EOS Invisio Midi Concealed Under-Bench Electric Sauna Heater
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EOS Invisio Midi 208/3 Electric Sauna Heater
The EOS Invisio Midi 208/3 is a concealed electric sauna heater designed for installation beneath the sauna benches. Its space-saving construction keeps the heater largely out of view while delivering traditional Finnish sauna heat for rooms up to approximately 634 cubic feet.
Choose a Stainless Steel or Anthracite finish and select 6 kW, 9 kW or 12 kW output. All available models on this product page are configured for 208V three-phase commercial electrical service.
Powerful Sauna Heat With the Heater Concealed Below the Bench
The Invisio Midi is engineered for sauna rooms where preserving usable space and maintaining a clean interior design are priorities. The heater installs beneath the seating area behind a properly constructed dividing wall, keeping the hot unit separated from bathers.
Its low-profile layout requires only approximately four inches between the heater and the screen wall. The concealed installation creates more flexibility for bench planning while reducing the chance of accidental contact with the hot heater surface.
Concealed Installation
The heater installs beneath the sauna benches behind a properly designed screen or dividing wall.
Traditional Steam
An included water-infusion system allows water to be directed safely across the heated stones.
Space-Saving Design
The low-profile construction preserves visible floor area and supports more flexible bench layouts.
Designed for Safety, Space and Traditional Sauna Performance
Included Safety Grill
The protective top grill helps prevent objects from falling directly onto the heater and is an integral required part of the installation.
Included Water-Infusion Set
A stainless steel funnel and distribution system allow water to be applied to the stones even though the heater is concealed below the benches.
Optimized Heating Elements
The heating elements are arranged to support efficient airflow and faster sauna heat-up performance.
Adjustable Height
Adjustable feet provide approximately 2.4 inches of height adjustment to help coordinate the heater with the bench and screen-wall construction.
Select Your Invisio Midi Configuration
| Product Option | Available Selections |
|---|---|
| Finish | Stainless Steel or Anthracite |
| Heater Output | 6 kW, 9 kW or 12 kW |
| Electrical Configuration | 208V / 3PH AC / 60 Hz |
Important: Voltage and phase are not selectable options on this product page. Every model is configured for 208V three-phase electrical service. Confirm the building’s electrical service before ordering.
Choose 6 kW, 9 kW or 12 kW
Select the heater output according to the usable interior volume of the sauna cabin. 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 | Typical Application |
|---|---|---|
| 6 kW | Approximately 213 to 280 cu. ft. | Smaller commercial or institutional sauna rooms |
| 9 kW | Approximately 313 to 494 cu. ft. | Medium commercial sauna rooms |
| 12 kW | Approximately 494 to 634 cu. ft. | Larger commercial sauna rooms |
Sauna room sizes between approximately 281 and 312 cubic feet fall between the published 6 kW and 9 kW sizing ranges. Contact My Luxury Home Spa or your sauna designer for model-selection guidance before ordering.
Complete the EOS Invisio Midi Sauna System
The Invisio Midi does not include a built-in control. A compatible external EOS sauna control, appropriately rated EOS Power Box and sauna stones are required for a complete operating system.
Required: EOS Sauna Control
Choose a compatible EOS control with the appropriate output rating for the selected heater.
Required: EOS Power Box
The appropriately rated Power Box provides the electrical switching interface between the external sauna control and the heater.
Required: Sauna Stones
The Invisio Midi requires approximately 44 pounds of properly sized sauna stones suitable for electric sauna heaters.
Required: Professional Installation
The cabin construction, dividing wall, ventilation, electrical system and control equipment must be installed by qualified professionals.
Control sizing matters: The control and Power Box must support the selected heater output. The 12 kW heater requires equipment rated for more than 9 kW. Confirm the full system configuration before ordering.
Enjoy Traditional Sauna Steam With a Concealed Heater
Because the heater is hidden beneath the benches, water is not poured directly onto the heater from above. Instead, water is poured into the included stainless steel funnel.
The connected hose and internal distribution gutter direct the water across the width of the heated stone compartment, creating the traditional burst of steam associated with Finnish sauna bathing.
Stainless Steel Funnel
The visible funnel provides a convenient location for applying water from inside the sauna cabin.
Distribution Gutter
The internal stainless steel gutter spreads water across the heater instead of concentrating it in one location.
Traditional Steam Experience
Controlled amounts of clean water can be used after the stones have reached operating temperature.
