CenturaHeat
CenturaHeat 4 Person Combination Bio Indoor Sauna
CenturaHeat 4 Person Combination Bio Indoor Sauna
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Estimated Delivery: 31st December 2025 - 15th January 2026
Blending advanced infrared heating with smart technology, the 4 Person Combination Bio Indoor Sauna provides a rejuvenating wellness experience for families or small groups. Built from durable Canadian Hemlock, this elegant cabin combines infrared carbon fibre panels with deep infrared light elements, offering a modern and effective approach to full-body relaxation.
Advanced Dual Heating
With 3400W of combined carbon fibre and infrared light output, this sauna delivers tailored therapy to ease muscle tension, improve circulation, and support detoxification. Adjust heat, session time, and lighting effortlessly via the digital control panel or the mobile app.
Entertainment & Lighting
- FM radio, Bluetooth, USB MP3, and two built-in speakers.
- Two LED reading lights with optional colour-changing star lights.
- Optional oxygen ioniser for fresher, cleaner air.
Comfortable & Personalised
Designed for up to four people, this sauna strikes the perfect balance between space and intimacy. With a temperature range of 18–65ºC and sessions lasting up to 99 minutes, every experience can be tailored to your preference—whether a quick recovery session or a longer, restorative escape.
Specifications
- Dimensions: 1800 × 1200 × 2000 mm (W × D × H)
- Power: 3400W
- Voltage: 230V
Included Accessories
- Towel rack
- Bucket & ladle
- Sand timer
- Thermo-hygrometer
- Oxygen ioniser (optional)
Assembly & Warranty
Delivered flat-packed with clear instructions and a video guide for easy assembly. Warranty: 1 year on electrical components, 2 years on wood.
*Please note: installation requires a qualified electrician to hardwire into mains.
A Better Way to Unwind
Owning a sauna at home is about more than just heat—it’s about privacy, comfort, and control. Unlike public spas, your sauna is always clean, always available, and always yours. Much like the difference between sinking into your own sofa versus sharing a seat on public transport, the comfort is incomparable. No queues, no strangers—just pure relaxation whenever you need it.
Features
- Dimensions: 180 × 120 × 200 cm
- Capacity: 4 people
- Heater Type: Infrared carbon fibre & infrared light
- Width: 1800 mm
- Depth: 1200 mm
- Height: 2000 mm
- Power Output: 3400 W
Heater Types & Benefits
- Carbon: Far (IR-C) – Gentle, even heat.
- Ceramic: Mid & Far (IR-B/C) – Quick warm-up with focused heat.
- Tourmaline: Far (IR-C) – Gentle warmth with a calming effect.
- Quartz: Near & Mid (IR-A/B) – Rapid, powerful heat.
FAQ
How much does it cost to run a sauna?
Running costs depend on wattage and usage time. Our saunas range from 2kW to 10kW. On average, an hour’s use costs between £0.50 and £2.50. For more details, use an electricity cost calculator.
What warranties do you offer?
- Electrical components: 1 year
- Wooden parts: 2 years
Are the saunas easy to assemble/install?
Yes. All saunas include clear assembly instructions. Most panels are secured with buckles or clamps, with minimal screwing required. Infrared saunas plug into a standard household socket, while traditional steam saunas must be hardwired to the mains by a qualified electrician.
How hot do the saunas get?
- Traditional steam saunas: 18–99°C, set via the control panel (0–90 mins).
- Infrared saunas: up to 65°C.
When should I add water to the stones?
Only add water once the stones are fully heated. Adding water too soon reduces steam quality and may damage the heater.
How do I know when the stones are hot enough?
The stones should feel intensely hot when you bring your hand close (without touching). Many heaters also have gauges – wait until it reads at least 300°F (approx. 150°C).
What type of water should I use?
Use clean, distilled water where possible. Tap water with high mineral content may cause limescale build-up over time.
Do I need to take anti-mould precautions?
Generally no, but if your sauna is in a very humid space, keep the area as dry as possible.
