Charnia 400 Pro 6 Person Outdoor Barrel Sauna with Terrace & Changing Room

The Charnia 400 Pro is designed for people who want a sauna that functions as a complete outdoor space rather than a single room. The extended layout with porch, changing area and dedicated sauna room creates a natural flow between heat and fresh air while keeping warmth inside during use.

The barrel form supports even heat circulation while the 42 mm Nordic spruce structure remains stable through changing weather and repeated heating cycles. This helps the sauna reach temperature efficiently and maintain consistent heat, with simple maintenance required to protect the exterior.

In daily use the separation between rooms keeps the sauna clean and comfortable. Two level benching allows varied heat exposure, and the porch provides a sheltered place to cool down between sessions. It works for regular home use as well as social settings or guest accommodation.

Installation is straightforward on a level base using the supplied cradles and fixings, and the flat pack format makes access manageable for most garden locations, whether self built or professionally installed.

Over time it becomes part of a routine rather than a feature, supporting year round recovery, relaxation and shared outdoor use.

Model
Charnia 400 Pro outdoor 6 person barrel sauna

Capacity
Suitable for up to 6 users

External Dimensions
4000 mm depth, 2050 mm width, 2150 mm height

Internal Dimensions
3916 mm depth, 1966 mm width, 2066 mm height

Internal Volume / Floor Area
7.70 m²

Layout
Front cooling porch, separate changing room and dedicated sauna room

Wall Construction
Nordic spruce interlocking wall system, 42 mm side walls with 28 mm front and rear sections

Bench Configuration
Two tier alder or thermo aspen bench configuration with backrests

Door
Entrance door 1650 mm height x 590 mm width with internal glass sauna door

Glazing
Multiple windows

Roof Construction
Curved barrel roof with bitumen shingle roof covering

Ventilation
Integrated ventilation system for controlled airflow

Lighting
Additional lighting options available

Heater Compatibility
Suitable for electric or wood fired sauna heaters

Base Requirements
Requires a level load bearing surface such as concrete, paving or ground screw system

Delivery Format
Flat pack for on site assembly

Weight
Approximately 1500 kg

Use Environment
Outdoor garden installation

Enjoy these health benefits at home

Multi Zone Contrast Therapy
Changing room and porch allow staged temperature transitions that improve circulation and recovery.

Extended Heat Stability
Large thermal mass maintains consistent temperature for longer sessions.

Social Wellness Environment
Six person layout supports group relaxation and mental wellbeing.

Controlled Cooling Phase
Sheltered porch reduces thermal shock compared to direct outdoor exposure.

Outdoor Recovery Integration
Ideal for pairing with plunge or lake access for full hydrothermal routines.

Self-installation and professional installation available

Electrical Requirements

A suitable electrical supply must be planned in advance according to the selected heater output and control system. Cable routing should be prepared before final assembly to avoid retrofitting through finished panels.

Qualified Electrical Connection

All electrical wiring, heater connection and commissioning must be completed by a qualified electrician in accordance with current regulations. This ensures safe load handling, correct operation and full warranty compliance.

Base Preparation

Installation is designed for a competent self build on a level, load bearing surface such as concrete, paving or a suitably reinforced decking subframe. The base must be flat and stable to support the unit weight and ensure correct door alignment and structural performance.

Access and Delivery

Delivered flat packed on a kerbside pallet, typically a minimum of 500 kg. Where access allows, a pump truck can be used to move the pallet across solid, level surfaces and position it closer to the installation area. Individual components are sized for manual handling, allowing them to pass through standard garden access points without cranes or lifting equipment.

Assembly Process

All primary structural elements are pre cut and supplied with stainless steel fixings, tension bands and clear step by step instructions. The cabin is assembled in position on the designated support points, with allowances for ventilation gaps and heater safety clearances.

Heater Position and Ventilation

Adequate space must be maintained around the heater location in line with manufacturer guidelines. Integrated ventilation points must remain unobstructed to ensure correct airflow, safe operation and consistent heat performance.

Delivery and collection options

Standard Delivery

Delivery to mainland UK is completely free, in stock items dispatch within 5 days. Contact us to arrange delivery dates that work for you. Additional charges apply to locations outside of UK mainland.