Durable Materials for Concealed Commercial Installation
| Component | Construction |
|---|---|
| Outer Housing | Zinc-plated steel |
| Inner Housing | Zinc-plated steel |
| Top Cover | Stainless steel |
| Feet | Stainless steel with adjustable height |
| Water-Infusion Gutter | Stainless steel |
| Terminal Box | Recessed into the side panel |
| Protective Grill | Included and required for installation |
EOS Invisio Midi 208/3 Specifications
| Heater Type | Concealed under-bench electric sauna heater |
|---|---|
| Sauna Type | Traditional dry Finnish sauna |
| Available Outputs | 6 kW, 9 kW and 12 kW |
| Electrical Configuration | 208V / 3PH AC / 60 Hz |
| Available Finishes | Stainless Steel and Anthracite |
| Dimensions | Approximately 28 to 30.3 in H × 45.7 in W × 15 in D |
| Height Adjustment | Approximately 2.4 inches |
| Stone Capacity | Approximately 44 lbs |
| Weight Without Stones | Approximately 53 lbs for 6 kW, 55 lbs for 9 kW and 60 lbs for 12 kW |
| Recommended Sauna Volume | Approximately 213 to 634 cu. ft., depending on heater output |
| Installation | Concealed beneath sauna benches behind a dividing or screen wall |
| Minimum Screen-Wall Gap | Approximately 4 inches, subject to the complete installation requirements |
| Control Type | Compatible external EOS sauna control required |
| Power Equipment | Appropriately rated compatible EOS Power Box required |
| Water-Infusion System | Included stainless steel funnel, hose and distribution components |
| Protective Grill | Included and required |
| Country of Manufacture | Germany |
| Manufacturer Warranty | 2 years, subject to manufacturer terms |
Published dimensions and sizing information are provided for preliminary planning. Verify all required measurements, clearances, ventilation openings, conductor sizes and installation details in the official EOS manual before construction begins.
Coordinate the Heater With the Bench and Cabin Design
The Invisio Midi is not installed like a conventional exposed sauna heater. Its concealed position requires advance coordination between the sauna designer, carpenter and electrician.
Step 1
Confirm Sauna Size
Calculate usable interior volume and account for glass, tile, masonry and other heat-loss surfaces.
Step 2
Plan the Bench Layout
Provide the required space beneath the benches and construct the screen wall according to EOS requirements.
Step 3
Select the Control System
Match the heater output with a compatible 208V three-phase EOS control and appropriately rated Power Box.
Step 4
Complete Professional Installation
Have the electrical connections, ventilation, sensors and safety components installed and commissioned by qualified professionals.
Required Protection for Under-Bench Installation
The included protective grill is an integral part of the heater and must be installed. It helps prevent objects from falling onto the hot heater from the bench area above.
A properly constructed screen or dividing wall must also separate the heater from the occupied sauna area. The dividing wall, bench structure and heater placement must maintain all clearances shown in the official installation manual.
- Install the included protective grill in every installation.
- Construct the dividing wall using appropriate sauna materials.
- Maintain the required gap between the heater and screen wall.
- Do not block heated-air movement around the heater.
- Keep towels, cleaning materials and other objects away from the heater compartment.
- Provide access for inspection, cleaning and future service.
Correct Airflow Is Essential
The sauna cabin must include properly sized fresh-air intake and exhaust openings. Insufficient airflow may cause poor performance, overheating or unsafe operating conditions.
| Heater Output | Published Minimum Ventilation Opening |
|---|---|
| 6 kW | Approximately 13.8 in × 2 in |
| 9 kW | Approximately 13.8 in × 2.4 in |
| 12 kW | Approximately 13.8 in × 2.8 in |
Ventilation placement must follow the EOS manual and the sauna cabin manufacturer’s instructions. Intake and exhaust openings must remain unobstructed during operation.
Proper Stone Loading Supports Airflow and Heater Life
The Invisio Midi requires approximately 44 pounds of properly sized sauna stones approved for use with electric sauna heaters.
Before Loading
- Rinse dust and loose debris from the stones.
- Allow excess water to drain before installation.
- Remove cracked, soft or crumbling stones.
During Loading
- Place stones loosely between and around the heating elements.
- Maintain open spaces for heated air to circulate.
- Do not wedge stones tightly against the elements.
- Do not operate the heater without the required stones.
Inspect and rearrange the stones regularly. Replace stones that crack, crumble or significantly reduce airflow through the heater.
What Is Included
Included With the Heater
- EOS Invisio Midi 208/3 heater in the selected finish and output
- Required protective safety grill
- Water-infusion funnel
- Water-infusion hose and distribution components
- Adjustable feet
- Manufacturer documentation
Sold Separately
- Compatible EOS sauna control
- Appropriately rated EOS Power Box
- Approximately 44 pounds of sauna stones
- Electrical wiring and installation materials
- Sauna benches and dividing-wall materials
- Optional remote-connectivity and safety equipment
Download EOS Invisio Midi Technical Information
Review the manufacturer documents with your sauna designer, builder and electrician before ordering or beginning construction.
