EOS sauna heater specs
EOS Invisio Midi is a purpose-built concealed heater for indoor Finnish saunas. The 45.7 in-wide body sits below a removable bench behind a site-built dividing wall and hot-air shaft, while the supplied protective grille, special wall sensor, ventilation openings, service path, and infusion plumbing remain part of the safety assembly. SaunaDesignPro models the complete system—not an exposed floor heater hidden cosmetically by a bench.
EOS Invisio Midi is a 6, 9, or 12 kW North American concealed heater for roughly 214-634 cu ft rooms. Every size uses the same 1160 × 380 mm body, about 44-45 lb of stones, a 1240 mm mandatory grille, 1900 mm minimum room height, a removable under-bench assembly, and a compatible EOS Touch 3 or EmoTec D control/power package.
Design with EOS Invisio Midi Buy EOS Invisio Midi at Sauna Marketplace
No. It needs the EOS manual-defined dividing wall and hot-air shaft, a removable bench/service route, the supplied 1240 mm protective grille, exact air paths, a noncombustible floor, and the special sensor location. A normal bench simply placed over a floor heater is not compliant.
The North American line has 6.0, 9.0, and 12.0 kW bodies in stainless steel or anthracite. The 6 and 9 kW sizes have 208V 3PH and 240V 2-line item numbers; 12 kW is 208V 3PH only.
The heater is 1160 × 380 mm and adjusts to 710 or 770 mm installed height. Plan the supplied 1240 × 100 mm grille, at least 40 mm beyond each heater end, a 45 mm rear spacer, 105 mm shaft offset, and more than 30/60 mm upper/lower air paths.
Center the required EOS sensor with safety-temperature limiter on the cabin wall above the heater, 100 mm below the protective grille. Do not use the generic ceiling-sensor location.
Plan a matching North American EOS Touch 3 or EmoTec D control and power box outside the hot room, plus the required sensor/limiter. The heater body is not a complete operating package.
No. The factory grille is a mandatory part of the installation. It bridges the cabin wall and dividing-wall/shaft edge to keep objects from falling onto the concealed heater.
Use non-closable inlet and outlet openings, with the outlet low on the diagonally opposite wall, and design for at least five air changes per hour. Minimum opening sizes are 350 × 50 mm at 6 kW, 350 × 60 mm at 9 kW, and 350 × 70 mm at 12 kW.
Not as a generic design. The North American manual scope is indoor Finnish dry sauna use, protected from weather, condensation, and corrosive conditions. Alcove or sloped-roof details require EOS review of the exact assembly.
Pour water only into the infusion trough. The internal water channel must slope away from the chosen left- or right-hand hose connection, and the hose needs a continuous downhill, kink-free route. Treat the trough as a hot surface.
The complete heater must slide out without dismantling permanent cabin equipment. Provide removable bench and dividing-wall panels, electrical and hose slack, and a clear removal route at least as large as the heater envelope.
Plan approximately 20.5 kg / 44-45 lb of loose natural sauna stones, about 100-150 mm / 2-4 in. Confirm the current EOS kit at order time because distributor stone-package copy is not fully consistent.
| Variant | Power | Room volume | Dimensions | Rocks | Side/back | Front | Minimum ceiling | Controller |
|---|---|---|---|---|---|---|---|---|
| Invisio Midi 6.0Invisio Midi 6.0 | 6 kW | 214-280 cu ft | 45.7" W x 15" D x 30.3" H | 45 lb | 1.57" | 1.18" | 74.8" | EOS Touch 3 or EmoTec D with matching North American power box and sensor/safety limiter |
| Invisio Midi 9.0Invisio Midi 9.0 | 9 kW | 314-494 cu ft | 45.7" W x 15" D x 30.3" H | 45 lb | 1.57" | 1.18" | 74.8" | EOS Touch 3 or EmoTec D with matching North American power box and sensor/safety limiter |
| Invisio Midi 12.0Invisio Midi 12.0 | 12 kW | 494-634 cu ft | 45.7" W x 15" D x 30.3" H | 45 lb | 1.57" | 1.18" | 74.8" | EOS Touch 3 or EmoTec D with matching North American power box and sensor/safety limiter |
EOS Invisio Midi North America installation manual
source: EOS Invisio Midi North America installation manual, data sheet, distributor attachments, imagery, and custom model record (6/9/12 kW NA planning data and item numbers reviewed 2026-07-13; custom protected GLB and construction assembly drawings derived from the 1160 × 380 mm manual envelope; checked July 13, 2026)
Floor-standing
Floor-standing sizes use their own body height and top clearance.
Invisio Midi 6.0 / Invisio Midi 9.0 / Invisio Midi 12.0
Useful when the store name and manual model number are not identical.
214-634 cu ft
Use adjusted sauna volume after cold surfaces, not just geometric room volume.
53-60 lb
Listed body weight before stones; verify shipping weight with the final SKU.
Use the current SaunaDesignPro heater-sizing source
The calculator applies the brand-family coefficient before selecting a heater size.
74.8"
Computed from body height, floor clearance, top clearance, and the manual minimum room height.
Not listed for these sizes
Verify with the selected manual when designing unusually tall rooms.
208V 3PH AC 60 Hz, 240V 2-line AC 60 Hz; EOS Touch 3 or EmoTec D with matching North American power box and sensor/safety limiter / 208V 3PH AC 60 Hz; EOS Touch 3 or EmoTec D with matching North American power box and sensor/safety limiter
Use the selected kW row and SKU when matching breakers, phases, relays, and controller packages.
Concealed under-bench heater: use only inside the manual-defined dividing-wall/hot-air-shaft assembly with the supplied protective grille installed Keep the complete heater removable: provide removable bench panels, cable and hose slack, and a service route at least as large as the heater envelope
10 more notes shown below.
45 mm rear spacer · 105 mm shaft offset · 10/30/60 mm air-path rules
The custom bench/dividing wall and supplied grille are functional safety components; preserve them in plan, elevation, 3D, BOM, and submittal views.
Centered above heater, 100 mm below grille
The generic ceiling sensor location does not apply to Invisio Midi.
Complete heater removable without permanent-cabin demolition
Use removable panels and preserve cable, hose, terminal-box, and body extraction access.
350 × 50 / 60 / 70 mm for 6 / 9 / 12 kW
Keep inlet and low diagonal outlet non-closable and provide at least five air changes per hour.