Hot Tub Delux Internal

Efficient heating, simplest wood-fired setup

Price

£4,195 inc VAT & Delivery Included

Complete DIY Assembly Kit

Every Order Plants 5 Trees

Professional Installation

Comprehensive Warranty

Free UK Mainland Delivery

Choose your installation

Choose your sauna heater

Choose your add-ons

About

Heat with nothing lost along the way. Deluxe Tub Internal places the wood burner inside the tub itself, heating water directly without any pipework losses between a separate firebox and the bath. 180cm of Thermowood holds two to three bathers comfortably, with a small partition keeping everyone safely clear of the firebox. A self contained, efficient setup for anyone who values directness over maximum internal space.

Built for UK Weather

Built for UK Weather

Everything You Need to Install

Everything You Need to Install

Designed for Fast Heat-Up

Designed for Fast Heat-Up

Specification

  • Shape: Round
  • Accommodates: 2-3 People
  • Diameter: 180 cm
  • Max Height: 93 cm
  • Wall Thickness: 18 mm
  • Material: Thermowood
  • Assembly: Self-assembly
  • Insulated: No
  • Design Note: Wood-fired hot tub with internal heater
  • Power Supply: Single or Three Phase
  • Heater Compatibility: Electric & Wood-Fired

Designed around your ritual

Full Glass Back Window

Full Glass Back Window

Bring the outdoors in. A full glass rear window fills the sauna with natural light and opens up wider scenic views.
Half Moon Back Window

Half Moon Back Window

Privacy meets natural light. A half-moon rear window creates a softer, brighter feel while keeping more enclosed wall space.
Full Glass Front Barrel

Full Glass Front Barrel

Turn every session outward. Full front glazing opens the barrel sauna to natural light and uninterrupted outdoor views.
Full Glass Front Cube

Full Glass Front Cube

Modern design, open views. Full-height front glazing creates a brighter, cleaner space with a sharper architectural finish.
LED Lighting Kits

LED Lighting Kits

Set the perfect mood. Integrated LED lighting creates warmth and atmosphere, transforming the sauna experience day or night
Bluetooth Speakers

Bluetooth Speakers

Soundtrack your downtime. Built-in Bluetooth speakers bring music, podcasts, and guided sessions straight into your sauna.
Quality Accessories

Quality Accessories

Complete the experience properly. Practical finishing touches that improve comfort, convenience, and the overall sauna ritual.
Premium Thermowood

Premium Thermowood

Built to age beautifully. Thermowood offers a richer finish, stronger durability, and better long-term performance.
An internal burner design brings the heat source directly into the water itself, which many users find results in noticeably efficient warming compared with transferring heat from an external unit. The core wellbeing benefits of wood fired hot tub bathing remain the same regardless of burner position: warm water immersion improves circulation, eases muscle tension, and the ritual of tending a fire to heat your own bathing water adds a deliberate, calming process that an instant electric spa simply can't replicate.

For households who value simplicity in their setup, an internal burner removes the need to position, plumb, and maintain a separate external heating unit, streamlining the whole installation to a single self-contained structure. This can make the wood fired bathing ritual feel more accessible for anyone slightly daunted by a multi-component external system, while still delivering the same authentic experience.

The efficiency of direct internal heating also means less waiting and less firewood typically needed to reach a comfortable soaking temperature compared with some external configurations, which supports more frequent, spontaneous use rather than reserving the tub for occasions where a longer heating commitment feels worthwhile. For couples or small households building wood fired bathing into a regular routine, that efficiency genuinely matters over the course of a season.
Delivered flat-packed for self-assembly, with free UK mainland delivery on qualifying orders. The larger Cube format requires a little more assembly time than the smaller Icon models, so we recommend allowing a weekend and having a second person to help. A solid, level base and suitable delivery access are required.

For a complete setup, select Professional Installation and choose your preferred date, allowing for the stated production lead time. We’ll then arrange the installation around your requirements, including any additional preparation or works needed to accommodate your sauna where possible.

Electric sauna heaters require a suitable dedicated electrical supply and are not simply plug-and-play. The power requirements depend on the heater's output and the electrical supply available at the property.

Smaller heaters may be suitable for a 230V single-phase supply, while larger or more powerful heaters can require a 400V three-phase supply. Single-phase power uses one electrical phase, whereas three-phase power distributes the load across three phases and is better suited to higher-powered equipment.

