About the product
Premium indoor Finnish sauna for 4 people from the OKA Design range, made from dark Thermo Walnut wood. It is equipped with a 6 kW HANSCRAFT electric heater with an intelligent WiFi controller, ambient lighting, a starry ceiling with a black base, a comfortable backrest, and a complete set of HANSCRAFT sauna accessories.
Dimensions: 210 × 150 × 208 cm.
SAUNA MADE FROM SELECTED THERMO WALNUT WOOD
Selected Thermo Walnut wood is used in the construction of this premium indoor Finnish sauna. This material combines the elegant appearance of walnut with the benefits of controlled thermal modification, making it suitable for demanding wellness environments where visual quality, stability, and long-term durability are essential.
The wood undergoes controlled thermal modification at temperatures of approximately 180–215 °C, without the use of chemical substances. During this process, the internal structure of the wood is stabilized, moisture absorption is reduced, and the material becomes more resistant to changes in temperature and humidity.
The result is a dimensionally stable material with a deep, dark brown tone and a naturally refined wood grain. Compared with lighter sauna woods, Thermo Walnut creates a more elegant and interior-focused impression, making the sauna feel like a premium design element rather than a purely technical wellness product.
The dark walnut appearance gives the interior a calm, sophisticated character, while the thermo-modified surface supports long-term use in a sauna environment. The use of solid boards enhances durability and underlines the clean, functional, and visually refined design of the sauna interior.
OKA Design – collaboration with Czech architect and designer Ing. arch. MgA. Ondřej Kamenický
The OKA Design collection was created in collaboration with Czech architect and designer Ing. arch. MgA. Ondřej Kamenický, with whom HANSCRAFT has long cooperated on the development of premium wellness products. This partnership is behind the popular OKA and OKANDINAVIA ranges, where a strong sense for materials, proportions, and calm, timeless design has proven its value.
Based on these experiences, the collaboration was also extended to the sauna category. For HANSCRAFT, Ondřej Kamenický designed Finnish indoor saunas that continue the consistent design language of the OKA Design range. The result is a sauna that does not feel like a purely technical wellness product, but as a coherent part of a refined wellness space.
Interior and atmosphere
The interior is designed with ergonomics and comfort for up to three people in mind. A double bench made from dark Thermo Walnut wood is complemented by a comfortable backrest, allowing a relaxed seating position even during longer sauna sessions. The thermo-modified wood surface supports long-term use in a sauna environment while maintaining a refined, premium appearance.
A carefully designed ambient lighting system positioned under the benches, near the footrests and on the rear wall creates subtle light accents without visual disturbance. A dominant interior feature is the starry ceiling with a black base, creating a visually calm and focused environment. The space is enclosed by 6 mm tempered dark grey glass with black handles and hinges, combining safety, functionality and modern design.
Technology and construction
The OKA Pure Essential 4 sauna is designed with a strong focus on long-term stability, precise control and reliable operation in demanding sauna conditions. Heating is provided by a 6 kW HANSCRAFT electric heater integrated into a complete heating system with a touch control panel. The system enables fast heat-up and accurate temperature regulation. An intelligent WiFi controller allows convenient remote operation via the Smart Life mobile application and easy adaptation to individual user preferences.
The construction is complemented by a rear wall clad in thin black slate stone, contributing to heat accumulation while also serving as a distinctive aesthetic element. The lower parts of the sauna are treated with Black Sauna Wax, increasing resistance to moisture and mechanical wear while unifying the dark appearance of the interior. The entire solution is designed to maintain technical reliability, dimensional stability and functional performance even during long-term use. An integrated floor is also part of the construction, designed specifically for sauna environments and easy maintenance.