Residential Hydronic

Specialty & Made-to-Order Radiators

Overview

Runtal Specialty Radiators may be fabricated to match all of your architectural and aesthetic needs. Curved radiators, segmented radiators for bay windows and high-output double panels can be custom made. Column Radiators and our exclusive Hot Spring and Flow Form Designs offer one of a kind custom design and architecture. Please visit our Design Assistance and Custom Products page, or give us a call at 1-800-526-5621 with your special needs. Providing a unique heating solution is a specialty of ours.

Styles

Runtal Specialty Radiators may be fabricated to match all of your architectural and aesthetic needs. Curved radiators, segmented radiators for bay windows and high-output double panels can be custom made. Please contact Runtal with your special needs. Providing a unique heating solution is our specialty.

Made-to-Order Baseboard

Made-to-Order Wall Panels

Made-to-Order Vertical Panels

Runtal’s Vertical Panels are ideal for situations where floor space is limited such as entryways and kitchens. They are often found mounted behind a door or on a column.

Runtal can craft a perfect solution to fit your exact design or heat requirements with heights available from 20 to 354 inches (in 2” increments). Additional widths (up to 24 tubes or 69-3/4” wide) are also available upon request.

Column Radiators

Runtal’s Column Radiators are an ideal solution where the view in is as important as the view out. Where the design calls for floor to ceiling glass, column radiators may be pedestal mounted in front of the glass without obstructing the view. Column radiators may also be used as room dividers or balustrade. They may be either wall mounted, or pedestal mounted.

Curved & Segmented Radiators

Curved radiators, segmented radiators for bay windows and high-output double panels can be custom made. Please contact Runtal with your special needs. Providing a unique heating solution is a specialty.

High Output Radiators

High Output radiators provide answers for large window wall applications and entry ways where extra heat is needed, however space is limited. The Double panel/double fin or triple fin design provides roughly 2 to 2.5 times the heat output of our standard baseboard product.

Hot Spring Radiators

Brilliantly imaginative, the mesmerizing and stylish design of the Hot Spring captures a tightly coiled elegance in reflected light.

Flow Form Radiators

The industrial heating elements of the Flow Form appear as a beautiful object in its own right. The spiral fins add a dramatic twist to modern design.

Made-to-Order Baseboard

Overview

      

• Ideal where a low profile is desired
• Easy replacement for fin-tube or cast iron radiators
• Available from 20 inches to 29-1/2 feet in length

Runtal’s baseboard (made to order) is available in 1 to 4 tube heights. It may be manufactured in lengths from 20 inches to 29-1/2 feet long in increments of 2 inches. Ten standard colors as well as an array of designer colors are available. Runtal’s baseboard style is perfect for situations where sheet metal-covered fin-tube or cast iron is being replaced. In these cases, it is often easiest to use the existing piping and simply order the appropriate lengths.

Model:
Height:
Heat Output:
per Foot*
VLX7/7
2.8″
2″
380 BTUH/ft.*
VLX14/14
5.7″
2″
600 BTUH/ft.*
VLX21/21
8.6″
2″
770 BTUH/ft.*
VLX28/28
11.5″
2″
930 BTUH/ft.*

*Outputs shown are figured at 180°F

Operation & Maintenance

Hydronic Radiator Operation

  1. Radiators are manufactured in the USA of cold rolled low carbon steel and should be used only in closed closed hydronic systems to assure no corrosion of any system components.
  2. Proper radiator operation depends on adequate flow of water to the panel, which can only be accomplished when all the system air has been fully vented from the panels.
  3. Radiators should each be vented, with the system pressurized but in a static state (pumps off). Venting may need to be done periodically to assure a closed system.
  4. DO NOT OVER-PRESSURIZE RADIATORS:
    Most radiators are standard pressure construction. Standard pressure radiators should be tested with NO MORE THAN 50 PSI.
  5. Radiator Operating Pressure Ratings:
    Standard Pressure – 56 psi max (Tested at 74 psi)
    Medium Pressure – 85 psi max (Tested at 110 psi)
    High Pressure – 128 psi max (Tested at 184 psi)
  6. Radiators expand a maximum of 0.016 inch per linear foot of length if heated to 215°F. Piping attached to the radiator must provide the necessary expansion compensation.
  7. Flexible piping and elbowed piping are two simple ways to provide the 1/8 inch to 1/2 inch (typical) of flexibility required in expansion situations (usually series piping).
  8. Runtal Radiators require less flow rate than other hydronic heating products. If flow noise is apparent, balance the system until the noise is reduced.
  9. For a delta T of 20°F. (T supply minus T return), divide the total Btu/hr capacity of the loop by 10,000. This gives the Flow Rate in gallons per minute (GPM)
  10. Many levels of control are available today for hydronic systems. Runtal Radiators will provide nice, even heating whether operated by a simple thermostat to baseboard loop system, or an advanced boiler reset controller with motorized mixing valves, constant circulation and 2-pipe distribution.

