EOS Mythos S35 Freestanding Electric Sauna Heater
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EOS Mythos S35 Electric Sauna Heater
The EOS Mythos S35 is a premium freestanding electric sauna heater created for modern residential and commercial sauna rooms. Its geometric Bauhaus-inspired form, distinctive pedestal base and Cubius stone system give the heater a sculptural appearance while delivering powerful traditional Finnish sauna performance.
Choose a 7.5 kW or 9 kW heater in Anthracite, Black, Stainless Steel or White. Electrical configurations are available for 208V three-phase or 240V two-phase service.
Architectural Design Meets Traditional Sauna Performance
The Mythos S35 is designed for sauna rooms where the heater is an important part of the visual experience. Its slim freestanding body, uniform appearance on all sides and elevated pedestal create a refined floating effect.
The heater is especially well suited for installation near glass walls or in open sauna layouts. A large internal stone compartment provides approximately 77 pounds of stone capacity for heat storage, efficient convection and satisfying steam production.
Award-Winning Design
The distinctive geometric exterior and pillar-style base create a contemporary centerpiece for premium sauna rooms.
Cubius Stone System
Included Cubius stones conceal the traditional sauna stones below and complete the Mythos heater’s architectural appearance.
All-Sided Finish
The uniform appearance supports placement near glass panels, against a wall or in a central sauna location.
Premium Materials and Space-Saving Construction
Stainless Steel Construction
The durable outer and inner construction is made from stainless steel for long-term residential or commercial sauna use.
Four Finish Options
Choose Anthracite, Black, Stainless Steel or White to coordinate the heater with the sauna’s interior design.
77-Pound Stone Capacity
The large rock store supports heat retention, consistent convection and effective water evaporation.
Included Cubius Stones
The Cubius stone kit and mounting frame are included with the heater for its signature geometric appearance.
Slim 14.6-Inch Depth
The narrow floor-standing design preserves usable sauna space without sacrificing stone capacity or visual presence.
Service-Friendly Layout
The stone compartment is positioned above the heating elements to support airflow and easier service access.
Select the Finish, Output and Electrical Service
| Product Option | Available Selections |
|---|---|
| Finish | Anthracite, Black, Stainless Steel or White |
| Heater Output | 7.5 kW or 9 kW |
| Voltage / Phase | 208V / 3PH AC / 60 Hz or 240V / 2PH AC / 60 Hz |
| Installation | Freestanding floor installation |
Confirm electrical service before ordering: The 208V three-phase and 240V two-phase heaters are different electrical configurations. A qualified electrician should verify the building service, control system and branch-circuit requirements before the variant is selected.
Choose 7.5 kW or 9 kW
Select heater output according to the usable interior volume of the sauna. Final sizing must also account for insulation, ceiling height, ventilation and heat loss from glass, tile, masonry and other non-insulated surfaces.
| Heater Output | Recommended Sauna Volume | Published Floor Area at 6.2-Foot Height |
|---|---|---|
| 7.5 kW | Approximately 280 to 420 cu. ft. | Approximately 45.2 to 67.8 sq. ft. |
| 9 kW | Approximately 313 to 494 cu. ft. | Approximately 50.5 to 79.7 sq. ft. |
The published sizing ranges overlap. Sauna rooms in the overlapping range should be evaluated according to insulation, glass area, desired heat-up speed and expected frequency of use.
Coordinate the Mythos S35 With Your Sauna Design
Anthracite
A deep charcoal finish that complements contemporary woods, dark fixtures and architectural sauna interiors.
Black
A matte-black finish with a bold, minimalist appearance suited to modern glass-front sauna rooms.
Stainless Steel
A brushed metal appearance that highlights the heater’s premium stainless steel construction.
White
A clean matte-white finish that creates a striking contrast with natural sauna woods and darker interiors.
Product photography, lighting and screen settings can affect how finishes appear. Confirm the selected finish before placing the order.
Complete the EOS Mythos Sauna System
The Mythos S35 does not include a built-in control. A compatible external EOS sauna control and correctly configured power equipment are required for operation.
Required: EOS Sauna Control
Select a control that matches the heater’s voltage, phase and output.
Required: EOS Power Box
The appropriately configured Power Box provides the electrical switching interface between the external control and sauna heater.
Included: Sauna Stones
The package includes approximately 77 pounds of stones, including the Cubius stone kit and traditional sauna stones.
Required: Professional Installation
Electrical connections, sensors, ventilation, heater placement and control wiring must be completed by qualified professionals.