What cable size is required?
- 3000W saunas: 2.5 mm supply cable
- 4500W saunas: 4 mm supply cable
Do I need an RCD for a steam sauna?
Yes, RCD protection is required. Please consult a qualified electrician.
Is the sauna delivered assembled?
No, saunas are delivered flat-packed. Assembly is simple, with video and PDF guides included.
How long does it take to heat up?
At an ambient temperature of 10°C:
- ~15 minutes to reach 50°C
- ~30 minutes to reach 70°C
Does the exterior timber get hot?
The outside becomes warm but remains safe to touch, even for children.
Can the exterior be painted?
Yes, it can be painted with suitable wood-coloured paint.
What type of wood is used?
All our saunas are crafted from Canadian Hemlock.
What is an oxygen ioniser?
An optional negative ion generator that freshens the air. Please contact us for pricing.
Are stones included with the heater?
Yes, sauna stones are supplied – rinse thoroughly before use.
Does the control system include a mobile app?
Yes, the control panel includes app connectivity. Please check the product description for confirmation.
How much do replacement heater elements cost?
Please contact us for current pricing on replacement parts.
Delivery
Most saunas are delivered in 3–5 flat-packed boxes or in a single wooden crate (please see the table below for details).
This product is delivered to kerbside only. The driver is not required to carry the package beyond this point.
Packaging Information
- Sauna Type: Infrared Light Saunas
- Weight: 300 kg+
- Number of Boxes: 3–5
- Format: Flat-packed
- Description
- Features
- FAQ
- Delivery
- Delivery & Returns
Estimated Delivery: 31st December 2025 - 15th January 2026
Blending advanced infrared heating with smart technology, the 4 Person Combination Bio Indoor Sauna provides a rejuvenating wellness experience for families or small groups. Built from durable Canadian Hemlock, this elegant cabin combines infrared carbon fibre panels with deep infrared light elements, offering a modern and effective approach to full-body relaxation.
Advanced Dual Heating
With 3400W of combined carbon fibre and infrared light output, this sauna delivers tailored therapy to ease muscle tension, improve circulation, and support detoxification. Adjust heat, session time, and lighting effortlessly via the digital control panel or the mobile app.
Entertainment & Lighting
- FM radio, Bluetooth, USB MP3, and two built-in speakers.
- Two LED reading lights with optional colour-changing star lights.
- Optional oxygen ioniser for fresher, cleaner air.
Comfortable & Personalised
Designed for up to four people, this sauna strikes the perfect balance between space and intimacy. With a temperature range of 18–65ºC and sessions lasting up to 99 minutes, every experience can be tailored to your preference—whether a quick recovery session or a longer, restorative escape.
Specifications
- Dimensions: 1800 × 1200 × 2000 mm (W × D × H)
- Power: 3400W
- Voltage: 230V
Included Accessories
- Towel rack
- Bucket & ladle
- Sand timer
- Thermo-hygrometer
- Oxygen ioniser (optional)
Assembly & Warranty
Delivered flat-packed with clear instructions and a video guide for easy assembly. Warranty: 1 year on electrical components, 2 years on wood.
*Please note: installation requires a qualified electrician to hardwire into mains.
A Better Way to Unwind
Owning a sauna at home is about more than just heat—it’s about privacy, comfort, and control. Unlike public spas, your sauna is always clean, always available, and always yours. Much like the difference between sinking into your own sofa versus sharing a seat on public transport, the comfort is incomparable. No queues, no strangers—just pure relaxation whenever you need it.
- Dimensions: 180 × 120 × 200 cm
- Capacity: 4 people
- Heater Type: Infrared carbon fibre & infrared light
- Width: 1800 mm
- Depth: 1200 mm
- Height: 2000 mm
- Power Output: 3400 W
Heater Types & Benefits
- Carbon: Far (IR-C) – Gentle, even heat.
- Ceramic: Mid & Far (IR-B/C) – Quick warm-up with focused heat.
- Tourmaline: Far (IR-C) – Gentle warmth with a calming effect.