Radiator Maintenance

  1. Hydronic system maintenance should include routine checks for piping leaks (usually indicated by frequent makeup water), and a yearly diagnosis of the system water pH to evaluate its corrosive potential.
  2. Internal radiator maintenance depends entirely on the system water makeup and proper venting. Hydronic system additives are available to passivate and protect against freezing. These additives will not significantly reduce the output of Runtal Radiators.
  3. External radiator maintenance consists of keeping the surfaces clean, and any paint nicks or deep scratches painted with touch-up to prevent any surface rust.
  4. Radiators can be painted after sanding with fine grit paper to dull the high gloss and by wiping with solvent or a tack rag. Use only oil-based enamel paint (alkyd, acrylic, urethane, epoxy) – do not use latex or lacquer paint. Use urethane or epoxy enamel for radiators located in harsh environments. Spray the paint to achieve an even coating, and let dry completely before heating the radiator.

Made-to-Order Wall Panels

Overview

   

  • Perfect replacement for cast iron radiators
• Ideal under windows–allows curtains to hang to the floor
• Allows more flexible furniture placement

Runtal’s wall panel style radiators are ideal for placement under windows or on walls where floor space is at a premium. When placed under windows, wall panels help eliminate cold spots and drafts, while allowing curtains to hang naturally to the floor. Simply choose the height and length that best suits your design and output requirements. Wall panels are available in lengths 20 inches to 29-1/2 feet in increments of 2 inches. Ten standard colors as well as an array of designer colors are available.

Wall panel radiators are available with or without fins. When hung, the radiators have the same appearance, however the addition of fins increases the output of the panels.

Available from 20 inches to 29-1/2 feet in width

 

      With Fins Without Fins
Number
of Tubes
Height Depth Model
Number
Heat
Output*
per ft.
Model
Number
Heat
Output*
per ft.
5 14.4″ 2″ VLX35/35 1240 BTUH VX35 700 BTUH
6 17.3″ 2″ VLX42/42 1430 BTUH VX42 840 BTUH
7 20.2″ 2″ VLX49/49 1620 BTUH VX49 990 BTUH
8 23.1″ 2″ VLX56/56 1810 BTUH VX56 1130 BTUH
9 26.1″ 2″ VLX63/56 1890 BTUH VX63 1280 BTUH
10 29″ 2″ VLX70/56 2020 BTUH VX70 1420 BTUH

*Outputs shown are figured at 180°F

Operation & Maintenance

Hydronic Radiator Operation

  1. Radiators are manufactured in the USA of cold rolled low carbon steel and should be used only in closed closed hydronic systems to assure no corrosion of any system components.
  2. Proper radiator operation depends on adequate flow of water to the panel, which can only be accomplished when all the system air has been fully vented from the panels.
  3. Radiators should each be vented, with the system pressurized but in a static state (pumps off). Venting may need to be done periodically to assure a closed system.
  4. DO NOT OVER-PRESSURIZE RADIATORS:
    Most radiators are standard pressure construction. Standard pressure radiators should be tested with NO MORE THAN 50 PSI.
  5. Radiator Operating Pressure Ratings:
    Standard Pressure – 56 psi max (Tested at 74 psi)
    Medium Pressure – 85 psi max (Tested at 110 psi)
    High Pressure – 128 psi max (Tested at 184 psi)
  6. Radiators expand a maximum of 0.016 inch per linear foot of length if heated to 215°F. Piping attached to the radiator must provide the necessary expansion compensation.
  7. Flexible piping and elbowed piping are two simple ways to provide the 1/8 inch to 1/2 inch (typical) of flexibility required in expansion situations (usually series piping).
  8. Runtal Radiators require less flow rate than other hydronic heating products. If flow noise is apparent, balance the system until the noise is reduced.
  9. For a delta T of 20°F. (T supply minus T return), divide the total Btu/hr capacity of the loop by 10,000. This gives the Flow Rate in gallons per minute (GPM)
  10. Many levels of control are available today for hydronic systems. Runtal Radiators will provide nice, even heating whether operated by a simple thermostat to baseboard loop system, or an advanced boiler reset controller with motorized mixing valves, constant circulation and 2-pipe distribution.

Radiator Maintenance

  1. Hydronic system maintenance should include routine checks for piping leaks (usually indicated by frequent makeup water), and a yearly diagnosis of the system water pH to evaluate its corrosive potential.
  2. Internal radiator maintenance depends entirely on the system water makeup and proper venting. Hydronic system additives are available to passivate and protect against freezing. These additives will not significantly reduce the output of Runtal Radiators.
  3. External radiator maintenance consists of keeping the surfaces clean, and any paint nicks or deep scratches painted with touch-up to prevent any surface rust.
  4. Radiators can be painted after sanding with fine grit paper to dull the high gloss and by wiping with solvent or a tack rag. Use only oil-based enamel paint (alkyd, acrylic, urethane, epoxy) – do not use latex or lacquer paint. Use urethane or epoxy enamel for radiators located in harsh environments. Spray the paint to achieve an even coating, and let dry completely before heating the radiator.

