EOS Power Extension Box for Multi-Heater Sauna Systems
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Expand a Compatible EOS Control System to Operate Multiple Sauna Heaters
The EOS Power Extension Box adds the relay capacity required when an EOS sauna installation includes more heaters than the primary multi-heater Power Box can control by itself.
Available in five configurations, the Power Extension Box works with compatible EOS Touch 3 and EmoTec D control systems. Select Small, Medium, Large, L-XL, or X-Large according to the number of additional relay boards required by the complete heater and electrical design.
Purpose-Built Expansion for Large Multi-Heater Sauna Installations
The EOS Power Extension Box, also called the PEB NA, is a power switching expansion component for sauna systems that operate several electric heaters from one compatible EOS control platform.
Each additional relay board supports another heater circuit within the approved system design. The available variants provide one, two, three, or four additional relay boards. The largest PEB NA 5 configuration includes four relay boards plus a separate Power Box that allows the system to expand beyond six total relay boards.
The Power Extension Box is not required for a standard single-heater sauna and cannot be used as a stand-alone control or as a substitute for the primary EOS multi-heater Power Box.
- Brand
- EOS
- Model
- PEB NA Power Extension Box
- Product type
- Power switching and relay expansion unit
- Application
- Multi-heater sauna systems
- Control compatibility
- EOS Touch 3 and EmoTec D
- Required Power Box
- EOS multi-heater Power Box
- Available sizes
- Small, Medium, Large, L-XL, X-Large
- Maximum system
- Up to 12 relay boards
Flexible Relay Expansion for Complex Sauna Heating Systems
The five available configurations allow a qualified system designer to match the extension equipment to the exact number of heater circuits required.
Built for Multiple Heaters
Provides additional switching capacity when several sauna heaters must operate through one compatible EOS control system.
Scalable Relay Capacity
Choose a configuration with one, two, three, or four additional relay boards based on the approved electrical and heater plan.
Five Shopify Variants
Available as Small, Medium, Large, L-XL, and X-Large to represent the five EOS PEB NA configurations.
Compatible with EOS Touch 3
Integrates with a properly configured EOS Touch 3 system and the required multi-heater Power Box.
Compatible with EmoTec D
Also supports approved multi-heater systems using the EOS EmoTec D control platform.
Large-System Expansion
Supported configurations can include up to 12 relay boards when the correct primary Power Box, PEB NA 5, and additional PEB are combined.
Selected by Circuit Design
The correct variant is determined by heater quantity, heater output, voltage, phase, relay requirements, and the complete EOS system plan.
Purpose-Built Integration
Designed specifically for connection to the main board and relay boards used within approved EOS multi-heater control systems.
Engineered by EOS
Designed and engineered as part of the EOS professional sauna control and heater ecosystem.
Choose the Correct Power Extension Box for Your EOS Multi-Heater System
The Power Extension Box is selected according to the complete heater design, electrical configuration, and number of required relay boards. It is not selected by sauna room size. Your electrician or sauna designer should determine the proper configuration based on the complete EOS system layout.
| Shopify Variant | EOS Model | Additional Relay Boards | Typical Application |
|---|---|---|---|
| Small | PEB NA 1 Small | 1 | Small multi-heater systems requiring one additional relay board. |
| Medium | PEB NA 2 Small | 2 | Medium multi-heater commercial sauna installations. |
| Large | PEB NA 3 | 3 | Larger commercial systems requiring three expansion relay boards. |
| L-XL | PEB NA 4 | 4 | Large commercial heater installations requiring four relay boards. |
| X-Large | PEB NA 5 | 4 relay boards plus additional Power Box | Very large commercial installations supporting relay boards 7 through 12. |
Need help selecting the correct version? Contact us with your EOS control model, heater model(s), heater kW, voltage, electrical phase, and total heater quantity. We'll help you identify the correct Power Extension Box configuration before you order.
When Is an EOS Power Extension Box Required?
Most residential sauna installations use a single heater and do not require a Power Extension Box. The PEB is intended for larger systems where additional heater circuits must be controlled beyond the capacity of the primary EOS multi-heater Power Box.
Usually Not Required
- Single-heater residential saunas
- Most standard home sauna installations
- Small traditional saunas
- Most infrared sauna systems
Often Required
- Commercial wellness facilities
- Large multi-heater sauna rooms
- Hotels and resorts
- Luxury spa installations
- Large custom sauna projects
- Systems requiring additional relay boards
The Power Extension Box Is Only One Part of a Complete EOS Control System
The Power Extension Box cannot operate by itself. It expands the switching capacity of an approved EOS multi-heater control system.