Compatibility matters: The EOS control, Power Box and supporting electrical components must match the selected 208V three-phase or 240V two-phase heater configuration.
A Signature Geometric Stone Presentation
The included Cubius stones sit on a dedicated mounting frame above the main rock store. This arrangement conceals the traditional sauna stones beneath and creates the distinctive geometric appearance associated with the Mythos collection.
Cubius Stones Included
The standard package includes the Cubius stone set and mounting frame designed for the Mythos S35.
Traditional Stones Below
The internal rock store holds the primary sauna stones used for heat retention and steam production.
Optional Stone Designs
Additional Cubius heights, colors and Loop-style arrangements may be available as optional accessories.
Designed for Open and Glass-Front Sauna Rooms
The Mythos S35 has a consistent finish on all sides, making it suitable for sauna layouts where the heater is visible from multiple directions.
Near Glass Panels
The finished rear and side surfaces allow the heater to complement transparent walls without exposing an unfinished back panel.
Open Sauna Layouts
The sculptural pedestal design supports open placement when all clearances and guard-rail requirements are maintained.
Space-Saving Depth
At approximately 14.6 inches deep, the S35 offers a substantial stone capacity without occupying excessive floor space.
Optional Guard-Rail Brackets
Finish-matched four-sided mounting brackets are available for constructing an appropriate wooden heater guard rail.
EOS Mythos S35 Specifications
| Heater Type | Freestanding electric sauna heater |
|---|---|
| Sauna Type | Traditional dry Finnish sauna |
| Available Outputs | 7.5 kW and 9 kW |
| Available Electrical Configurations | 208V / 3PH AC / 60 Hz and 240V / 2PH AC / 60 Hz |
| Available Finishes | Anthracite, Black, Stainless Steel and White |
| Outer Construction | Stainless steel with selected decorative finish |
| Inner Construction | Stainless steel |
| Rock Store | Stainless steel, positioned above the heating elements |
| Dimensions | Approximately 33.1 in H × 16.5 in W × 14.6 in D |
| Stone Capacity | Approximately 77 lbs |
| Cubius Stones | Standard Cubius stone kit included |
| Weight Without Stones | Approximately 74 lbs |
| Recommended Sauna Volume | Approximately 280 to 494 cu. ft., depending on output |
| Installation | Freestanding floor installation |
| Minimum Side Clearance | Approximately 1.6 inches, subject to all manual requirements |
| Minimum Sauna Height | Approximately 6.23 feet |
| Minimum Ceiling Clearance | Approximately 35.4 inches above the heater |
| Terminal Box | Recessed stainless steel terminal box |
| Ingress Protection | IPX4 |
| Control | Compatible external EOS sauna control required |
| Country of Manufacture | Germany |
| Manufacturer Warranty | 2 years, subject to manufacturer terms |
Specifications are provided for preliminary planning. Verify dimensions, clearances, wiring requirements, sensor placement and installation details in the official EOS documentation before construction or electrical work begins.
Electrical Requirements by Configuration
The Mythos S35 is available for either 208V three-phase or 240V two-phase electrical service. Electrical installation must be completed by a qualified electrician according to the EOS manual and applicable codes.
| Heater Output | Electrical Configuration | Published Fuse Protection | Published Minimum Copper Conductor |
|---|---|---|---|
| 7.5 kW | 208V / 3PH AC / 60 Hz | 40 A | 10 AWG |
| 7.5 kW | 240V / 2PH AC / 60 Hz | 50 A | 12 AWG |
| 9 kW | 208V / 3PH AC / 60 Hz | 35 A | 10 AWG |
| 9 kW | 240V / 2PH AC / 60 Hz | 50 A | 8 AWG |
The manufacturer’s technical table presents fuse and conductor values in paired 208V and 240V columns. The installing electrician must confirm the correct interpretation, circuit design, conductor size, disconnect and overcurrent protection for the selected heater and control configuration.
Coordinate the Heater, Cabin and Control System
Step 1
Calculate Sauna Volume
Measure the usable interior and account for glass, tile, masonry and other surfaces that increase heat loss.
Step 2
Confirm Electrical Service
Determine whether the installation requires the 208V three-phase or 240V two-phase heater variant.
Step 3
Select the Control System
Match the chosen heater output and electrical configuration with a compatible EOS control and Power Box.
Step 4
Complete Professional Installation
Have the wiring, sensors, ventilation, safety equipment and commissioning completed by qualified professionals.
