Steam & Oak Cube Sauna 3.4m Premium L-Bench (Electric, Gas or Wood-Fired)

Steam & Oak 3.4m Premium Cube Sauna with L-Shaped Benches – Choose Your Heater

Create a dedicated space to slow down, warm up and reconnect with the outdoors. The Steam & Oak 3.4m Premium Cube Sauna combines natural Scandinavian spruce, generous two-level alder benches and a contemporary cube design to bring the Finnish sauna ritual into your garden.

Designed for four to six people, this spacious outdoor sauna offers more than room to sit and unwind. The L-shaped corner benches create a natural space for conversation, while the two-level layout gives everyone a choice of seating height. A separate enclosed anteroom provides space to change, prepare for your session or cool down between rounds of heat.

With 44mm timber walls, 8mm tempered glass and a choice of gas, electric or wood-fired heating, this premium garden sauna is designed around the way you want to enjoy your time outdoors.

Choose the FinSteam Aurora 81 R14S gas heater, a Harvia electric heater, the Etna 12 wood-fired stove or the shell-only option if you prefer to source your own compatible heater.

New: Gas-Heated Cube Sauna

The Steam & Oak 3.4m Premium Cube Sauna is available with the FinSteam Aurora 81 R14S gas heater, offering an alternative to conventional electric and wood-fired heating. Select + FinSteam Aurora 81 R14S Gas Heater at checkout to receive the cabin with purpose-designed gas ventilation and the complete heater package.

The gas configuration is designed for people who want sauna heat without relying on a mains electrical supply. The heater connects to an external UK propane bottle, with a warm-up time of approximately 15–20 minutes. No dedicated electrical circuit or chimney is required for the gas heater configuration.

The Aurora 81 is described as the only CE-marked electricity-free sauna gas heater on the European market.

Gas, Wood or Electric: What's the Difference?

Gas vs Electric: Understanding the Total Cost

The initial price of an electric sauna is only part of the cost of getting started. A 6.8–9 kW electric heater requires an appropriate dedicated circuit, installed by a qualified electrician and signed off under Part P where applicable. Electrical installation may cost approximately £800–£1,500, depending on your property and the work required.

The FinSteam gas configuration connects to an external UK propane bottle and does not require a dedicated mains electrical circuit for the heater. This can make it an appealing option for gardens where electrical installation would be expensive or inconvenient.

Once electrical installation is included, the difference between the two configurations narrows. Based on these estimates, the gas option costs approximately £495–£1,195 more overall, rather than the full difference in the initial cabin prices.

A standard UK 13 kg Calor propane bottle is estimated to provide more than a dozen sessions, depending on usage. A Gas Safe registered engineer is required for a fixed gas installation. All heating configurations must be installed and used in accordance with their applicable safety requirements.

Purpose-Designed Ventilation for the Gas Configuration

The gas version includes wooden louvre vents built into the cabin at the specified sizes for the FinSteam heater. The arrangement provides fresh air to the heater and allows exhaust air to discharge directly outdoors.

• Low-level air intake: At least 350 cm², positioned low beside the heater to draw fresh air directly from outside.
• High-level exhaust: At least 250 cm², positioned in the opposite corner and discharged directly outdoors.
• Wooden louvre vents: The gas configuration does not use plastic disc or twist valves.
• Matched configuration: The ventilation arrangement and FinSteam heater are specified together under EU Gas Appliance Regulation 2016/426.

The electric and wood-fired configurations use the appropriate ventilation arrangement for their selected heating system.

What's Included with the Gas Heater Package?

• Premium cube sauna shell: A spacious cabin with an integrated porch and enclosed anteroom.
• L-shaped, two-level alder benches: Corner seating designed for shared sessions, with a choice of upper and lower seating positions.
• 8mm tempered glass: Glass door and window construction.
• Gas-ready ventilation: Built-in wooden louvre vents in the specified sizes.
• FinSteam Aurora 81 R14S gas heater: 8.1 kW heater, AENOR-tested under Regulation 2016/426.
• Safety features: Oxygen-depletion sensor (ODS) with automatic shut-off and flame monitoring.
• Orbis 14 stone cage, Halo safety rail and Njord heat shield: Included as standard.
• UK propane regulator and gas hose: 1.2m CE-marked gas hose.
• 40kg of FinSteam sauna stones: Pre-washed and sized for the heater's stone cage.

The FinSteam Aurora 81 R14S has a standalone retail price of £2,395. With the gas configuration, the heater and cabin are bundled together at £9,290 including VAT.

Discover the FinSteam Aurora 81 gas heater.

What You'll Need to Source Locally

• Propane bottle: A standard UK 13kg Calor propane bottle, available from local BBQ, camping and petrol-station retailers.
• Gas installation: A Gas Safe registered engineer is required for a fixed gas connection under UK requirements.

Choose Your Heater

Every garden and sauna routine is different. Choose the heating system that best suits your space, installation requirements and preferred way to enjoy the sauna.