Required Components
- Compatible EOS Touch 3 or EmoTec D control
- Compatible EOS Power Box / relay box
- Compatible EOS sauna heaters
- Properly sized electrical service
- Qualified electrician
- Correctly sized Power Extension Box
- EOS communication wiring
Sold Separately
- Touch 3 control
- Relay / Power Box
- App Module
- Bench sensor
- Floor sensor
- Wall sensor
- Humidity sensor
- Extension cables
- Lighting module
- Sound module
- Sauna heater(s)
- Electrical installation
Common Ordering Mistakes
The EOS Power Extension Box is frequently misunderstood. It does not replace several other important components in an EOS sauna control system.
The Power Extension Box Is NOT...
- a touchscreen controller
- a relay box replacement
- a Wi-Fi module
- an App Module
- a heater controller
- a transformer
- a complete electrical control package
- a stand-alone control system
It IS...
- additional relay capacity
- part of a multi-heater system
- used with compatible EOS controls
- used with a primary Power Box
- intended for larger commercial installations
- professionally installed equipment
Compatible EOS Products
These products are commonly used together in larger EOS commercial sauna installations.
Already Available
EOS Touch 3 Digital Sauna Control EOS App ModuleAdditional EOS Components
EOS Relay Box EOS Bench Sensor EOS Floor Sensor EOS Wall Sensor EOS Humidity Sensor EOS Extension CableEOS Power Extension Box Models and Relay Capacity
Each size corresponds to a specific EOS PEB NA configuration. Select the model based on the approved number of additional relay boards required for the complete multi-heater system.
| Size | EOS Model | SKU | Included Relay Capacity | Additional Power Supply |
|---|---|---|---|---|
| Small | PEB NA 1 Small | 14-949279 | 1 relay board | No |
| Medium | PEB NA 2 Small | 14-949280 | 2 relay boards | No |
| Large | PEB NA 3 | 14-949281 | 3 relay boards | No |
| L-XL | PEB NA 4 | 14-949282 | 4 relay boards | No |
| X-Large | PEB NA 5 | 14-949283 | Expansion power supply for relay boards 7 through 12 | Yes |
Important: The X-Large PEB NA 5 configuration provides the additional power supply used when expanding a system beyond six relay boards. It does not replace the separate relay boards required to reach the final circuit count.
Technical Overview
The Power Extension Box is designed exclusively to increase the switching capacity of a compatible EOS sauna control system operating electric sauna heaters inside a sauna cabin.
| Manufacturer | EOS Saunatechnik GmbH |
|---|---|
| Product type | Power switching and relay expansion component |
| Series | PEB NA |
| Application | Additional switching capacity for compatible multi-heater electric sauna systems |
| Compatible control platforms | Compatible North American EOS EmoTec and EmoTouch control systems configured for multi-heater operation |
| Primary Power Box requirement | Compatible EOS multi-heater Power Box required |
| Available configurations | PEB NA 1 Small, PEB NA 2 Small, PEB NA 3, PEB NA 4, and PEB NA 5 |
| Maximum supported relay boards | Up to 12 relay boards when configured according to the EOS system design |
| Connection | Connection to the main board of the compatible Power Box and designated relay-board connections |
| Installation | Installation and electrical connection by a qualified, appropriately skilled person only |
| Heater protection requirement | External temperature cutout, or TCO, required for each sauna heater |
| Intended location | Installed as part of the approved sauna control and electrical system according to the EOS installation manual |
| Intended use | Electric sauna heaters in sauna cabins only |
Technical requirements may vary according to the heater output, voltage, phase, control model, Power Box, relay arrangement, and applicable electrical codes. The final system must be designed and approved before ordering components.
How the Power Extension System Expands
The primary multi-heater Power Box begins the system with its own relay capacity. A Power Extension Box then adds relay boards according to the number of additional heater circuits required.
Start with the Primary Power Box
The compatible multi-heater Power Box provides the main connection point and the first relay boards in the EOS control system.
Add the Required Relay Boards
Select a Small, Medium, Large, or L-XL Power Extension Box based on the number of additional heater relay boards needed.
Use PEB NA 5 Beyond Six Relays
Systems requiring relay boards 7 through 12 use the PEB NA 5 expansion power supply together with the required additional relay-board configuration.
Do not calculate the required model from heater quantity alone. Some heater outputs and electrical configurations may require different relay arrangements. Follow the approved EOS system design and the instructions supplied with the control and heaters.
Expanding an EOS System to 12 Relay Boards
Bathing Brands identifies the following combination as an example of the maximum 12-relay-board configuration.
