4 Person Combination Bio Indoor Sauna by Centuraheat - 6100W

SKU: HEAT-HS3004
£3,370.00 GBP £3,744.00
Tax included Shipping calculated at checkout.

🚚 Estimated Delivery: Wednesday, March 11 - Thursday, March 12


Questions before ordering?
Speak to our UK-based sauna support team on 0333 038 2800.
We’re happy to help with sizing, delivery, or installation questions.

In stock — this item is typically delivered in 1-2 days.

Bring the complete spa experience home with the CenturaHeat 4 Person Combination Bio Indoor Sauna, available from Gym Fitness Store. Handcrafted from premium Canadian Hemlock, this spacious four-person sauna delivers both traditional steam and infrared therapy — giving you the flexibility to choose your preferred heat style or enjoy the benefits of both at once.

Steam and Infrared in One Cabin

This hybrid design combines a powerful 4500 W sauna stove for authentic steam sessions with 1600 W infrared carbon fibre panels for deep, muscle-penetrating warmth. Whether you prefer the gentle radiance of infrared or the enveloping humidity of a traditional sauna, this model provides a professional-grade experience tailored entirely to you.

Built for Shared Wellness

Perfect for couples or families, the spacious four-person layout offers room to relax without feeling crowded. The natural Canadian Hemlock interior enhances insulation while creating a calm, spa-like environment with a smooth finish and subtle wood aroma.

Smart Control and Immersive Comfort

Temperature, session length, and lighting can all be adjusted using the intuitive digital control panel or the included smartphone app. Bluetooth connectivity, FM radio, and USB MP3 playback let you enjoy music or guided sessions through built-in speakers, while ambient LED lighting and optional star ceiling lights help create a deeply relaxing atmosphere. A built-in oxygen ioniser keeps air fresh and comfortable throughout every session.

Hardwired installation required: This sauna must be connected to your property’s mains supply by a qualified electrician.

KEY FEATURES

Dual heating system: 4500 W stove plus 1600 W infrared carbon fibre panels

Flexible capacity: Spacious 4 person indoor layout

Premium materials: Crafted from high-quality Canadian Hemlock

Smart controls: Digital panel with mobile app connectivity

Wide temperature range: Adjustable from 18°C to 99°C

Custom session timer: Programmable from 1 to 99 minutes

Integrated audio: Bluetooth, FM radio, and USB MP3 playback

Ambient lighting: LED reading light, coloured light belt, optional star ceiling

Air purification: Built-in oxygen ioniser for fresher air

Home installation: Hardwired 230 V electrical connection

SPECIFICATION

Capacity: 4 person
Sauna Type: Indoor combination steam and infrared sauna
Heater Type: Infrared carbon fibre panels and traditional sauna stove
Temperature Range: 18°C–99°C
Timer: 1–99 minutes

Dimensions (W × D × H): 1800 mm × 1800 mm × 2000 mm
Material: Canadian Hemlock wood

Control Options: Digital control panel and mobile app
Audio: Bluetooth, USB MP3, FM radio
Lighting: LED reading light, coloured light belt, optional star ceiling
Air Quality: Built-in oxygen ioniser

Rated Power: 6100 W (4500 W stove + 1600 W infrared)
Voltage: 230 V
Current: 25 A (stove) + 13 A (infrared)
Connection: Hardwired installation required

Assembly: Flat-packed
Included Accessories: Bucket, ladle, sand timer, thermo-hygrometer, towel rack, sauna stones, oxygen ioniser
Warranty: 1 year (electrical components), 2 years (wooden structure)

DELIVERY

Your sauna is delivered securely packaged to help ensure safe transport and straightforward handling on arrival.

Most saunas are delivered in multiple flat-packed boxes or a wooden crate, depending on the model. Delivery is kerbside only, meaning the driver will deliver to the nearest accessible point at your property but is not responsible for moving the goods inside.

This product is delivered on a 7.5 or 18 tonne vehicle. If access for a vehicle of this size may be restricted, please contact us in advance. Additional charges may apply if re-delivery is required using a smaller vehicle.

If you are unsure whether your postcode qualifies for free delivery, please use the delivery fee calculator in the shopping cart.