EOS Invisio Midi Data Sheet
Review heater dimensions, power options, cabin-sizing ranges, ventilation requirements, connection details and delivery scope.
EOS Invisio Midi Installation and Operating Manual
Review cabin requirements, clearances, under-bench construction, electrical installation, commissioning, operation, cleaning and maintenance.
Support for Your Complete Sauna System
Configuration Guidance
We can help match the heater output with the correct EOS control and appropriately rated Power Box.
Complete-System Support
Purchase the heater, control equipment and compatible supporting components from one knowledgeable wellness-equipment 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 Invisio Midi 208/3
Select Stainless Steel or Anthracite and choose the 6 kW, 9 kW or 12 kW model for your sauna room. Contact My Luxury Home Spa for help coordinating the heater with the correct EOS control and Power Box.
EOS Invisio Midi 208/3 FAQs
What is the EOS Invisio Midi 208/3?
The EOS Invisio Midi 208/3 is a concealed electric sauna heater designed for installation beneath the sauna benches. It operates on 208V three-phase power and is available in 6 kW, 9 kW and 12 kW outputs.
Is voltage or phase selectable?
No. Every heater on this product page is configured for 208V / 3PH AC / 60 Hz. The selectable options are finish and heater output only.
Where is the Invisio Midi installed?
The heater installs beneath the sauna benches behind a properly constructed screen or dividing wall. The included protective grill and all manufacturer clearances must be maintained.
Which heater output do I need?
- 6 kW: approximately 213 to 280 cubic feet
- 9 kW: approximately 313 to 494 cubic feet
- 12 kW: approximately 494 to 634 cubic feet
Final sizing also depends on insulation, glass area, ceiling height, ventilation and other heat-loss factors.
Why is there a gap between the published 6 kW and 9 kW sizing ranges?
The manufacturer publishes 213 to 280 cubic feet for the 6 kW model and 313 to 494 cubic feet for the 9 kW model. Sauna rooms between those ranges require professional sizing based on their specific construction and heat-loss characteristics.
Does glass affect heater sizing?
Yes. Glass doors, glass walls, tile, masonry and other non-insulated surfaces increase heat loss and may require more heating capacity than the room’s basic interior volume suggests.
What finishes are available?
The EOS Invisio Midi is available in Stainless Steel or Anthracite. The finish does not change the heater’s output or operating performance.
How large is the heater?
The heater is approximately 45.7 inches wide, 15 inches deep and adjustable from approximately 28 to 30.3 inches high.
How much space is required between the heater and screen wall?
The manufacturer identifies a space-saving installation requiring approximately four inches between the heater and the screen wall. All additional clearances and construction requirements in the installation manual must also be followed.
Is the protective grill optional?
No. The included protective grill is an integral part of the heater and must be installed. It helps prevent objects from falling onto the hot heater.
Can water still be used on a concealed heater?
Yes. The included water-infusion system uses a stainless steel funnel, hose and internal distribution gutter to direct water across the heated stones.
Are sauna stones included?
No. The heater requires approximately 44 pounds of properly sized sauna stones, which are sold separately unless specifically stated otherwise.
Does the heater include a built-in control?
No. A compatible external EOS sauna control and appropriately rated EOS Power Box are required.
Which EOS controls are compatible?
Compatible control families include appropriately configured EOS Touch 3 and EOS EmoTec systems. The control and Power Box must match the 208V three-phase electrical configuration and selected heater output.
Does the 12 kW model require a higher-capacity control system?
Yes. A control or Power Box rated only for 9 kW is not sufficient for a 12 kW heater. The 12 kW model must be paired with an appropriately rated control and power unit.
Can the Invisio Midi be connected to standard residential power?
This product page is for the 208V three-phase model, which is generally used in buildings with compatible commercial electrical service. An electrician must verify the available voltage and phase before purchase.
Can smartphone control be added?
Remote access 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 the heater be installed without a dividing wall?
No. The concealed installation requires the appropriate under-bench layout, screen or dividing wall, protective grill and manufacturer clearances.
Can I install the heater myself?
The heater and cabin construction must follow the official EOS instructions. Fixed electrical connections, control wiring and commissioning must be completed by a qualified electrician.
How should the sauna stones be maintained?
Inspect and rearrange the stones periodically to maintain airflow. Replace stones that are cracked, crumbling or significantly deteriorated.
What is included with the heater?
The package includes the selected heater, required protective grill, water-infusion components, adjustable feet and manufacturer documentation. Controls, power equipment, stones and construction materials are sold separately.
What warranty does the Invisio Midi include?
The EOS Invisio Midi includes a two-year manufacturer warranty, subject to the manufacturer’s terms, proper installation, compatible system configuration, 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.