Made-to-Order Vertical Panels

Specifications

    

• Provides heat where floor space is limited
• Ideal for entryways and kitchens

Available from 20 inches to 29-1/2 feet in height

 

Number
of Tubes
Model
Number
Width Depth Heat
Output*
per ft
1 HX7 2.7″ 2″ 140 BTUH
2 HX14 5.7″ 2″ 280 BTUH
3 HX21 8.6″ 2″ 420 BTUH
4 HX28 11.5″ 2″ 560 BTUH
5 HX35 14.3″ 2″ 700 BTUH
6 HX42 17.3″ 2″ 840 BTUH
7 HX49 20.3″ 2″ 980 BTUH
8 HX56 23.1″ 2″ 1120 BTUH
9 HX63 26.1″ 2″ 1260 BTUH
10 HX70 29″ 2″ 1400 BTUH

 


*Outputs shown are figured at 180°F

Operation & Maintenance

Hydronic Radiator Operation

  1. Radiators are manufactured in the USA of cold rolled low carbon steel and should be used only in closed closed hydronic systems to assure no corrosion of any system components.
  2. Proper radiator operation depends on adequate flow of water to the panel, which can only be accomplished when all the system air has been fully vented from the panels.
  3. Radiators should each be vented, with the system pressurized but in a static state (pumps off). Venting may need to be done periodically to assure a closed system.
  4. DO NOT OVER-PRESSURIZE RADIATORS:
    Most radiators are standard pressure construction. Standard pressure radiators should be tested with NO MORE THAN 50 PSI.
  5. Radiator Operating Pressure Ratings:
    Standard Pressure – 56 psi max (Tested at 74 psi)
    Medium Pressure – 85 psi max (Tested at 110 psi)
    High Pressure – 128 psi max (Tested at 184 psi)
  6. Radiators expand a maximum of 0.016 inch per linear foot of length if heated to 215°F. Piping attached to the radiator must provide the necessary expansion compensation.
  7. Flexible piping and elbowed piping are two simple ways to provide the 1/8 inch to 1/2 inch (typical) of flexibility required in expansion situations (usually series piping).
  8. Runtal Radiators require less flow rate than other hydronic heating products. If flow noise is apparent, balance the system until the noise is reduced.
  9. For a delta T of 20°F. (T supply minus T return), divide the total Btu/hr capacity of the loop by 10,000. This gives the Flow Rate in gallons per minute (GPM)
  10. Many levels of control are available today for hydronic systems. Runtal Radiators will provide nice, even heating whether operated by a simple thermostat to baseboard loop system, or an advanced boiler reset controller with motorized mixing valves, constant circulation and 2-pipe distribution.

Radiator Maintenance

  1. Hydronic system maintenance should include routine checks for piping leaks (usually indicated by frequent makeup water), and a yearly diagnosis of the system water pH to evaluate its corrosive potential.
  2. Internal radiator maintenance depends entirely on the system water makeup and proper venting. Hydronic system additives are available to passivate and protect against freezing. These additives will not significantly reduce the output of Runtal Radiators.
  3. External radiator maintenance consists of keeping the surfaces clean, and any paint nicks or deep scratches painted with touch-up to prevent any surface rust.
  4. Radiators can be painted after sanding with fine grit paper to dull the high gloss and by wiping with solvent or a tack rag. Use only oil-based enamel paint (alkyd, acrylic, urethane, epoxy) – do not use latex or lacquer paint. Use urethane or epoxy enamel for radiators located in harsh environments. Spray the paint to achieve an even coating, and let dry completely before heating the radiator.

Design & Color Options

With a vibrant and varied palette, you can choose a shade that will blend into the background or add an eye-catching focal point to your room. Whether you’re decorating a neutral space, or you’re eager to inject character and color, there’s an ideal match for you.

You can choose from a range of standard colors or pay a little extra for a custom shade for your home. For custom color options please visit our Design Assistance and Custom Products Section where our team can help you find the exact match you are looking for.

View Color Options

Column Radiators

Overview

           

  • Ideal for floor-to-ceiling applications
• May be used as balustrade or knee-wall

Runtal column radiators are ideal for floor-to-ceiling applications and may also be used as a balustrade or knee-wall. Column radiators allow a view out. They may be either wall-mounted, or pedestal-mounted, away from the wall. They are available in lengths from 6 inches to 20 feet. Ten standard colors as well as an array of designer colors are available.

Available from 6 inches to 20 feet in length

 

Model
Number
Height Depth Heat
Output*
per ft
R1040-2 15.9″ 4″ 960 BTUH
R1060-2 23.6″ 4″ 1320 BTUH
R1075-2 29.5″ 4″ 1620 BTUH
R1090-2 35.6″ 4″ 1860 BTUH
R1200-2 78.8″ 4″ 4380 BTUH
R1215-2 84.6″ 4″ 4740 BTUH

*Outputs shown are figured at 180°F

Operation & Maintenance

Hydronic Radiator Operation

  1. Radiators are manufactured in the USA of cold rolled low carbon steel and should be used only in closed closed hydronic systems to assure no corrosion of any system components.
  2. Proper radiator operation depends on adequate flow of water to the panel, which can only be accomplished when all the system air has been fully vented from the panels.

  3. Radiators should each be vented, with the system pressurized but in a static state (pumps off). Venting may need to be done periodically to assure a closed system.

  4. DO NOT OVER-PRESSURIZE RADIATORS:
    Most radiators are standard pressure construction. Standard pressure radiators should be tested with NO MORE THAN 50 PSI.

