EOS sauna heater specs
EOS Mythos is a premium floor-standing electric sauna heater for Finnish dry sauna rooms. Its geometric body, Cubius top stones, stainless construction, and compact 14.6 in depth make it a strong fit for modern cabins, glass walls, boutique wellness spaces, and design-forward home saunas. US Mythos models include S35 at 7.5 or 9.0 kW and S45 at 12.0 or 15.0 kW.
EOS Mythos turns the sauna heater into part of the architecture: US S35/S45 floor-standing dry-sauna models from 7.5-15.0 kW for 280-880 cu ft rooms, 77-99 lb stones, a compact 14.6 in depth, 74.8 in minimum ceiling, and separate EOS control, sensor, guard, ventilation, and electrical-service planning.
Design with EOS Mythos Review the EOS North America Mythos listing
EOS Mythos is a German-made, floor-standing electric sauna heater for indoor Finnish dry sauna rooms where the heater is meant to be visible: modern home saunas, glass-wall rooms, boutique wellness spaces, and commercial-capable cabins.
SaunaDesignPro exposes the US S35 and S45 dry-sauna line: S35 at 7.5 or 9.0 kW with 77 lb of stones, and S45 at 12.0 or 15.0 kW with 99 lb of stones.
S35 can be planned for 208V 3PH or 240V 2PH AC 60 Hz. S45 is planned for 208V 3PH AC 60 Hz only; do not treat S45 as a 240V 2PH US option.
Plan 1.57 in side, back, and front clearance, plus a 74.8 in minimum finished ceiling. The front panel should remain service-accessible and the guard/contact protection must be non-metallic.
Start with room volume, ceiling height, glass or cold surfaces, and available service voltage. Then confirm finish item number, EOS control, temperature sensor/limiter, guard/contact protection, and inlet/outlet ventilation before purchase.
The US Mythos line is suitable for private and commercial indoor Finnish sauna cabins when sized, installed, controlled, and wired according to EOS documentation and local electrical code.
S35 is the narrower 35 kg stone-capacity model for 7.5 and 9.0 kW projects. S45 is the wider 45 kg stone-capacity model for 12.0 and 15.0 kW projects and is listed for 208V 3PH service in the US data.
No. Plan a compatible EOS control unit, required temperature sensor with safety limiter, and final electrical package separately from the heater body.
No. The US Mythos planning page keeps it as an indoor sauna cabin heater only, not exposed outdoor, weather, corrosive-air, or condensation equipment.
Do not show Vapor or Bi-O as a standard US Mythos option unless EOS or the distributor confirms a US-listed SKU and manual. The North American planning scope is S35/S45 Finnish dry sauna.
Yes, its finished appearance works well in visible glass-wall layouts. Final sizing still needs review because glass, masonry, tile, stone, cold shells, poor insulation, and high ceilings can require upsizing near range limits.
Plan the EOS control, sensor/safety limiter, non-metallic heater guard/contact protection, ventilation, compatible wiring, and any Cubius stone or finish-matched guard bracket accessories.
| Variant | Power | Room volume | Dimensions | Rocks | Side/back | Front | Minimum ceiling | Controller |
|---|---|---|---|---|---|---|---|---|
| Mythos S35 7.5Mythos S35 7.5 | 7.5 kW | 280-420 cu ft | 16.5" W x 14.6" D x 33.1" H | 77 lb | 1.57" | 1.57" | 74.8" | EOS EmoTec D/H USA/CAN-compatible control required; control and sensor/limiter are not included |
| Mythos S35 9.0Mythos S35 9.0 | 9 kW | 313-494 cu ft | 16.5" W x 14.6" D x 33.1" H | 77 lb | 1.57" | 1.57" | 74.8" | EOS EmoTec D/H USA/CAN-compatible control required; control and sensor/limiter are not included |
| Mythos S45 12.0Mythos S45 12.0 | 12 kW | 494-634 cu ft | 19.7" W x 14.6" D x 33.1" H | 99 lb | 1.57" | 1.57" | 74.8" | EOS EmoTec D/H USA/CAN-compatible control required; control and sensor/limiter are not included |
| Mythos S45 15.0Mythos S45 15.0 | 15 kW | 634-880 cu ft | 19.7" W x 14.6" D x 33.1" H | 99 lb | 1.57" | 1.57" | 74.8" | EOS EmoTec D/H USA/CAN-compatible control required; control and sensor/limiter are not included |
EOS Mythos North America planning data
source: EOS Mythos North America planning data, technical sheets, manual, and CAD archive (S35/S45 US planning data reviewed 2026-07-09; Mythos OBJ converted through Blender into protected GLB; S35/S45 NA data sheets and Mythos NA installation manual referenced; checked July 9, 2026)
Floor-standing
Floor-standing sizes use their own body height and top clearance.
Mythos S35 7.5 / Mythos S35 9.0 / Mythos S45 12.0 / Mythos S45 15.0
Useful when the store name and manual model number are not identical.
280-880 cu ft
Use adjusted sauna volume after cold surfaces, not just geometric room volume.
151-186 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 2PH AC 60 Hz; EOS EmoTec D/H USA/CAN-compatible control required; control and sensor/limiter are not included / 208V 3PH AC 60 Hz only; EOS EmoTec D/H USA/CAN-compatible control required; control and sensor/limiter are not included
Use the selected kW row and SKU when matching breakers, phases, relays, and controller packages.
US-market Finnish/dry sauna heater only; do not use as exposed outdoor/weather/corrosive/condensation equipment Guard/contact protection is essential in the NA manual; use non-metallic protection and keep the front service panel accessible
10 more notes shown below.
S35 and S45 Finnish dry sauna only
Vapor/Bi-O, dark bronze, and EU 400V variants stay excluded from the US planner unless EOS or the distributor confirms a US-listed package.
S35: 208V 3PH or 240V 2PH; S45: 208V 3PH only
Do not present S45 as 240V-compatible in US planning or customer-facing copy.
7.5 kW 13.8 x 2.0 in; 9.0 kW 13.8 x 2.4 in; 12.0 kW 13.8 x 2.8 in; 15.0 kW 13.8 x 3.5 in
Use non-closable inlet and outlet openings. Inlet may be below or behind the heater; outlet belongs low and diagonal to the heater.
EOS control, temperature sensor/limiter, and non-metallic guard/contact protection required
The heater body includes Cubius stones and instructions, but not the control unit or temperature sensor/safety limiter.