Sauna Type Weight No. of Boxes Dimensions
Infrared Light Sauna 300kg + 3-5 Flat packed
Traditional Steam Saunas 270kg + 4-7 Flat packed
Outdoor Saunas 300kg + 3-6 Flat packed
Wood Barrel Saunas 616kg + 1 Wood Crate
Corner Saunas 350kg + 3-7 Flat packed
Deluxe Relax Saunas 300kg + 3-7 Flat packed
Combination Saunas 300kg + 4-7 Flat packed

INSTRUCTIONS

This sauna is supplied flat-packed and is designed for home self-assembly. Full written instructions and a step-by-step video guide are included to help make installation straightforward.

Position the sauna on a level, solid indoor surface with adequate surrounding clearance for ventilation and access. Ensure the room is dry and well ventilated.

This model must be hardwired by a qualified electrician to a suitable 230 V supply. Ensure all electrical work complies with current regulations.

Please note: any device above 3000W requires an electrician to connect it to the mains.

Before first use, wipe down interior surfaces and run the sauna briefly to allow the heaters to settle. Always follow the safety guidance provided in the manual regarding session length, hydration, and safe operation.

Frequently Asked Questions

Infrared Sauna FAQ

What is an infrared sauna and how does it work?

Infrared saunas use panels that warm your body directly instead of heating the air like a traditional steam sauna. The result is a deep, comfortable heat that feels gentle and is easy to stay in for longer sessions. Most people describe it as a smoother, more relaxing type of warmth.

How hot does an infrared sauna get?

Air temperatures are usually lower than a steam sauna, but the heat feels just as effective because it penetrates the body rather than surrounding you with high heat. Typical ranges vary by model, and most users preheat the cabin for around 10–20 minutes.

What are the benefits of using an infrared sauna?

Many people use infrared saunas to ease everyday muscle tension, support circulation, wind down after workouts, and improve general wellbeing. The gentle heat makes them easy to use regularly and suits people who prefer a less intense experience than a traditional sauna.

Do infrared saunas plug into a normal household socket?

Most smaller infrared saunas are designed for standard UK plugs, though larger multi-person or full-spectrum units may require a dedicated electrical circuit. Always check the power rating on the specific product page and follow the guidance of a qualified electrician if unsure.

How long should an infrared sauna session last?

New users often start with 10–15 minutes and gradually increase to 20–30 minutes. Many people use an infrared sauna three to five times a week. Listen to your body, stay hydrated, and step out if you feel light-headed or uncomfortable.

Are infrared saunas safe to use?

They’re widely used at home and in spas and are generally safe for most healthy adults. As with any heat therapy, hydration is important. If you’re pregnant, have a heart condition, or take specific medications, check with a healthcare professional before use.

What’s the difference between far infrared and full-spectrum infrared?

Far infrared provides deeper, gentler warmth, while full-spectrum models combine different wavelengths for a broader heat profile. Some users prefer the softer feel of far infrared; others like the more immediate warmth full-spectrum panels provide. Product pages list which heater type each model uses.

Do infrared saunas require much maintenance?

Very little. Wipe down surfaces after use, keep the glass clean, and let the cabin air out by leaving the door open for a few minutes. There are no stones to replace and no plumbing involved.

Can I assemble an infrared sauna myself?

Most infrared saunas arrive flat-packed and slot together using pre-fitted connectors. Two adults can usually assemble one in under 60–90 minutes. If the model requires a dedicated electrical connection, a qualified electrician should complete that part.

Is EMF something I should be concerned about?

Many infrared saunas are engineered with low-EMF technology. When low EMF is a feature of a particular model, it will be listed clearly on the product page so you can choose based on your preferences.

Steam Sauna FAQ

What is a steam sauna and how does it work?

A steam sauna uses an electric heater filled with stones. When water is poured over the heated stones, it creates steam and raises humidity, producing the classic Finnish-style sauna environment with hot, humid air and an intense, invigorating heat.

How hot does a steam sauna get?

Steam saunas operate at higher air temperatures than infrared models. The exact heat depends on heater size, cabin volume, and insulation. Some users prefer short, high-intensity sessions, while others enjoy gentler heat with added steam.

Do steam saunas require plumbing?

No. Steam is created manually by pouring water onto the stones. There is no built-in water connection or drainage inside the cabin. The surrounding room simply needs normal airflow so moisture can dissipate when the door is opened.

What electrical supply does a steam sauna need?