  5. Radiator Operating Pressure Ratings:
    Standard Pressure – 56 psi max (Tested at 74 psi)
    Medium Pressure – 85 psi max (Tested at 110 psi)
    High Pressure – 128 psi max (Tested at 184 psi)

  6. Radiators expand a maximum of 0.016 inch per linear foot of length if heated to 215°F. Piping attached to the radiator must provide the necessary expansion compensation.

  7. Flexible piping and elbowed piping are two simple ways to provide the 1/8 inch to 1/2 inch (typical) of flexibility required in expansion situations (usually series piping).

  8. Runtal Radiators require less flow rate than other hydronic heating products. If flow noise is apparent, balance the system until the noise is reduced.

  9. For a delta T of 20°F. (T supply minus T return), divide the total Btu/hr capacity of the loop by 10,000. This gives the Flow Rate in gallons per minute (GPM)

  10. Many levels of control are available today for hydronic systems. Runtal Radiators will provide nice, even heating whether operated by a simple thermostat to baseboard loop system, or an advanced boiler reset controller with motorized mixing valves, constant circulation and 2-pipe distribution.


Radiator Maintenance

  1. Hydronic system maintenance should include routine checks for piping leaks (usually indicated by frequent makeup water), and a yearly diagnosis of the system water pH to evaluate its corrosive potential.

  2. Internal radiator maintenance depends entirely on the system water makeup and proper venting. Hydronic system additives are available to passivate and protect against freezing. These additives will not significantly reduce the output of Runtal Radiators.

  3. External radiator maintenance consists of keeping the surfaces clean, and any paint nicks or deep scratches painted with touch-up to prevent any surface rust.

  4. Radiators can be painted after sanding with fine grit paper to dull the high gloss and by wiping with solvent or a tack rag. Use only oil-based enamel paint (alkyd, acrylic, urethane, epoxy) – do not use latex or lacquer paint. Use urethane or epoxy enamel for radiators located in harsh environments. Spray the paint to achieve an even coating, and let dry completely before heating the radiator.

Curved & Segmented Radiators

Overview

  

  • Integrates into curved wall designs
• One-piece radiator for bay windows
• Template required — contact us for details  

For bay windows, or curved structures, accent the architecture with a dramatic curved radiator from Runtal. Template required.

High Output Radiators: Model Type VLX-VX

Heating Capacity

Model Type VLX-VX
BTUH/ft Ratings


VLX-VX-3 with Both Side & Vertical Connections – Shown for Example Only

Technical Data For All VLX-VX Models Is Included Below

MODEL
TYPE
HEIGHT
H
BTUH/FT OUTPUT @ LISTED AWT & 65°F EAT DRY WT
lbs/ft
215°F 190 180 170 160 150 140 130 120
                       

VLX 7/7 – VX7

2-3/4″ 979 769 689 612 537 465 395 327 263 3.6

VLX 14/14 – VX14

5-3/4″ 1589 1247 1118 993 872 754 640 531 427 6.9

VLX 21/21 – VX21

8-5/8″ 2019 1584 1421 1261 1108 958 813 675 542 10.1

VLX 28/28 – VX28

11-1/2″ 2417 1897 1701 1510 1326 1147 974 808 649 13.9

VLX 35/35 – VX35

14-3/8″ 3094 2498 2177 1933 1697 1457 1246 1034 831 16.8

VLX 42/42 – VX42

17-1/4″ 3470 2723 2443 2168 1904 1646 1398 1160 932 20.0

VLX 49/49 – VX49

20-1/4″ 3846 3018 2707 2403 2110 1824 1549 1286 1033 23.5

VLX 56/56 – VX56

23-1/8″ 4211 3304 2963 2631 2310 1997 1696 1408 1131 27.6

VLX 63/56 – VX63

26-1/8″ 4432 3478 3119 2769 2431 2102 1785 1481 1190 29.9

VLX 70/56 – VX70

29″ 4644 3645 3269 2901 2548 2203 1871 1552 1247 32.1

NOTE: Heat Outputs for various AWT’s include 15% Heat Effect for placement along outside walls. Use the 215° F Output Rating with the Correction Factor for more specific design conditions. Medium Pressure increases Dry Weight by 10%, High Pressure increases Dry Weight by 15%

Correction Factors

Correction Factors

EAT
AWT 45°F 50°F 55°F 60°F 65°F 70°F 75°F 80°F 85°F 90°F 95°F
240°F 1.365 1.350 1.304 1.266 1.220 1.171 1.124 1.086 1.039 1 0.953
235°F 1.343 1.305 1.267 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910
230°F 1.305 1.267 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868
225°F 1.267 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826
220°F 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785
215°F 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744
210°F 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704
205°F 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664
200°F 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625
195°F 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587
190°F 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549
185°F 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511
180°F 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474
175°F 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438
170°F 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403
165°F 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369
160°F 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334
155°F 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301
150°F 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269
145°F 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237
140°F 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207
135°F 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177
130°F 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149
125°F 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122
120°F 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096
115°F 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071
110°F 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071 0.50
105°F 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071 0.50 0.030
100°F 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071 0.50 0.030 0.011
 
EXAMPLE: To find the BTUH/ft Rating for an RF-4 Panel at 145°F AWT and 65°F EAT, Multiply the Correction Factor (0.438) by the BTUH/ft Rating at 215°F (1351), e.g. (0.438) X (1351) = 592 BTUH/ft

Correction Factors (PDF)

Flow Rates

How To Determine Flow Rates

The flow rate through a Runtal radiator (or series of radiators) is dependent on the length of the radiator (or combined length of the radiator series), and the design Entering Water Temperature (EWT) and the design Leaving Water Temperature (LWT).