The correct supply will depend on the specific heater you choose, so the heater's electrical requirements should always be checked before installation.

Sauna heaters will normally need to be hard-wired into a correctly rated dedicated circuit with the appropriate cable, isolation and electrical protection. They should not be connected using a standard household plug or extension lead.

The final electrical connection should be completed by a suitably qualified electrician in accordance with the heater manufacturer's instructions and applicable electrical regulations. This is important for both safety and reliable operation of the heater.

If you're based in the Leicestershire area, we can arrange the electrical installation of your sauna heater for an additional fee. Please speak to our team if you'd like this included with your sauna.

Wood-fired sauna heaters do not require an electrical supply for heating, but they do require the correct installation of the stove, chimney, flue and surrounding heat protection.

The stove must be positioned according to the manufacturer's required safety distances from timber walls, benches and other combustible materials. Depending on the stove and sauna design, suitable heat shields or other non-combustible protection may also be required.

The floor beneath and immediately around the stove may also require suitable non-combustible protection, particularly where there is a risk of embers or hot material falling from the stove.

A suitable chimney and flue system must be installed to safely carry smoke and combustion gases outside the sauna. Where the flue passes through the roof, the correct insulated chimney components, roof flashing and heat-resistant protection should be used.

Correct ventilation is also important. A wood-fired stove requires an adequate supply of combustion air, while the sauna itself needs sufficient airflow to provide fresh air, circulate heat and allow moisture to escape.

When choosing the position of an outdoor wood-fired sauna, you should also consider where the chimney will discharge in relation to your house, neighbouring properties, windows, boundaries and outdoor seating areas.

Any applicable local requirements should be checked before installation, particularly where chimney positioning, smoke control or other restrictions may apply.

Caring for an internal burner wood fired hot tub follows similar principles to external designs, with some specific attention to the integrated heater. After each session, let the firebox cool fully before clearing ash, taking care given its position within the tub structure itself, and check for good airflow before lighting again.

Drain and refresh the bathing water regularly depending on usage, and wipe down the interior periodically, checking around the internal burner housing for any signs of wear or leaking where it meets the main tub structure. This junction is worth checking slightly more carefully than the joints on an external burner model, simply because of its position within the bathing volume.

Thermowood's natural weather resistance keeps general exterior maintenance minimal. A light oil treatment every couple of years maintains the original colour if preferred, otherwise letting the timber weather naturally to a silvery grey requires no upkeep at all. Check the internal burner's components for soot build-up periodically, since this affects heating efficiency over time regardless of burner position.
This tub comes with a 5 year warranty for residential use and 2 years for commercial use, covering structural timber and hardware. Valid claims are assessed case by case, and we'll supply replacement parts wherever possible rather than the whole tub.
Production takes 2-4 weeks, plus 1-2 weeks dispatch time for pallet haulage. This tub is delivered flat packed unless otherwise stated. Free UK mainland shipping applies to orders over £500 covering up to one double pallet (2.4m x 1.2m x 2.2m) or two single pallets (1.2m x 1.2m x 2.2m). If your order exceeds this due to length, weight, or quantity, additional pallet charges may apply and are quoted separately based on postcode. Please have a solid base, clear access, and suitable unloading space ready before delivery. Pallet deliveries are kerbside only, and you're responsible for moving goods onto your property.
Health Benefits
Assembly & Installation
Delivered flat-packed for self-assembly, with free UK mainland delivery on qualifying orders. The larger Cube format requires a little more assembly time than the smaller Icon models, so we recommend allowing a weekend and having a second person to help. A solid, level base and suitable delivery access are required.

For a complete setup, select Professional Installation and choose your preferred date, allowing for the stated production lead time. We’ll then arrange the installation around your requirements, including any additional preparation or works needed to accommodate your sauna where possible.
Electric Heater Setup

Electric sauna heaters require a suitable dedicated electrical supply and are not simply plug-and-play. The power requirements depend on the heater's output and the electrical supply available at the property.

Smaller heaters may be suitable for a 230V single-phase supply, while larger or more powerful heaters can require a 400V three-phase supply. Single-phase power uses one electrical phase, whereas three-phase power distributes the load across three phases and is better suited to higher-powered equipment.

