
H x L x W lbs kg gal liters
12"x24"x2"
12"x36"x2"
12"x48"x2"
12"x59"x2" 50 23 1.6 6.3
12"x63"x2" 54 24 1.8 6.7
12"x71"x2" 60 27 2.0 7.6
20"x24"x2" 35 16 1.0 3.8
20"x36"x2" 52 24 1.5 5.8
20"x48"x2" 69 31 2.0 7.7
20"x59"x2" 85 39 2.5 9.4
20"x63"x2" 91 41 2.6 10.1
20"x71"x2" 102 47 3.0 11.4
20 9 0.7 2.6
31 14 1.0 3.8
41 19 1.3 5.1
Special order sizes, up to 3‘ high and 10‘ long, are
available with a 4 to 6 week lead-time.
Buderus panel radiators come in a multi-layered, powder
coat enamel white nish that is durable, easy to clean
and ideal for most existing color schemes. They can also
easily be custom painted to any desired color.
Panel Radiator Design Manual | 12.2009 Technical specications are subject to change without prior notice
24"x24"x2" 41 19 1.2 4.5
24"x36"x2" 62 28 1.7 6.7
24"x48"x2" 83 38 2.3 8.9
24"x59"x2" 102 46 2.9 10.9
24"x63"x2" 108 49 3.1 11.7
24"x71"x2" 122 56 3.4 13.2
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Panel Radiator
Design Manual
Buderus Towel Warmers
Model 22 Table 2
Dimensions Dry weight Water volume
H x L x W lbs kg gal liters
12"x16"x4"
12"x24"x4"
12"x36"x4"
12"x48"x4" 48 22 1.3 5.1
12"x63"x4" 63 28 1.8 6.7
12"x71"x4" 71 32 2.0 7.6
20"x16"x4" 27 12 0.7 2.6
20"x24"x4" 41 19 1.0 3.8
20"x36"x4" 62 28 1.5 5.8
20"x48"x4" 82 37 2.0 7.7
20"x59"x4" 101 46 2.5 9.4
20"x63"x4" 108 49 2.6 10.1
20"x71"x4" 121 121 3.0 11.4
24"x16"x4" 33 15 0.8 3.0
24"x24"x4" 49 22 1.2 4.5
24"x36"x4" 74 34 1.7 6.7
24"x48"x4" 98 45 2.3 8.9
24"x59"x4" 121 55 2.9 10.9
24"x63"x4" 129 59 3.1 11.7
24"x71"x4" 146 66 3.4 13.2
16 7 0.4 1.7
24 11 0.7 2.6
36 16 1.0 3.8
Nothing is more comforting than a warm towel after a
bath or shower. European towel warmers from Buderus
are the perfect combination of contemporary styling and
economical luxury. Towel warmers are also an excellent
way to add heat and remove humidity and dampness
from any bathroom.
Available in three sizes, the NB style towel warmers are
nished in a high quality white enamel for use in damp
environments like bathrooms. They should not be
installed in showers or areas where they are exposed to
direct water spraying.
The NB style is perfect for minimal space requirements
with a total depth of 5“ and a width of 24“. It is available in
heights of 32“, 48“ and 72“. These ready-to install towel
warmers offer outputs from 2,000 BTU/Hr to 4,500 BTU/
Hr at an average water temperature of 176ºF (80ºC).
All Buderus towel warmers have the water connections
on the bottom and a manual air vent at the top. Mounting
hardware is included. Piping accessories, valves and
thermostatic heads are available as accessories.
Buderus towel warmers must not be used with
potable water or open loop systems.
Chapter 5 has detailed radiator output ratings in table and
graphical form.
36"x16"x4" 48 22 1.1 4.2
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Technical specications are subject to change without prior notice
Panel Radiator Design Manual | 12.2009
Applications manual
Panel Radiator
Design Manual
Radiator Accessories
Buderus offers a variety of accessories for installation
and control of the radiators for different piping
arrangements.
Mounting Brackets
Buderus panel radiators include wall mounting brackets.
Floor mounting brackets are available as an accessory.
Rough in instructions and mounting guidelines are
presented in chapter 5.
Piping Connections
Each stocking radiator has 20 mm (approx. 3/4) metric
male tappings on the bottom on one side. The radiator
can be mounted with these connections facing left or
right. Figure 9 shows supply and return connections
which cannot be reversed. Buderus supplies the following
compression ttings for most applications.
Compression ttings are available from Buderus in sets
of two (see Table 3). These ttings are normally secured
to the piping connection on the radiator. When diverter or
shutoff valves are used, the compression ttings mount
on the valve.
Compression ttings for panel radiators Table 3
Pipe size and style Part #
½" copper
12 x 2 mm (⅜" PEX)
16 x 2 mm (½" PEX)
20 x 2 mm (¾" PEX) 1016879
⅝" copper
6198924
1016870
1016874
1646851
Additional accessories are available that help with the
installation of the panel radiator as well as the application
in which it is installed.
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Panel Radiator
Design Manual
Part no. 1016311
Straight Diverter Valve
w/ isolation valves for
panel radiators
Part no. 1016362
Straight Crossover
Valve w/ isolation
valves for panel
radiators
Part no. 3L602502
Pressure Bypass
Valve 3/4" male
thread for panel
radiators and towel
racks
Part no. 013G81013
Single Valve, angled
with adjustment
facing down for towel
racks; Head can be
replaced with
thermostatic head
#013G8250 or
Part no. 3L0143
Angled Return
Elbow with
isolation valve for
towel racks
Part no. 013G5002
Manual Adjuster
for panel padiators
and towel racks
Part no. 1016312
Angled Diverter
Valve w/ adjustable
bypass and isolation
valves for panel
radiators
Fig. 1 Valve/accessory dimensions in inches
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Technical specications are subject to change without prior notice
Part no. 013G8250
Danfoss
Thermostatic Head
for panel radiators
Part no. 82911060
Drain Valve w/
hose bib for panel
radiators
Panel Radiator Design Manual | 12.2009
Applications manual
Panel Radiator
Design Manual
Part no. 80262170
Straight Valve
w/ isolation valves
for panel radiators
Part no. 80262172
Angled Valve w/
isolation valves for
panel radiators
Part no. 82721124
Buderus Thermostatic
Head for panel
radiators and towel
racks
Part no. 013G8015
Single Valve, straight with adjustment at front for towel racks;
Head can be replaced with thermostatic head #013G8250
or #82721124
Part no. 013G8014
Single Valve, angled with adjustment at the front for towel
racks; Head can be replaced with thermostatic head
#013G8250 or #82721124
Part no. 82721180
Buderus Thermostatic
Head w/ remote
sensor for panel
radiators and towel
racks - capillary 79"
(2000 mm)
Fig. 2 Valve/accessory dimensions in inches continued
Panel Radiator Design Manual | 12.2009 Technical specications are subject to change without prior notice
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