Maintain a Safe Freestanding Installation
The Mythos S35 becomes extremely hot during operation. Install it on a stable, level and heat-resistant surface that can support the heater and its full stone load.
- Maintain the required clearance from every adjacent wall and combustible surface.
- Maintain at least approximately 35.4 inches between the heater and a horizontal ceiling surface.
- Install a suitable heater guard rail around accessible sides.
- Do not install the heater on easily flammable laminate or synthetic flooring.
- Ceramic tile or another appropriate heat-resistant surface is recommended.
- Do not install the heater beneath a bench, inside an alcove or beneath a sloping roof.
- Never place towels, clothing, cleaning supplies or other objects on the heater.
Proper Airflow Supports Safe, Consistent Heating
The sauna cabin must include correctly sized fresh-air intake and exhaust openings. Insufficient ventilation can reduce performance and create an overheating hazard.
| Heater Output | Published Minimum Air Inlet and Outlet |
|---|---|
| 7.5 kW | Approximately 13.8 in × 2 in |
| 9 kW | Approximately 13.8 in × 2.4 in |
Air openings may be installed below or behind the heater approximately 2 to 3.9 inches above the floor. Exhaust openings should generally be positioned low on the opposite wall. Follow the EOS manual and cabin manufacturer’s instructions for the final design.
Load the Stone System for Airflow and Performance
The Mythos S35 includes traditional sauna stones and the signature Cubius stone system. Each stone type must be installed in its intended location.
Traditional Sauna Stones
- Rinse dust and loose debris from the stones before loading.
- Place the stones loosely in the internal rock store.
- Maintain spaces that allow heated air to circulate.
- Do not wedge stones tightly against the heating elements.
Cubius Stones
- Install the Cubius mounting frame according to the manual.
- Place the Cubius stones securely on the frame.
- Confirm that no stone can fall from the heater.
- Replace damaged or unstable stones before operating the sauna.
Do not operate the heater without the required stones. Incorrect stone placement may restrict airflow, reduce performance or shorten heating-element life.
Create Traditional Finnish Sauna Steam
After the sauna stones have reached operating temperature, small controlled amounts of clean water may be poured over the stones to create steam.
- Use only clean water suitable for sauna use.
- Apply water in controlled amounts.
- Do not flood the heater or pour excessive water at one time.
- Do not use water containing salt, chlorine or damaging contaminants.
- Use sauna fragrances only when properly diluted and used as directed.
- Never place fragrance containers or other objects on the heater.
Protect Long-Term Heater Performance
Inspect the Stones
Rearrange the traditional stones periodically to maintain airflow. Replace cracked, crumbling or deteriorated stones.
Check Cubius Stones
Inspect the Cubius stones and mounting frame to confirm that every piece remains stable and undamaged.
Clean the Exterior
Allow the heater to cool completely before cleaning. Avoid abrasive products that could damage the selected finish.
Use Qualified Service Personnel
Internal repairs, electrical troubleshooting and heating-element replacement must be completed by qualified professionals.
What Is Included
Included With the Heater
- EOS Mythos S35 heater in the selected configuration
- Cubius stone mounting frame
- Cubius stone kit
- Traditional sauna stones
- Approximately 77 pounds of total stone filling
- Manufacturer documentation
Sold Separately
- Compatible EOS sauna control
- Compatible EOS Power Box
- Wooden heater guard rail
- Optional finish-matched guard-rail brackets
- Electrical wiring and installation materials
- Optional remote-connectivity and safety equipment
Download EOS Mythos S35 Technical Information
Review both manufacturer documents with your sauna designer, builder and electrician before ordering or beginning installation.
EOS Mythos S35 Data Sheet
Review dimensions, finish options, heater outputs, electrical configurations, room sizing, clearances and stone capacity.
EOS Mythos Installation and Operating Manual
Review safety requirements, cabin preparation, ventilation, electrical connections, stone loading, commissioning, operation and maintenance.
Support for Your Complete Sauna System
Configuration Guidance
We can help coordinate the finish, heater output, voltage and phase with compatible EOS control equipment.
Complete-System Support
Purchase the heater, control equipment and compatible supporting components through one knowledgeable wellness retailer.
Veteran-Owned Business
My Luxury Home Spa is a veteran-owned company committed to responsive service, clear communication and long-term customer support.
Choose Your EOS Mythos S35
Select your preferred finish, 7.5 kW or 9 kW output, and the correct electrical configuration. Contact My Luxury Home Spa for help coordinating the heater with the appropriate EOS control and Power Box.
EOS Mythos S35 FAQs
What is the EOS Mythos S35?