The designer picks the design EWT and LWT. For example, he might pick 170°F as the EWT and 150°F as the LWT. The median point between these two temperatures is called the Average Water Temperature (AWT), and in this example the AWT is 160°F.

The Runtal Heating Capacity charts are based on the heating capacity per foot of radiator, based on the designer’s chosen AWT, and this heating capacity per foot is expressed in units of BTUH/FT @ a given AWT. The required flow rate (GPM) is figured as follows:

Flow Rate = (Heating Capacity/Foot X Radiator Length)

DT –LWT) X 500]

The (EWT – LWT) is commonly referred to as the “Delta T”, or “DT”.

Therefore, our Flow Rate formula becomes:

GPM = (BTUH/FT X FT of Radiator) DT (DT X 500)

As an example, let’s say our designer needs 445 BTUH/FT capacity, over a
10′-0″ span of wall, and has chosen the design water temperatures as EWT = 170°F, and LWT = 150°F. This means our AWT is 160°F. Looking in the Runtal type “R” radiator Heating Capacity chart, we see that an R-4 radiator gives us the required 445 BTUH/FT at 160°F AWT. Therefore, the required flow rate for the 10′-0″ long R-4 radiator is:

GPM = (445 BTUH/FT X 10FT) DT (20°F DT X 500) = 0.445 GPM

Note that there are various combinations of EWT and LWT that can result in the same AWT. In our example above, for instance, a 180°F EWT and a 140°F LWT result in the same 160°F AWT. With Runtal’s unique flattened water tube design, Delta T’s of up to 60°F are possible without concern that the flow rate is too low for heat transfer (see the “Design Tips” section for more information).

As for a maximum flow rate for Runtal radiators, we recommend no more that 1.5 GPM per water tube. For our R-4 example above, this would mean a maximum flow rate of 6 GPM for an opposite end piped radiator, or 3 GPM for a same end piped radiator (see the “Design Tips” section for more information).

 

Piping Options

Piping Options

A Type Connections

Type
Lefthand Supply
A Type
Righthand Supply

B Type Connections

Type
Lefthand Supply
B Type
Righthand Supply

C Type Connections

Type
Lefthand Supply
 Type
Righthand Supply

D Type Connections

Type
Lefthand Supply
D Type
Righthand Supply

Opposite End Series

NOTES:

  • Vent on each Panel
  • Can Eliminate Costly Risers
  • Lower PD than Same End Series
  • Up to 7 Radiators (100 ft) in Series Opposite End
  • Expansion Compensation Piping to be Provided by Others
Same End Series

NOTES:

  • Same AWT over the entire Same End Series
  • Can Eliminate Costly Risers
  • High PD than Opposite End Series
  • No More than 3 Radiators in Series Same End
  • Expansion Compensation Piping to be Provided by Others

Piping Options (PDF)

Piping Options: Type A (PDF)

Piping Options: Type B (PDF)

Piping Options: Type C & D (PDF)

Specifications

VLX-VX panel radiators are manufactured in the USA from cold rolled steel, and consist of two panels with two sets of fins. The panels are finished in a gloss powdercoat, and are available in many standard colors and over 100 optional colors. These panels are made in lengths from 2’-0” to 29’-6”, and heights from 3” to 29”. Standard piping connections are 1/2” NPT for inlet and outlet piping, and 1/8” NPT for vents (3/4” NPT inlets and outlets are available by special order). For more complete VLX-VX specifications, please refer to the Runtal technical pages.

BTUH/ft Ratings

Energy efficient as well as space saving, VLX-VX panels are both radiant and convective. These panels provide more comfort at a lower room temperature than convective heaters. Various average water temperatures (AWT) are shown here for convenience, but for more specific conditions use the appropriate correction factor with the 215°F rating. Please see the technical pages for the correction factor best suited to the design conditions.

BTUH/ft Ratings @ 65°F EAT

MODEL HEIGHT inches

DEPTH inches

215°F

180°F

140°F

VLX 7/7 – VX7

2.8

4.8*

980

689

395

VLX 14/14 – VX14

5.7

4.8*

1590

1118

640

VLX 21/21 – VX21

8.6

4.8*

2020

1421

813

VLX 28/28 – VX28

11.5

4.8*

2420

1701

974

VLX 35/35 – VX35

14.4

4.8*

3100

2177

1246

VLX 42/42 – VX42

17.3

4.8*

3470

2443

1398

VLX 49/49 – VX49

20.3

4.8*

3846

2707

1549

VLX 56/56 – VX56

23.1

4.8*

42112

2963

1696

VLX 63/56 – VX63

26.1

4.8*

4432

3119

1785

VLX 70/56 – VX70

29

4.8*

4644

3269

1871

* 3.4″ depth for pedestal mount radiators

Mounting Systems

VLX 21/21 – VX21
Wall mounting with a continuous mounting system (brackets included) is standard on all VLX-VX Panels. Free standing, cantilever and recessed wall mounting systems are also available. Please see the VLX-VX technical pages for more complete mounting details.