Steam sauna heaters vary in power depending on the model. Many home heaters fall between 3 kW and 9 kW.
Important: Any heater above 3 kW must be hard-wired on a dedicated circuit by a qualified electrician. Always check the rated wattage before installation.

How long does a steam sauna take to heat up?

Typical heat-up time is around 30–45 minutes, depending on heater output, cabin size, insulation, and room temperature. Proper preheating allows the stones to reach the right temperature for consistent steam.

Do steam saunas create a lot of moisture?

Inside the cabin, yes — that’s intentional. Outside the cabin, moisture is minimal and usually released only when the door is opened. Normal room ventilation, such as a window or extractor fan, is sufficient to manage this.

Where can I install a steam sauna?

Steam saunas can be installed in indoor spaces such as home gyms, utility rooms, large bathrooms, or dedicated wellness rooms. Outdoor-rated models can be installed in gardens, on patios, or under shelter. Always check whether the sauna is listed as indoor or outdoor before installation.

Are steam saunas safe to use?

Steam saunas are widely used in both home and commercial settings. Stay hydrated, avoid alcohol before use, and leave the sauna if you feel unwell. Anyone with medical conditions, including heart issues or pregnancy, should consult a healthcare professional before use.

How often should I use a steam sauna?

Many people use a steam sauna three to five times per week. Beginners often start with shorter sessions of around 8–12 minutes and gradually increase duration as they become more comfortable with the heat.

Do steam saunas require much maintenance?

Maintenance is simple. Wipe down benches after use, leave the door open to help the cabin dry, and occasionally clean or reposition the stones according to the manufacturer’s guidance. Exterior wood treatment may be required depending on placement.

What’s the difference between a steam sauna and an infrared sauna?

A steam sauna heats the air and increases humidity for a traditional, high-heat experience. An infrared sauna heats the body directly at lower air temperatures. The choice comes down to whether you prefer intense heat or a gentler, deeper warmth.

Hybrid Sauna FAQ

What is a hybrid sauna and how does it work?

A hybrid sauna combines two heating systems in one cabin: infrared panels that warm the body directly and a traditional heater that raises air temperature and can produce steam when water is poured over the stones. Each system can be used independently or together, giving you a flexible range of heat experiences.

Can I run the infrared heaters and the steam heater at the same time?

Most hybrid saunas allow both systems to operate together, but they can also be used separately. Many users choose infrared heat for gentler sessions and switch to the traditional heater when they want higher temperatures or steam. Always follow the control instructions for safe operation.

Do hybrid saunas heat up faster than standard steam saunas?

Yes. Infrared panels begin warming the body almost immediately, while the traditional heater gradually increases the air temperature. This means you can start enjoying heat before the cabin reaches full steam-sauna temperature.

What electrical supply does a hybrid sauna need?

Hybrid saunas typically require two electrical supplies: one for the infrared system, which is often plug-and-play depending on size, and one dedicated circuit for the traditional heater. Any heater above 3 kW must be hard-wired by a qualified electrician. Always check the model specifications before installation.

Is the running cost higher because it uses two heating systems?

Not necessarily. Infrared heating is energy-efficient and is often used on its own for shorter sessions. The traditional heater draws more power but is only active when selected. Most owners switch between systems based on the type of session they want.

Do hybrid saunas feel hotter than infrared-only models?

They can. Infrared heat provides deep, gentle warmth without very high air temperatures. When the traditional heater is used, overall cabin temperature increases, creating the classic hot-room feel associated with Finnish saunas.

Are hybrid saunas suitable for beginners?

Yes. Beginners often start with infrared-only sessions because they feel milder and easier to tolerate. As comfort increases, users can introduce the traditional heater or combine both systems. Hybrid saunas work well for households with mixed preferences.

Does the hybrid design affect maintenance?

Maintenance is similar to owning both an infrared and a steam sauna. Wipe down interior surfaces after use, allow the cabin to dry with the door open, and occasionally check heater stones, controls, and infrared panels. No special hybrid-specific maintenance is required.

Can a hybrid sauna be installed outdoors?

Only if the specific model is rated for outdoor use. Some hybrid saunas are designed with weather-resistant cabins, while others are indoor-only. Always check the product description before installation.

Why choose a hybrid sauna instead of a single type?

Hybrid saunas offer the widest range of heat options in one cabin. They provide fast infrared warm-up, higher traditional sauna temperatures, optional steam, flexible sessions for different users, and year-round usability regardless of heat preference.