EOS ThermoTec sauna heater, manufacturer product photo, manufacturer product image 1

EOS ThermoTec sauna heater, manufacturer product photo, manufacturer product image 2

EOS ThermoTec sauna heater, manufacturer product photo, manufacturer product image 3

EOS ThermoTec sauna heater, manufacturer product photo, manufacturer product image 4

Photo: EOS Saunatechnik

EOS ThermoTec — sauna heater

EOS · EOS Sauna Heaters

Short answer: EOS ThermoTec is a sauna heater made by EOS Saunatechnik in Germany. Sauna Dekor sizes, supplies and installs it in the saunas we build; the product and its certificates are the manufacturer's.

A mid-range heater for a dry Finnish sauna.

Category: Sauna heaters
Series: Classic series
Power options: 6 kW · 7.5 kW · 9 kW
Manufacturer: EOS Saunatechnik · Germany
Capacity: Selected by cabin volume

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EOS Sauna Heaters

Model note

What the EOS ThermoTec is

ThermoTec is a step up from Thermat: it has the same floor-or-wall flexibility, the stone container rises to 18 kg and the container volume is adjustable. The top cover is curved cast aluminium, the inner shell stainless steel and the outer surface a scratch-resistant anthracite pearl effect finish. The floor version measures 78 × 37.5 × 38 cm and the wall version 60 × 37.5 × 38 cm. 6 kW covers 6–8 m³, 7.5 kW covers 7–10 m³ and 9 kW covers 9–14 m³; the air vent grows from 35 × 4 cm to 35 × 6 cm. In the Combi version a 2 kW evaporator and a 5-litre manually filled tank sit on the right-hand side, and the stone container drops to 15 kg. The connection box is at the back.

Close alternatives we also supply and install: the EOS Gracil (6 kW · 7.5 kW · 9 kW), the EOS Euro (6 kW · 7.5 kW · 9 kW · 10 kW · 12 kW), the EOS Herkules S25 (7.5 kW · 9 kW). It belongs to the EOS Sauna Heaters. The EOS overview lists every range.

Technical specifications

EOS ThermoTec specifications

Category	Sauna heaters
Series	Classic series
Power options	6 kW · 7.5 kW · 9 kW
Manufacturer	EOS Saunatechnik · Germany
Capacity	Selected by cabin volume
Electrical connection	400 V 3N ~ 50/60 Hz 400V 3N / 230V 1N universal (ThermoTec)
Fuse protection (control unit)	3 x 16 A
Dimensions H/W/D, in cm	78 / 37.5 / 38 (ThermoTec) 60 / 37.5 / 38 (ThermoTec W) 79 / 45 / 38 (ThermoTec Combi) 60 / 45 / 38 (ThermoTec Combi W)
For sauna cabin size (6,0 / 7,5 / 9,0 kW)	6 – 8 m³ / 7 – 10 m³ / 9 – 14 m³
Min. size air inlet and outlet (6,0 / 7,5 / 9,0 kW)	35 x 4 cm / 35 x 5 cm / 35 x 6 cm
Stone filling	18 kg / 15 kg (Combi)
Power extension required	No
Compatible control units	EOS Econ 4 series · EOS Compact DC/HC series · EOS Compact D18/H18 series · EOS EmoStyle series · EOS EmoStyle Hi series · EOS U-Command · EOS EmoTouch 3

Values: EOS Saunatechnik's published product information (read 15 September 2026). Figures not listed here are sent with the manufacturer's technical sheet.

Selection

How we find the right capacity

We work out the capacity from the cabin volume; the five steps below are done together at the quotation stage.

Start with the cabin volume

Basic rule: cabin volume (m³) × 1 kW. A 2 × 2 × 2.10 m cabin is 8.4 m³ and needs about 9 kW. This figure is a starting point, not the answer.

Add glass and uninsulated surfaces

Add 1.2 m³ to the volume for every m² of glass front, and about 1.2 m³ for every m² of uninsulated concrete or stone. In a cabin with a full glass front, the real requirement is thirty to forty percent above the bare volume.

Agree the power supply early

Above 9 kW a 400 V three-phase supply is required; for lower outputs the phase is chosen according to the heater's installation manual. The heater is fed on its own circuit, with its own fuse and residual current device.

State the usage intensity

A home cabin used two hours a day and a hotel cabin open for ten hours cannot use the same unit. For commercial use, heavy-duty (HD) units and a larger stone mass are chosen.

Choose the control together with the heater

The power a control unit can switch directly is limited; above that, a PEB power boost unit is needed. This is calculated at the quotation stage.

Why EOS

Five series, one ecosystem

The logic you set up in a home works in a hotel too.

Five series, one control family

The same control family runs from the Standard series up to the large commercial series. The logic you set up in a home works in a hotel too.

Modular control

Sauna, hammam, steam and infrared modules plug into the EmoTouch 3 unit. Four rooms are run from one panel, with no separate switchboard.

Open to building automation

With the KNX and Modbus module it connects to the hotel management system, and opening hours can be programmed centrally.

Safety as a separate line

Door contact, emergency button, heater guard and EOSafe are available as separate products. In a commercial facility they are not optional.

Spare parts stock

We keep spare parts in stock in Istanbul for the equipment we install. In a commercial facility, what keeps a cabin closed for months is waiting for parts.

Around 20 years with EOS

We have been installing EOS equipment for around 20 years, so we know from site work how each unit performs in each room volume.

Frequently asked questions

Who manufactures the EOS ThermoTec?

EOS Saunatechnik, in Germany. Sauna Dekor sizes, supplies and installs it; the product warranty and certificates are the manufacturer's.

Does Sauna Dekor install the EOS ThermoTec?

Yes. We size, supply and install the EOS ThermoTec as part of the saunas we design, manufacture and build, in the Gulf and our other markets.

What are the main specifications of the EOS ThermoTec?

Category: Sauna heaters; Series: Classic series; Power options: 6 kW · 7.5 kW · 9 kW; Manufacturer: EOS Saunatechnik · Germany. Values are from the manufacturer's published product information.

Sources