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

Photo: EOS Saunatechnik

EOS Filius — sauna heater

EOS · EOS Sauna Heaters

Short answer: EOS Filius 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 compact body for residential cabins.

Category: Sauna heaters
Series: Classic series
Power options: 4.5 kW · 6 kW · 7.5 kW
Manufacturer: EOS Saunatechnik · Germany
Capacity: Selected by cabin volume

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EOS Sauna Heaters

Model note

What the EOS Filius is

At only 24 cm deep, the Filius hangs directly on the cabin wall; carrying an 8 kg stone chamber within that depth is the real achievement of the range. The top cover is stainless steel and the outer shell is anthracite pearl effect. The dry version measures 57 × 40 × 24 cm, the Combi version 57 × 47 × 24 cm. 4.5 kW covers 4–6 m³, 6 kW covers 6–8 m³ and 7.5 kW covers 7–10 m³; supply is 400 V three phase, 3 × 16 A. In the Combi version the 0.75 kW evaporator can be set to the right or the left, the 2-litre tank is filled by hand, and an alarm sounds when the water runs out. Air inlet and outlet vents are 35 × 11 cm. Weight without stones is 11 kg, or 18 kg in the Combi version.

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

Technical specifications

EOS Filius specifications

Category	Sauna heaters
Series	Classic series
Power options	4.5 kW · 6 kW · 7.5 kW
Manufacturer	EOS Saunatechnik · Germany
Capacity	Selected by cabin volume
Electrical connection	400 V 3N ~ 50/60 Hz (Filius W) 400 V 3N / 230 V 1N ~ 50/60 Hz (Filius Combi W)
Fuse protection (control unit)	3 x 16 A
Dimensions H/W/D, in cm	57 / 40 / 24 (Filius W) 57 / 47 / 24 (Filius Combi W)
For sauna cabin size (4,5 / 6,0 / 7,5 kW)	4 – 6 m³ / 6 – 8 m³ / 7 – 10 m³
Min. size air inlet and outlet	35 x 11 cm
Gewicht ohne Steine und Verpackung	11 kg (Filius W) 18 kg (Filius Combi W)
Weight without stones	8 kg
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 Filius?

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 Filius?

Yes. We size, supply and install the EOS Filius 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 Filius?

Category: Sauna heaters; Series: Classic series; Power options: 4.5 kW · 6 kW · 7.5 kW; Manufacturer: EOS Saunatechnik · Germany. Values are from the manufacturer's published product information.

Sources