Wall Mounting

Model Type VLX-VX
Wall Mounting

VLX-VX Models (back view)
 

For Radiators

20″ to 60″ Long – Use 2 K11 Brackets, one at each end

62″ to 138″ Long – Use 3 K11 Brackets, one at each end, one at the center

140″ to 236″ Long – Use 4 K11 Brackets, one at each end, two distributed evenly in the middle
  238″ to 296″ Long – Use 5 K11 Brackets, one at each end, three distributed evenly in the middle
  298″ to 354″ Long – Use 6 K11 Brackets, one at each end, four distributed evenly in the middle
 

R clip – Mount to the grille back on the R Radiator at the K12 Positions

K12 Wall Bracket – Support Bracket used with R Radiators 

Normally shipped with the Radiators

K45 Offset Bolt – Carriage Bolt used at each weld nut at the bottom of the Radiator for leveling with the wall

Floor Mounting

Model Type VLX-VX
Floor Mounting

VLX-VX Models: VLX-VX-1, VLX-VX-2, VLX-VX-3 and VLX-VX-4 only (back view)
 

For Radiators

20″ to 60″ Long – Use 2 KR30 or KR20 Brackets, one within 12 inches of each end.

62″ to 138″ Long – Use 3 KR30 or KR20 Brackets, one at each end, one at the center

140″ to 236″ Long – Use 4 KR30 or KR20 Brackets, one at each end, two distributed evenly in the middle
  238″ to 296″ Long – Use 5 KR30 or KR20 Brackets, one at each end, three distributed evenly in the middle
  298″ to 354″ Long – Use 6 KR30 or KR20 Brackets, one at each end, four distributed evenly in the middle
 

High Output Radiators: Model Type VLX-2

Heating Capacity

Model Type VLX-2
BTUH/ft Ratings


VLX-2-3 with Both Side & Vertical Connections – Shown for Example Only

Technical Data For All VLX-2 Models Is Included Below

MODEL
TYPE
HEIGHT
H
BTUH/FT OUTPUT @ LISTED AWT & 65°F EAT DRY WT
lbs/ft
215°F 190 180 170 160 150 140 130 120
                       

VLX 7/7 – 2

2-3/4″ 1299 1020 914 812 713 616 523 434 349 4.3

VLX 14/14 – 2

5-3/4″ 2014 1581 1418 1258 1105 955 811 673 541 8.0

VLX 21/21 – 2

8-5/8″ 2572 2018 1810 1607 1411 1220 1036 860 691 11.7

VLX 28/28 – 2

11-1/2″ 3082 2418 2169 1925 1690 1462 1241 1030 828 16.4

VLX 35/35 – 2

14-3/8″ 3788 2973 2666 2367 2078 1797 1526 1266 1017 19.6

VLX 42/42 – 2

17-1/4″ 4263 3345 3000 2663 2338 2022 1717 1425 1145 23.2

VLX 49/49 – 2

20-1/4″ 4738 3718 3335 2960 2599 2247 1909 1584 1273 27.4

VLX 56/56 – 2

23-1/8″ 5200 4080 3660 3248 2852 2466 2095 1738 1396 32.5

VLX 63/56 – 2

26-1/8″ 5451 4278 3836 3405 2990 2585 2196 1822 1464 34.7

VLX 70/56 – 2

29″ 5691 4466 4005 3556 3122 2699 2293 1902 1528 36.9

NOTE: Heat Outputs for various AWT’s include 15% Heat Effect for placement along outside walls. Use the 215° F Output Rating with the Correction Factor for more specific design conditions. Medium Pressure increases Dry Weight by 10%, High Pressure increases Dry Weight by 15%

Correction Factors

Correction Factors

EAT
AWT 45°F 50°F 55°F 60°F 65°F 70°F 75°F 80°F 85°F 90°F 95°F
240°F 1.365 1.350 1.304 1.266 1.220 1.171 1.124 1.086 1.039 1 0.953
235°F 1.343 1.305 1.267 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910
230°F 1.305 1.267 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868
225°F 1.267 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826
220°F 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785
215°F 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744
210°F 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704
205°F 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664
200°F 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625
195°F 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587
190°F 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549
185°F 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511
180°F 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474
175°F 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438
170°F 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403
165°F 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369
160°F 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334
155°F 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301
150°F 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269
145°F 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237
140°F 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207
135°F 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177
130°F 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149
125°F 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122
120°F 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096
115°F 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071
110°F 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071 0.50
105°F 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071 0.50 0.030
100°F 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071 0.50 0.030 0.011
 
EXAMPLE: To find the BTUH/ft Rating for an RF-4 Panel at 145°F AWT and 65°F EAT, Multiply the Correction Factor (0.438) by the BTUH/ft Rating at 215°F (1351), e.g. (0.438) X (1351) = 592 BTUH/ft

Correction Factors (PDF)

Flow Rates

How To Determine Flow Rates

The flow rate through a Runtal radiator (or series of radiators) is dependent on the length of the radiator (or combined length of the radiator series), and the design Entering Water Temperature (EWT) and the design Leaving Water Temperature (LWT).