- Quartz: Near & Mid (IR-A/B) – Rapid, powerful heat.
How much does it cost to run a sauna?
Running costs depend on wattage and usage time. Our saunas range from 2kW to 10kW. On average, an hour’s use costs between £0.50 and £2.50. For more details, use an electricity cost calculator.
What warranties do you offer?
- Electrical components: 1 year
- Wooden parts: 2 years
Are the saunas easy to assemble/install?
Yes. All saunas include clear assembly instructions. Most panels are secured with buckles or clamps, with minimal screwing required. Infrared saunas plug into a standard household socket, while traditional steam saunas must be hardwired to the mains by a qualified electrician.
How hot do the saunas get?
- Traditional steam saunas: 18–99°C, set via the control panel (0–90 mins).
- Infrared saunas: up to 65°C.
When should I add water to the stones?
Only add water once the stones are fully heated. Adding water too soon reduces steam quality and may damage the heater.
How do I know when the stones are hot enough?
The stones should feel intensely hot when you bring your hand close (without touching). Many heaters also have gauges – wait until it reads at least 300°F (approx. 150°C).
What type of water should I use?
Use clean, distilled water where possible. Tap water with high mineral content may cause limescale build-up over time.
Do I need to take anti-mould precautions?
Generally no, but if your sauna is in a very humid space, keep the area as dry as possible.
What cable size is required?
- 3000W saunas: 2.5 mm supply cable
- 4500W saunas: 4 mm supply cable
Do I need an RCD for a steam sauna?
Yes, RCD protection is required. Please consult a qualified electrician.
Is the sauna delivered assembled?
No, saunas are delivered flat-packed. Assembly is simple, with video and PDF guides included.
How long does it take to heat up?
At an ambient temperature of 10°C:
- ~15 minutes to reach 50°C
- ~30 minutes to reach 70°C
Does the exterior timber get hot?
The outside becomes warm but remains safe to touch, even for children.
Can the exterior be painted?
Yes, it can be painted with suitable wood-coloured paint.
What type of wood is used?
All our saunas are crafted from Canadian Hemlock.
What is an oxygen ioniser?
An optional negative ion generator that freshens the air. Please contact us for pricing.
Are stones included with the heater?
Yes, sauna stones are supplied – rinse thoroughly before use.
Does the control system include a mobile app?
Yes, the control panel includes app connectivity. Please check the product description for confirmation.
How much do replacement heater elements cost?
Please contact us for current pricing on replacement parts.
Most saunas are delivered in 3–5 flat-packed boxes or in a single wooden crate (please see the table below for details).
This product is delivered to kerbside only. The driver is not required to carry the package beyond this point.
Packaging Information
- Sauna Type: Infrared Light Saunas
- Weight: 300 kg+
- Number of Boxes: 3–5
- Format: Flat-packed
Order Confirmation: As soon as you place your order, we will pre-authorise your card however your card will not be charged. We will then contact our supplier to confirm that the product you have purchased is available for immediate shipment. Once confirmed we will process the payment and your order will be dispatched straight away. If there is any delay such as an item which is on backorder, we will void the pre-authorisation and contact you to let you know.
Order Delivery: Once your order has been placed, assuming it is in stock and available for dispatch, we will charge your card and your order will be dispatched within 5 working days. We’ll send you tracking details by email within 24 hours of your order being dispatched. If you have not received tracking details within 6 working days, please reach out to us via email at contact@gymsphere.co.uk so that we can help.
Damages: We ask that you thoroughly inspect all items at the point of delivery. We advise you not to accept delivery of any damaged items. If you discover that an item has been damaged, please send clear photos of the damaged items
to contact@gymsphere.co.uk so that we can open an insurance claim on your behalf.
Cancellations & Refunds: Any orders cancelled after 48 hours of placing the order may be subject to additional fees. If your order has been dispatched, you (the buyer) will be responsible for any costs associated with returning the item. Any refunds can only be issued to the same payment method which was used to place the order.