Primary Power Unit
The compatible primary multi-heater Power Box provides the first two relay boards.
PEB NA 5 System
The PEB NA 5 provides the expansion power supply used for the second group of relay boards, together with four relay boards.
Additional PEB Capacity
A PEB NA 4 and PEB NA 2 provide six additional relay boards, bringing the system total to 12.
This is an equipment-configuration example, not a universal wiring plan. Heater capacity, voltage, phase, branch circuits, conductor sizing, protection devices, TCO requirements, and local electrical codes must be addressed by the qualified professionals responsible for the project.
How the EOS Control Components Work Together
Each component performs a different function. A Power Extension Box does not replace the touchscreen control, primary Power Box, sensors, or optional remote-connectivity equipment.
| Component | Primary Function | Included with PEB? |
|---|---|---|
| EOS Touch 3 | Provides the user interface and control commands for the compatible sauna system. | No |
| EOS Power Box | Houses the primary control electronics and heater-switching components. | No |
| EOS Power Extension Box | Adds relay capacity for additional heaters in a compatible multi-heater system. | This product |
| EOS App Module | Adds supported mobile-device connectivity to a compatible EOS control system. | No |
| EOS Sensors | Monitor required sauna conditions and provide information to the control system. | No |
| External TCO | Provides the required external temperature cutout protection for each sauna heater. | No |
What Is Included
Package contents depend on the selected PEB NA configuration.
Small Through L-XL
- Selected EOS PEB NA relay-board configuration
- Model-specific connection components supplied by EOS
- Installation documentation
X-Large
- EOS PEB NA 5 expansion power supply
- Model-specific connection components supplied by EOS
- Installation documentation
Verify package requirements before ordering. The control, primary multi-heater Power Box, heaters, external TCO devices, sensors, field wiring, circuit protection, and professional installation are not included unless expressly listed with the selected product variant.
Installation Manual
Review the EOS manual with the sauna designer and electrician before selecting, installing, connecting, or servicing the Power Extension Box.
EOS Power Extension Box Installation Manual
Includes model identification, scope of delivery, connection diagrams, relay-board configuration examples, and installation requirements.
Installation and Electrical Planning
The Power Extension Box is a professional electrical component. Connection must be completed only by a qualified and appropriately skilled person in accordance with the EOS documentation, the manuals for the control and heaters, and all applicable electrical codes.
Design the Complete System
Confirm the heater models, heater quantities, voltage, phase, total load, primary Power Box, relay-board requirements, sensors, external TCO devices, and control model.
Select the Correct PEB
Match the Small, Medium, Large, L-XL, or X-Large configuration to the approved relay-board plan. Do not select the model from room size or total heater quantity alone.
Install and Commission
A qualified professional must make the electrical connections, verify heater protection, test the complete control system, and commission the sauna before use.
External TCO required: The EOS manual states that an external temperature cutout is required for each sauna heater connected within the system.
Information Needed to Confirm the Correct Configuration
Having the following project information available will help prevent incorrect component selection and installation delays.
Heater Information
- Exact heater model
- Quantity of heaters
- Rated output of each heater
- Required external TCO equipment
Electrical Information
- Available voltage
- Electrical phase
- Total connected load
- Branch-circuit design
Control Information
- EOS control model
- Primary Power Box model
- Number of required relay boards
- Existing or new installation
Support for Complex EOS Sauna Projects
Multi-heater sauna systems require careful coordination between the control, Power Box, extension equipment, heaters, sensors, protection devices, and electrical design. My Luxury Home Spa helps customers identify the information needed before placing an order.
Preorder Guidance
We can review the supplied control, heater, and electrical information to help identify which EOS components should be confirmed for the project.
Compatible Components
Shop related EOS controls, connectivity modules, sensors, heater accessories, and system components from one specialty retailer.
Veteran-Owned Business
My Luxury Home Spa is a veteran-owned business focused on premium home, commercial, and hospitality wellness equipment.
Select the Correct EOS Power Extension Box
Choose Small, Medium, Large, L-XL, or X-Large only after confirming the required relay capacity with the sauna designer, EOS system documentation, and qualified electrician.
EOS Power Extension Box FAQ
Review these answers before selecting a Power Extension Box for an EOS multi-heater sauna control system.
What does the EOS Power Extension Box do?
The EOS Power Extension Box adds relay capacity to a compatible EOS multi-heater sauna control system. It allows the system to operate additional heater circuits beyond the capacity provided by the primary multi-heater Power Box.
Is the Power Extension Box a complete sauna controller?
No. The Power Extension Box is not a stand-alone controller. It must be used as part of a compatible EOS system that includes the appropriate control panel, primary Power Box, heaters, sensors, protection devices, and electrical components.