The EOS Mythos S35 is a freestanding designer electric sauna heater with a geometric stainless steel body, pillar-style pedestal and included Cubius stone system. It is available in 7.5 kW and 9 kW outputs.
What finish options are available?
The Mythos S35 is available in Anthracite, Black, Stainless Steel or White.
What heater outputs are available?
The Mythos S35 is available in 7.5 kW and 9 kW configurations.
What voltage and phase options are available?
The manufacturer-supported electrical configurations are 208V three-phase AC and 240V two-phase AC, both at 60 Hz.
Is a 208V two-phase model available?
The official EOS data sheet lists 208V three-phase and 240V two-phase configurations. It does not list a 208V two-phase model.
Which heater size do I need?
- 7.5 kW: approximately 280 to 420 cubic feet
- 9 kW: approximately 313 to 494 cubic feet
Final sizing also depends on insulation, glass area, ventilation, ceiling height and other heat-loss factors.
Why do the sizing ranges overlap?
Overlapping ranges allow the final heater selection to account for construction, glass area, desired heat-up time and usage patterns instead of room volume alone.
Are sauna stones included?
Yes. The heater includes approximately 77 pounds of total stone filling, including traditional sauna stones and the Cubius stone kit.
What are Cubius stones?
Cubius stones are geometric decorative stones installed on a mounting frame above the main rock store. They conceal the traditional stones beneath and create the Mythos heater’s distinctive appearance.
Can different Cubius stones be added?
Optional Cubius stone variations, including different heights and Loop arrangements, may be available separately.
What are the heater dimensions?
The Mythos S35 measures approximately 33.1 inches high, 16.5 inches wide and 14.6 inches deep.
How much does the heater weigh?
The heater weighs approximately 74 pounds without stones. The included stone filling adds approximately 77 pounds.
Can the heater be installed near a glass wall?
Yes. Its uniform finish on all sides makes it well suited for installation near glass panels when all required clearances are maintained.
Can the Mythos S35 be installed in the center of a sauna?
Yes. Its finished all-sided exterior supports open or central placement when the required guard rail, ventilation and clearances are provided.
Does the heater require a guard rail?
An appropriate heater guard rail should be installed around accessible sides. Optional finish-matched mounting brackets are available, but the wooden guard rail is sold separately.
Can the Mythos S35 be installed under a bench?
No. It is a freestanding exposed heater and is not designed for installation beneath a bench, in an alcove or beneath a sloping roof.
Does the heater include a built-in control?
No. A compatible external EOS sauna control and properly configured EOS Power Box are required.
Which EOS controls can be used?
Compatible control families include appropriately configured EOS Touch 3 and EOS EmoTec systems. The control and Power Box must match the selected heater output, voltage and phase.
Can smartphone control be added?
Remote connectivity may be available when the heater is paired with an eligible EOS control and compatible EOS connectivity equipment. Approved remote-start safety equipment may also be required.
Can water be poured over the stones?
Yes. Once the stones are fully heated, small controlled amounts of clean water may be poured over them to create traditional sauna steam.
Can the heater be installed on laminate flooring?
No. The manual warns against installation on easily flammable flooring such as laminate or synthetic materials. A suitable heat-resistant surface such as ceramic tile is recommended.
How should the sauna stones be maintained?
Inspect and rearrange the traditional stones periodically to maintain airflow. Replace cracked or deteriorated stones and verify that the Cubius stones remain stable.
Can I install the heater myself?
The heater must be installed according to the official EOS instructions. Fixed electrical connections, control wiring and commissioning must be completed by a qualified electrician.
What is included with the heater?
The package includes the selected EOS Mythos S35 heater, traditional sauna stones, Cubius stone kit, mounting frame and manufacturer documentation. The control system and guard rail are sold separately.
What warranty does the Mythos S35 include?
The EOS Mythos S35 includes a two-year manufacturer warranty, subject to manufacturer terms, proper installation, intended use and required maintenance.
Why Buy From Us
FAQs
Shipping & Delivery
Free shipping available on select orders. White-glove delivery and setup can be arranged at an additional cost in most areas. We'll confirm your preferred date after purchase.
Warranty
Full manufacturer warranty, registered at purchase. Need help with a claim? Our U.S. support team handles it directly with the brand.
Returns
New, uninstalled items can be returned within the brand's policy window. We'll help coordinate pickup and any restocking requirements.
Installation & Power
Most saunas/hot tubs require dedicated circuits. We provide spec sheets and can recommend licensed installers in your area.