• FinSteam Aurora 81 R14S Gas Heater: The gas-heated option, with an 8.1 kW heater, engineered gas-ready ventilation and the bundled accessories described above.
• Shell only: Purchase the cabin without a heater if you intend to source your own compatible heating system.
• Harvia PC70 Electric Heater, 6.8 kW: An electric option sized for the interior, requiring an appropriate single-phase supply of approximately 25A.
• Harvia PC90 Electric Heater, 9 kW: A higher-powered electric option for faster warm-up and heat recovery.
• Etna 12 Wood-Fired Stove and Flue Kit: A traditional log-fired option for those who enjoy the ritual of building and tending a fire. The installation requires appropriate flue clearances from buildings and overhanging trees.

Room to Relax, Connect and Unwind

The defining feature of this premium cube sauna is its combination of generous interior space and thoughtful seating. The L-shaped, two-level alder benches create a more sociable layout than a simple straight bench, allowing people to sit around the corner and face one another during a shared session.

The two bench levels also offer a choice of seating height. The upper bench provides a hotter position, while the lower bench is closer to the floor, where temperatures are generally cooler. This flexibility can help people with different heat preferences find a comfortable place to sit.

The enclosed 0.75m anteroom adds another practical layer to the experience. Use it as a place to change before entering the sauna, store clothing or pause between sessions. Alongside the 0.4m porch, it gives the cabin a more complete outdoor-sauna layout, with space to prepare, warm up and cool down.

With an external length of approximately 3.4m, including the porch and anteroom, this is a substantial garden feature designed for regular use and shared sauna sessions.

Natural Materials and Thoughtful Construction

Clean lines, natural timber and durable finishes give this sauna its understated, contemporary character.

• Walls: 44mm Scandinavian spruce, kiln-dried to 14% moisture content.
• Benches: Two-level, L-shaped alder benches with a corner configuration for conversational seating.
• Door and windows: 8mm tempered glass.
• Roof: Bitumen shingles.
• Porch and anteroom: An integrated 0.4m porch and 0.75m enclosed anteroom.
• Heater: Choose the FinSteam Aurora 81 R14S gas heater, Harvia 6.8 kW or 9 kW electric heater, Etna 12 wood-fired stove, or shell-only option at checkout.

What's Included with the Sauna?

The standard cabin package includes:

• Sauna shell.
• Base beams.
• Pre-cut and numbered wooden panels.
• Stainless steel tension bands.
• Alder benches with backrests.
• 8mm tempered glass door.
• Ventilation valve and grill, with the vent type matched to the selected heater.
• Stainless steel floor drainage grid.
• Bitumen roof shingles.
• Fastener kit and assembly manual.

The selected heater and stones are included with the gas, Harvia electric and Etna wood-fired configurations. The shell-only option is supplied without a heater for customers using their own compatible system.

Warranty: 24 months.

Warm-Up Times and Running Costs

Running costs depend on your chosen heater, energy prices, outside temperature, session length and preferred temperature. The following figures are estimates and will vary with individual use.

FinSteam Gas Heater

• Warm-up time: Approximately 15–20 minutes.
• Estimated running cost: £1.50–£2.00 per session.

Harvia 6.8 kW Electric Heater

• Warm-up time: Approximately 30 minutes.
• Estimated running cost: £1.75–£2.25 per 90-minute session.

Harvia 9 kW Electric Heater

• Estimated running cost: £2.00–£2.50 per session.
• Performance: Higher power for faster warm-up and heat recovery between löyly sessions.

Etna 12 Wood-Fired Stove

• Estimated running cost: £2–£4 per session using hardwood logs.
• Experience: Traditional wood-fired heating, with the ritual of lighting and tending a fire.

Read our UK sauna running-cost guide for a closer look at the ongoing cost of enjoying a sauna at home.

Delivery and Site Preparation

A little preparation before delivery helps make installation smoother. This is a substantial outdoor structure, so ensure your base, access route and chosen heating installation are planned before your sauna arrives.

• Delivery: Free standard UK delivery.
• Estimated transit time: 2–10 working days.
• Packaging: One oversized pallet measuring 3.4 × 1.2 × 1.0m.
• Site preparation: A stable, level base is required before delivery.
• Electrical configurations: Harvia variants require a dedicated 32A single-phase or 16A three-phase supply, installed by a qualified electrician.
• Gas configuration: Requires a locally sourced UK 13kg Calor propane bottle. A Gas Safe registered engineer is required for a fixed gas connection.
• Wood-fired configuration: The Etna 12 stove requires a suitable flue installation and appropriate clearances from buildings and overhanging trees.
• Assembly: Self-assembly, typically requiring two people and approximately 10–16 hours of work spread over one to two days.

Technical Specifications

Need Help Choosing Your Sauna?

Choosing a sauna involves more than appearance. Your available space, preferred heat source, installation requirements and running costs all play a part.

Explore our complete UK sauna buying guide for a closer look at gas, electric and wood-fired heating, indoor and outdoor saunas, running costs and installation requirements. The guide was written by founder Sarb Gill.

Prefer a traditional curved profile? Explore the 3m Barrel Sauna with Anteroom or the 3m Barrel Sauna with Canopy. Looking for a smaller cube without the enclosed anteroom? Discover the 2.4m Double-Shelf Cube Sauna.