Which size options are available?
The available Shopify variants are Small, Medium, Large, L-XL, and X-Large. These correspond to the EOS PEB NA 1 Small, PEB NA 2 Small, PEB NA 3, PEB NA 4, and PEB NA 5 configurations.
How do I choose the correct Power Extension Box size?
The correct size is based on the approved number of additional relay boards required by the complete sauna system. Selection should account for the heater models, heater outputs, voltage, phase, control model, primary Power Box, total connected load, and electrical design.
Do not choose the Power Extension Box from sauna room dimensions alone.
Is the Power Extension Box selected by sauna room size?
No. Sauna room size may influence the heater design, but the Power Extension Box itself is selected according to the required relay configuration and complete electrical system plan.
What is included with the Small Power Extension Box?
The Small variant corresponds to the EOS PEB NA 1 Small configuration and provides one additional relay board for an approved compatible system.
What is included with the Medium Power Extension Box?
The Medium variant corresponds to the EOS PEB NA 2 Small configuration and provides two additional relay boards for an approved compatible system.
What is included with the Large Power Extension Box?
The Large variant corresponds to the EOS PEB NA 3 configuration and provides three additional relay boards for an approved compatible system.
What is included with the L-XL Power Extension Box?
The L-XL variant corresponds to the EOS PEB NA 4 configuration and provides four additional relay boards for an approved compatible system.
What is different about the X-Large Power Extension Box?
The X-Large variant corresponds to the EOS PEB NA 5. It provides the additional expansion power supply used when a system extends beyond six relay boards and supports relay-board positions seven through twelve.
The final configuration may require additional relay boards and extension equipment beyond the PEB NA 5 itself.
How many relay boards can a complete EOS system support?
A properly configured EOS multi-heater system can support up to twelve relay boards when the required primary Power Box, Power Extension Boxes, relay boards, wiring, and control components are combined according to the EOS documentation.
Do most residential saunas need a Power Extension Box?
No. Most residential sauna installations use one heater and do not require this component. The Power Extension Box is generally used in larger custom or commercial multi-heater systems.
Can I use the Power Extension Box with a single sauna heater?
It is generally unnecessary for a standard single-heater system. The component is designed to provide additional relay capacity for approved multi-heater installations.
Is the EOS Touch 3 control included?
No. The compatible touchscreen control is sold separately. View the EOS Touch 3 Digital Sauna Control for additional information.
Is the primary EOS Power Box included?
No, unless it is expressly identified as part of a specific package. A compatible primary multi-heater Power Box is required for the Power Extension Box to function.
Does the Power Extension Box replace the primary Power Box?
No. It expands the primary Power Box. It does not replace the main control electronics or the primary heater-switching equipment.
Is the EOS App Module included?
No. Mobile connectivity requires a separately purchased compatible EOS App Module and supported EOS control system.
Are sauna heaters included?
No. Sauna heaters are sold separately and must be selected as part of the complete room, heating, control, and electrical design.
Are sensors included?
Required temperature, bench, wall, floor, humidity, or other system sensors are not included unless expressly stated in the selected package. Sensor requirements depend on the control, heater, and sauna configuration.
Is an external temperature cutout required?
Yes. The EOS installation documentation states that an external temperature cutout, commonly called a TCO, is required for each sauna heater in the system.
Can the Power Extension Box be installed by the homeowner?
No. This is professional electrical equipment. Installation, wiring, testing, and commissioning must be completed by a qualified and appropriately skilled person in accordance with the EOS manuals and applicable electrical codes.
Does the product include electrical wiring and circuit protection?
Field wiring, branch circuits, disconnects, breakers, conductor sizing, electrical panels, and other installation materials are not included unless specifically stated. These must be determined by the qualified professionals responsible for the project.
Can one Power Extension Box operate any number of heaters?
No. Each configuration provides a defined amount of relay capacity. The heater and relay arrangement must remain within the limitations of the selected EOS equipment and the approved system design.
Can the Power Extension Box be added to an existing sauna?
It may be possible when the existing control system, Power Box, heaters, wiring, sensors, and electrical service are compatible. A qualified sauna and electrical professional should evaluate the existing installation before components are purchased.
Where can I find the installation instructions?
The EOS Power Extension Box Instructions and Operation Manual is available in the Product Documents section of this page.
What information should I provide before requesting selection help?
Provide the exact EOS control model, primary Power Box model, heater models, heater quantity, rated output of each heater, voltage, phase, total connected load, number of required relay boards, and whether the project is a new or existing installation.
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