Please inspect your delivery within 24 hours of arrival for any damage that may have occurred during transit, so we can arrange a replacement as quickly as possible.

Your sauna is delivered kerbside to the nearest accessible point at your property, such as a driveway or pavement. Each delivery arrives clearly organised, well-protected and with full installation instructions included for a smooth and straightforward self-install.

Local Collection

You are welcome to collect your order from our warehouse in Leicester. Please note that the components are long and heavy, so a large van or flatbed truck will be required.

If you would like to arrange collection, kindly contact us to schedule a suitable date and time.

Returns and Refunds

You can return an order within 14 days of receiving it.

Please allow up to 14 days from sending the item to receive your refund.

How to Return Your Order

We'll collect the order from you. Collections are free if your order is damaged or faulty. If not, we charge a collection fee. To arrange a collection, please contact us.

Return your order for free by dropping it off at our Leicester warehouse, please contact us first.

Caring for your sauna

Exterior Protection and Maintenance

Protect the exterior of your sauna with a fully breathable wood paint during or immediately after assembly. We recommend a water based product such as Sadolin Superdec. Apply two to three coats for full coverage, then refresh every few years. This helps protect the timber from weathering, keeps the finish looking clean and supports long term durability in outdoor conditions.

Interior Maintenance

The internal walls, benches and backrests are factory treated for protection. Clean regularly with a soft damp cloth and allow the interior to dry fully after use by leaving the door open. We recommend applying a light coat of mineral oil periodically to benches and backrests to maintain the timber, reduce moisture absorption and keep the surface comfortable and hygienic.

Ventilation and Drying

After each session, allow fresh air to circulate by opening the door and any adjustable vents. Proper drying helps prevent moisture build up, supports timber stability and keeps the sauna environment fresh for the next use.

Heater Care and Safe Operation

Inspect the heater regularly to ensure stones are correctly stacked and air can circulate freely. Do not overfill the stone basket and only use approved sauna stones. Remove any broken or crumbling stones during routine checks. Keep heater safety clearances free from towels or combustible materials and never operate the heater without stones in place.

Electrical and Control Checks

Ensure all electrical connections are installed by a qualified professional and remain dry and protected. Periodically check the control unit for correct operation and avoid exposing it to excess moisture or direct water contact.

General Use Guidance

Use only clean water on sauna stones when producing steam and avoid additives unless approved by the heater manufacturer. Do not dry clothing inside the sauna as this restricts airflow and increases fire risk.

Seasonal Care

If the sauna will not be used for extended periods, ensure the interior is fully dry, clean all surfaces and disconnect power to the heater where appropriate.

Our warranty explained

Warranty

All sauna cabins and outdoor wellness structures include a 2 year residential warranty covering manufacturing defects in structural timber and factory supplied hardware. This applies only where the exterior timber has been treated and maintained as recommended. For rental, hospitality, spa or any revenue generating use, a 1 year commercial warranty applies.

The warranty covers defects in materials and workmanship under normal operating conditions.

Heaters, electrical components and third party accessories are covered by their respective manufacturers.

Proof of purchase, confirmation of installation on a suitable level base and evidence of timber treatment may be required to support a claim.

What Is Covered

Manufacturing or construction defects in structural timber and factory supplied components.

Replacement of missing, damaged or faulty parts identified at delivery or during correct installation.

Technical support from our team to assess issues and coordinate replacement parts or specialist assistance where required.

What Is Not Covered

Natural timber movement, colour variation, surface cracking, resin release and normal weathering.

Issues caused by incorrect installation, inadequate base preparation or poor ventilation.

Misuse, failure to follow heater safety clearances or non compliant electrical installation.

Exposure to standing water, ground contact outside designated support points or unauthorised structural modification.

Installation and Use Requirements

The sauna must be installed on a level, load bearing base with adequate ventilation.

The exterior timber must be treated after installation and re treated periodically.

All electrical wiring and heater commissioning must be completed by a qualified electrician and in line with safety clearances.

The sauna is intended for normal residential use unless a commercial agreement is in place.

Maintaining Your Cover

Failure to meet installation, electrical or clearance requirements may invalidate the warranty.

Proof of purchase and installation details must be retained for any future claim.