OKA Fusion Synergy 3 - Indoor Hybrid Sauna

The HANSCRAFT OKA Fusion Synergy 3 is a hybrid sauna without compromise — a genuine 6kW Finnish stove and a full nano-carbon infrared system in one cabin, finished in dark thermo walnut behind a wall of smoked glass, under a star-lit ceiling.

Run the stove for traditional löyly heat. Run the infrared for a gentler, deeper session at lower temperatures. Or run both. Designed as one coherent wellness unit rather than two systems bolted together, it is the most complete indoor sauna we sell.

Why hybrid matters

Most households contain two kinds of sauna user. One wants it as hot and steamy as it will go. The other finds that overwhelming and would rather sit at 45–50°C for half an hour. A hybrid ends that argument — the same cabin does both, and you choose per session rather than at the point of purchase.

It also changes how often you actually use it. The stove takes time to bring a cabin up to temperature; the infrared panels are usable within minutes. On a weeknight when you have twenty minutes, that is the difference between using your sauna and not bothering.

The infrared system in detail

This is not a token panel bolted into a traditional cabin. The Fusion Synergy carries a full nano-carbon film system across three walls, at IR-C wavelength, totalling 3,175W:

• Rear wall: 3 × 400 × 900mm panels, 4 × 400 × 300mm panels, plus the 300W lumbar physiotherapy panel
• Left wall: 300 × 900mm, 400 × 900mm and 600 × 300mm panels
• Right wall: 2 × 400 × 900mm panels and 5 × 400 × 300mm panels

Nano-carbon film heats faster than traditional rod emitters, draws less power, and radiates evenly across the whole panel rather than from a hot central line — so you get deep, consistent warmth without the air itself becoming uncomfortably hot.

Dark thermo walnut

The cabin is built from selected thermo walnut — walnut that has been thermally modified at roughly 180–215°C without any chemical treatment. The process stabilises the internal structure of the timber, reduces how much moisture it absorbs, and makes it markedly more resistant to the swings in temperature and humidity a sauna puts it through.

What you get is a dimensionally stable material with a deep, dark brown tone and a refined grain. Against the pale pine and hemlock used in most saunas, thermo walnut reads as furniture rather than equipment — which is the point of putting one inside the house rather than at the bottom of the garden.

The boards are supplied as continuous solid lengths rather than short jointed sections, and the lower and rear structure is finished in Black Sauna Wax for added resistance to moisture and wear.

Black slate rear wall

The rear wall is clad in thin black slate. It is there for more than looks: stone accumulates heat and releases it slowly, so the wall continues to radiate warmth through the session. It also gives the interior its darker, more considered character against the walnut.

Designed by an architect, not a catalogue

The Fusion Synergy belongs to the OKA Design collection, created by HANSCRAFT in collaboration with Czech architect and designer Ing. arch. MgA. Ondřej Kamenický, whose earlier OKA and OKANDINAVIA ranges established the same approach — careful materials, calm proportions, and a design language that ages well rather than dating.

That matters here because hybrid saunas usually look like a compromise: a traditional cabin with infrared panels awkwardly added. This one was drawn as a single unit from the start, which is why the panel cladding, the slate, the lighting and the glass all read as one piece.

Smart control

The stove runs from a touch control panel in the cabin, and from an intelligent WiFi controller via the Smart Life mobile app — so you can bring it up to temperature from the sofa, or on the way home, and walk into a sauna that is already ready.

What's included

• 6kW HANSCRAFT electric sauna stove with touch panel and smart WiFi controller
• Full nano-carbon infrared panel system (3,175W)
• Red Light Physio Zone — 300W lumbar panel with 660nm red light and Softpad
• HANSCRAFT bucket and ladle
• HANSCRAFT hourglass sand timer
• HANSCRAFT thermometer and hygrometer

Specifications

Installation

Electrical. This sauna carries two heating systems: a 6kW stove and a 3,175W infrared array. Both require a dedicated supply installed by a qualified electrician — this is not a plug-in appliance. Please share these figures with your electrician before installation so they can confirm the correct circuit, protection and cable specification for your property, and how you intend to run the two systems.

Siting. The cabin needs a level floor able to take its weight, with clearance around it for assembly and ventilation. Measure your access route before ordering — at 210cm wide and 208cm tall it is a substantial cabin, and doorways, stair turns and ceiling height all need checking first.

Assembly. Supplied for assembly in situ. If you would rather not build it yourself, our team can assemble it on site — quoted separately for your address.

Delivery

Please inspect all packaging on delivery and report any transit damage within 24 hours, with photos and your order number, to support@nuovoluxury.co.uk.

Questions before you buy? Call our team on 0330 133 6617 — we will talk you through sizing, access, assembly and the electrical supply.