Holl’s Onyxia Cube 4-person outdoor steam sauna

Holl’s Onyxia Cube outdoor steam sauna for wellness spaces

The Holl’s Onyxia Cube is a cube-design outdoor steam sauna, created to add a comfortable, elegant and functional wellness area to gardens, terraces, wellness accommodation, private spas or professional facilities looking for an outdoor sauna with a strong architectural presence.

With a capacity of 4 seated places or 2 people lying down, this model combines a compact 210 x 160 x 220 cm structure with an interior layout designed for enjoyable sauna sessions in a spacious and pleasant setting. Its European manufacturing and use of Finnish ThermoWood® provide a solid outdoor solution with a warm, contemporary aesthetic.

ThermoWood® timber for outdoor use

The Onyxia Cube uses ThermoWood® / Thermowood Premium, wood treated at high temperature through a process with no added chemicals. This treatment improves the dimensional stability of the timber and reduces variations caused by humidity, a particularly relevant feature for an outdoor sauna installation.

The 40 mm Thermowood Premium wood panelling is complemented by black waterproof exterior paint, creating a sober and visually resistant finish suitable for wellness projects where spatial design is as important as functionality.

• Wood ThermoWood® / Thermowood Premium
• Wood origin Finnish
• Main material 40 mm Thermowood Premium wood panelling
• Exterior paint Black waterproof
• Manufacturing European

Comfortable interior with double-height bench

The interior layout includes a double-height bench, allowing users to adapt their position during the session. The sauna can be used by up to 4 seated users or by 2 people lying down, depending on resting preference and occupancy configuration.

The abachi wood headrests add extra comfort for sessions in a lying position. Abachi wood is commonly used in sauna environments thanks to its pleasant feel and suitability for elements in direct contact with the body.

• Capacity 4 seated places or 2 lying down
• Bench Double-height bench
• Headrests Abachi wood
• Floor mat 1 unit included

Glazed design and pleasant lighting

The Onyxia Cube design allows different façade configurations. The front façade can be classic or glazed, while the rear façade can be classic or half-moon glazed, depending on the selected configuration.

The 8 mm tempered glass door helps create a sense of visual openness and a lighter integration into the surroundings. In addition, the integrated LED strip creates pleasant ambient lighting inside the sauna, enhancing the wellness atmosphere without overloading the interior design.

• Door 8 mm tempered glass
• LED strip Integrated
• Front façade Classic / glazed
• Rear façade Classic / half-moon glazed
• Roof Shingle roof

Steam technology and recommended heater

Onyxia Cube is a steam sauna. An electric heater from 4.5 kW is recommended for operation. The heater is not included, allowing the appropriate heating unit to be selected according to the installation, project and technical requirements of each space.

Technical specifications

• Brand Holl’s
• Manufacturer Poolstar
• Model Onyxia Cube
• Reference HL-SSBLK160
• Product type Outdoor steam sauna
• Technology Steam
• Capacity 4 seated places or 2 lying down
• Dimensions 210 x 160 x 220 cm
• Equivalent dimensions 2.1 x 1.6 x 2.2 m
• Wood ThermoWood® / Thermowood Premium
• Wood origin Finnish
• Manufacturing European
• Main material 40 mm Thermowood Premium wood panelling
• Exterior paint Black waterproof
• Door 8 mm tempered glass
• Bench Double-height bench
• Headrests Abachi wood
• LED strip Integrated
• Floor mat 1 unit included
• Recommended heater Electric, from 4.5 kW
• Heater Not included
• Electrical warranty 2 years
• Wood warranty 4 years

For outdoor wellness projects

Thanks to its dimensions, black exterior finish, ThermoWood® timber and façade options, the Holl’s Onyxia Cube fits projects that require an outdoor steam sauna with a defined aesthetic and capacity for shared use. It is suitable for private wellness areas, accommodation spaces with wellbeing services, outdoor spa zones and relaxation environments that require a compact yet comfortable sauna.

Its construction in thermally treated wood to improve stability against humidity, together with its European manufacturing, makes it a solution designed to integrate into outdoor spaces with a refined, professional image.