EOS Herkules XL S120 HDRequest a quote

EOS Herkules XL S120 HD sauna heater, manufacturer product photo, manufacturer product image 1

EOS Herkules XL S120 HD sauna heater, manufacturer product photo, manufacturer product image 2

EOS Herkules XL S120 HD sauna heater, manufacturer product photo, manufacturer product image 3

EOS Herkules XL S120 HD sauna heater, manufacturer product photo, manufacturer product image 4

Photo: EOS Saunatechnik

EOS Herkules XL S120 HD — sauna heater

EOS · EOS Sauna Heaters

Short answer: EOS Herkules XL S120 HD 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.

The largest tower in the catalogue; for hotel and thermal facility cabins.

Category: Sauna heaters
Series: Commercial — large scale
Power options: 18 kW · 24 kW · 30 kW
Manufacturer: EOS Saunatechnik · Germany
Capacity: Selected by cabin volume

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EOS Sauna Heaters

Model note

What the EOS Herkules XL S120 HD is

The Herkules XL S120 HD is the largest body in the family: two separate stone containers, 60 kg each, 120 kg in total. Because the containers sit above the elements, output does not drop under heavy use, and elements can be replaced without emptying the stones. Internal wiring runs on solid copper busbar. It measures 85 × 96 × 53 cm, with a depth of 53 cm and a weight of 85 kg without stones. 18 kW covers 24–35 m³, 24 kW covers 35–45 m³ and 30 kW covers 45–65 m³; these require PEB 10, PEB 18 and PEB 36 respectively. In the Combi version a 3–4 kW evaporator sits between the two containers and works with an automatic water refill unit. The retrofit Herkules Fragrance essence tray mounts at the centre of the left and right side walls.

Close alternatives we also supply and install: the EOS Goliath HD (18 kW · 24 kW · 30 kW · 36 kW), the EOS Orbit (18 kW · 21 kW · 24 kW), the EOS Zeus HD (20 kW · 24 kW · 30 kW · 36 kW). It belongs to the EOS Sauna Heaters. The EOS overview lists every range.

Technical specifications

EOS Herkules XL S120 HD specifications

Category	Sauna heaters
Series	Commercial — large scale
Power options	18 kW · 24 kW · 30 kW
Manufacturer	EOS Saunatechnik · Germany
Capacity	Selected by cabin volume
Electrical connection	400 V 3N ~ 50/60 Hz
Fuse protection control unit (18 / 24 / 30 kW)	3 x 16 A / 3 x 16 A / 1 x 16 A
Fuse protection PEB unit (18 / 24 / 30 kW)	3 x 16 A / 3 x 35 A / 3 x 63 A
Dimensions H/W/D, in cm	85 / 96 / 53
For sauna cabin size (18 / 24 / 30 kW)	24 – 35 m³ / 35 – 45 m³ / 45 – 65 m³
Min. size air inlet and outlet (18 / 24 / 30 kW)	50 x 6 cm / 50 x 8 cm / 50 x 10 cm
Weight without stones	85 kg
Stone filling	120 kg
Power extension required	PEB 10 / PEB 18 (H) / PEB 36 (H)
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 · PEB 10 · PEB 18 / 18 H · PEB 36 / 36 H

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 Herkules XL S120 HD?

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 Herkules XL S120 HD?

Yes. We size, supply and install the EOS Herkules XL S120 HD 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 Herkules XL S120 HD?

Category: Sauna heaters; Series: Commercial — large scale; Power options: 18 kW · 24 kW · 30 kW; Manufacturer: EOS Saunatechnik · Germany. Values are from the manufacturer's published product information.

Sources