The designer picks the design EWT and LWT. For example, he might pick 170°F as the EWT and 150°F as the LWT. The median point between these two temperatures is called the Average Water Temperature (AWT), and in this example the AWT is 160°F.

The Runtal Heating Capacity charts are based on the heating capacity per foot of radiator, based on the designer’s chosen AWT, and this heating capacity per foot is expressed in units of BTUH/FT @ a given AWT. The required flow rate (GPM) is figured as follows:

Flow Rate = (Heating Capacity/Foot X Radiator Length)

DT –LWT) X 500]

The (EWT – LWT) is commonly referred to as the “Delta T”, or “DT”.

Therefore, our Flow Rate formula becomes:

GPM = (BTUH/FT X FT of Radiator) DT (DT X 500)

As an example, let’s say our designer needs 445 BTUH/FT capacity, over a
10′-0″ span of wall, and has chosen the design water temperatures as EWT = 170°F, and LWT = 150°F. This means our AWT is 160°F. Looking in the Runtal type “R” radiator Heating Capacity chart, we see that an R-4 radiator gives us the required 445 BTUH/FT at 160°F AWT. Therefore, the required flow rate for the 10′-0″ long R-4 radiator is:

GPM = (445 BTUH/FT X 10FT) DT (20°F DT X 500) = 0.445 GPM

Note that there are various combinations of EWT and LWT that can result in the same AWT. In our example above, for instance, a 180°F EWT and a 140°F LWT result in the same 160°F AWT. With Runtal’s unique flattened water tube design, Delta T’s of up to 60°F are possible without concern that the flow rate is too low for heat transfer (see the “Design Tips” section for more information).

As for a maximum flow rate for Runtal radiators, we recommend no more that 1.5 GPM per water tube. For our R-4 example above, this would mean a maximum flow rate of 6 GPM for an opposite end piped radiator, or 3 GPM for a same end piped radiator (see the “Design Tips” section for more information).

Piping Options

Piping Options

A Type Connections

Type
Lefthand Supply
A Type
Righthand Supply

B Type Connections

Type
Lefthand Supply
B Type
Righthand Supply

C Type Connections

Type
Lefthand Supply
 Type
Righthand Supply

D Type Connections

Type
Lefthand Supply
D Type
Righthand Supply

Opposite End Series

NOTES:

  • Vent on each Panel
  • Can Eliminate Costly Risers
  • Lower PD than Same End Series
  • Up to 7 Radiators (100 ft) in Series Opposite End
  • Expansion Compensation Piping to be Provided by Others

Same End Series

NOTES:

  • Same AWT over the entire Same End Series
  • Can Eliminate Costly Risers
  • High PD than Opposite End Series
  • No More than 3 Radiators in Series Same End
  • Expansion Compensation Piping to be Provided by Others

Piping Options (PDF)

Piping Options: Type A (PDF)

Piping Options: Type B (PDF)

Piping Options: Type C & D (PDF)

Specifications

VLX 14/14 – 2
VLX-2 panel radiators are manufactured in the USA from cold rolled steel and consist of two panels with three sets of fins. The panels are finished in a gloss powdercoat, and are available in many standard colors and over 100 optional colors. These panels are made in lengths from 2’-0” to 29’- ”, and heights from 3” to 29”. Standard piping connections are 1/2” NPT for inlet and outlet piping, and 1/8” NPT for vents (3/4” NPT inlets and outlets are available by special order). For more complete VLX-2 specifications, please refer to the Runtal technical pages.

BTUH/ft Ratings

Energy efficient as well as space saving, VLX-2 panels are both radiant and convective. These panels provide more comfort at a lower room temperature than convective heaters. Various average water temperatures (AWT) are shown here for convenience, but for more specific conditions use the appropriate correction factor with the 215°F rating. Please see the technical pages for the correction factor best suited to the design conditions.
BTUH/ft Ratings @ 65°F EAT
MODEL HEIGHT inches DEPTH inches 215°F 180°F 140°F

VLX 7/7 – 2

2.8 4.8 1300 920  530

VLX 14/14 – 2

5.7 4.8 2020 1420 820

VLX 21/21 – 2

8.6 4.8 2580 1810 1040

VLX 28/28 – 2

11.5 4.8 3090 2170 1250

VLX 35/35 – 2

14.4 4.8 3790 2670 1530

VLX 42/42 – 2

17.3 4.8 4270 3000 1720

VLX 49/49 – 2

20.2 4.8 4738 3335 1909

VLX 56/56 – 2

23.1 4.8 5200 3660 2095

VLX 63/56 – 2

26.0 4.8 5451 3836 2196

VLX 70/56 – 2

29.0 4.8 5691 4005 2293

Mounting Systems

VLX 21/21 – 2
Wall mounting with a continuous mounting system (brackets included) is standard on all VLX-2 panels. Free standing, cantilever and recessed wall mounting systems are also available. Please see the VLX-2 technical pages for more complete mounting details.

Wall Mounting

Model Type VLX-2
Wall Mounting

VLX-2 Models (back view)
 

For Radiators

20″ to 60″ Long – Use 2 K12 Brackets, one at each end

62″ to 138″ Long – Use 3 K12 Brackets, one at each end, one at the center

140″ to 236″ Long – Use 4 K12 Brackets, one at each end, two distributed evenly in the middle
  238″ to 296″ Long – Use 5 K12 Brackets, one at each end, three distributed evenly in the middle
  298″ to 354″ Long – Use 6 K12 Brackets, one at each end, four distributed evenly in the middle
 

R clip – Mount to the Cutouts on the RF Radiator at the K12 Positions

K12 Wall Bracket – Support Bracket used with RF Radiators 

Normally shipped with the Radiators

K45 Offset Bolt – Carriage Bolt used at each weld nut at the bottom of the Radiator for leveling with the wall

Floor Mounting

Model Type VLX-2
Floor Mounting

VLX-2 Models: VLX-2-1, VLX-2-2, VLX-2-3 and VLX-2-4 only (back view)
 

For Radiators

20″ to 60″ Long – Use 2 KR30 or KR20 Brackets, one within 12 inches of each end

62″ to 138″ Long – Use 3 KR30 or KR20 Brackets, one at each end, one at the center

140″ to 236″ Long – Use 4 KR30 or KR20 Brackets, one at each end, two distributed evenly in the middle
  238″ to 296″ Long – Use 5 KR30 or KR20 Brackets, one at each end, three distributed evenly in the middle
  298″ to 354″ Long – Use 6 KR30 or KR20 Brackets, one at each end, four distributed evenly in the middle

Hot Spring Radiators

Overview

 

 

 

Model:
Height:
Diameter:
Depth:

HOT 60
25.6″
7.8″
11.0″

HOT 180
72.8″
7.8″
11.0″


Heat Output:

Hydronic
Heat Output @180°F
1975* BTUH 6681* BTUH
*chrome finish reduces radiator output by 20%
Pair of chrome angle shut-off valves included

BTUH Calculations

Calculating BTUH Output for Different Water Temperatures

The BTUH outputs are listed for 180° water. The following chart may be used to calculate the BTUH outputs for different water temperatures:

Water Temperature Multiply the Listed BTUH output (180°) by:
120° 0.38
130° 0.48
140° 0.57
150° 0.67
160° 0.78
170° 0.89
180° 1
190° 1.13

To size the radiators it is necessary to calculate a house’s heating requirement.  This calculation measured in BTU/Hour should be done on a room-by-room basis either by a heating contractor or qualified plumber. The following are some estimates of Heat Requirements for Sample Cities:

City:  BTUH per sq. foot:
Boston 40
Chicago 40
Denver 40
New York City 40
Philadelphia 35
Portland, OR 25
San Francisco 25
Seattle 25
Toronto 40
Washington, D.C. 35

Colors & Finishes

Flow Form Radiators

Overview

 

The industrial heating element appears as a beautiful object in its own right. Flow Form’s spiral fin, designed for technical efficiency, adds a dramatic twist to modern living.

 

 

Model:
Length:
Height:
Diameter:

XFF 100
39.4″
7.5″
5.2″

XFF 150
59.1″
7.5″
5.2″

XFF 200
78.8″
7.5″
5.2″


Heat Output:

Hydronic
Heat Output @180°F
2553* BTUH 3920* BTUH 5288* BTUH
*chrome finish reduces radiator output by 12%
Pair of chrome angle shut-off valves included

BTUH Calculations

Calculating BTUH Output for Different Water Temperatures

The BTUH outputs are listed for 180° water. The following chart may be used to calculate the BTUH outputs for different water temperatures:

Water Temperature Multiply the Listed BTUH output (180°) by:
120° 0.38
130° 0.48
140° 0.57
150° 0.67
160° 0.78
170° 0.89
180° 1
190° 1.13

To size the radiators it is necessary to calculate a house’s heating requirement.  This calculation measured in BTU/Hour should be done on a room-by-room basis either by a heating contractor or qualified plumber. The following are some estimates of Heat Requirements for Sample Cities:

City:  BTUH per sq. foot:
Boston 40
Chicago 40
Denver 40
New York City 40
Philadelphia 35
Portland, OR 25
San Francisco 25
Seattle 25
Toronto 40
Washington, D.C. 35

 

Colors & Finishes

Design & Planning

Runtal heating products can blend into a traditional décor, highlight an ultra-modern design, or accent any style in between. From baseboard style, to wall panels, to fancy curves and dramatic room dividers, Runtal manufactures the perfect welded steel radiator for every application. Since Runtal manufactures an almost unlimited selection of sizes, colors, and heat outputs. Runtal is truly a designer’s dream. Innovation in architectural detail is no longer held hostage to “old rules” of mechanical heating systems. Imagine the possibilities, confident that the final design will be comfortable and stylish.

Store

Purchase any of our handcrafted stocked Runtal White radiators directly from the factory, for quick delivery, or choose from a variety of 9 standard colors for 2-week delivery.

Design Assistance & Custom Products

Runtal Radiators can be custom designed to fit your exact specifications. Choose from an endless variety of colors, including select metallic finishes. Our experts will assist you with finding the exact size, heat capacity and décor your are looking for.