The correct supply will depend on the specific heater you choose, so the heater's electrical requirements should always be checked before installation.

Sauna heaters will normally need to be hard-wired into a correctly rated dedicated circuit with the appropriate cable, isolation and electrical protection. They should not be connected using a standard household plug or extension lead.

The final electrical connection should be completed by a suitably qualified electrician in accordance with the heater manufacturer's instructions and applicable electrical regulations. This is important for both safety and reliable operation of the heater.

If you're based in the Leicestershire area, we can arrange the electrical installation of your sauna heater for an additional fee. Please speak to our team if you'd like this included with your sauna.

Wood-Fired Heater Setup

Wood-fired sauna heaters do not require an electrical supply for heating, but they do require the correct installation of the stove, chimney, flue and surrounding heat protection.

The stove must be positioned according to the manufacturer's required safety distances from timber walls, benches and other combustible materials. Depending on the stove and sauna design, suitable heat shields or other non-combustible protection may also be required.

The floor beneath and immediately around the stove may also require suitable non-combustible protection, particularly where there is a risk of embers or hot material falling from the stove.

A suitable chimney and flue system must be installed to safely carry smoke and combustion gases outside the sauna. Where the flue passes through the roof, the correct insulated chimney components, roof flashing and heat-resistant protection should be used.

Correct ventilation is also important. A wood-fired stove requires an adequate supply of combustion air, while the sauna itself needs sufficient airflow to provide fresh air, circulate heat and allow moisture to escape.

When choosing the position of an outdoor wood-fired sauna, you should also consider where the chimney will discharge in relation to your house, neighbouring properties, windows, boundaries and outdoor seating areas.

Any applicable local requirements should be checked before installation, particularly where chimney positioning, smoke control or other restrictions may apply.

Cleaning & Care
Caring for an internal burner wood fired hot tub follows similar principles to external designs, with some specific attention to the integrated heater. After each session, let the firebox cool fully before clearing ash, taking care given its position within the tub structure itself, and check for good airflow before lighting again.

Drain and refresh the bathing water regularly depending on usage, and wipe down the interior periodically, checking around the internal burner housing for any signs of wear or leaking where it meets the main tub structure. This junction is worth checking slightly more carefully than the joints on an external burner model, simply because of its position within the bathing volume.

Thermowood's natural weather resistance keeps general exterior maintenance minimal. A light oil treatment every couple of years maintains the original colour if preferred, otherwise letting the timber weather naturally to a silvery grey requires no upkeep at all. Check the internal burner's components for soot build-up periodically, since this affects heating efficiency over time regardless of burner position.
Warranty
This tub comes with a 5 year warranty for residential use and 2 years for commercial use, covering structural timber and hardware. Valid claims are assessed case by case, and we'll supply replacement parts wherever possible rather than the whole tub.
Delivery
Production takes 2-4 weeks, plus 1-2 weeks dispatch time for pallet haulage. This tub is delivered flat packed unless otherwise stated. Free UK mainland shipping applies to orders over £500 covering up to one double pallet (2.4m x 1.2m x 2.2m) or two single pallets (1.2m x 1.2m x 2.2m). If your order exceeds this due to length, weight, or quantity, additional pallet charges may apply and are quoted separately based on postcode. Please have a solid base, clear access, and suitable unloading space ready before delivery. Pallet deliveries are kerbside only, and you're responsible for moving goods onto your property.

Direct, efficient internal wood heating

The Deluxe Tub Internal is built with its wood burner positioned inside the tub itself, a traditional configuration that keeps the heat source within the water rather than mounted externally. At 180 centimetres in diameter and 93 centimetres deep, it is sized for relaxed use by two or three people, with Thermowood construction handling the moisture resistance needed for a tub that spends its life outdoors full of heated water across every season.

An internal burner heats the water more directly than an external stove, since there is no heat loss through connecting pipework between a separate firebox and the tub itself, though it does mean the burner occupies some of the internal space and needs a small partition to keep bathers safely away from the firebox while it is in use. This configuration tends to suit anyone who values heating efficiency and a more traditional wood fired tub experience over maximising every last inch of internal space for bathers.

Deluxe Tub Internal is a solid choice for anyone wanting a straightforward, efficient wood fired hot tub without the added complexity of a separate external heating system to install and connect, keeping the whole setup as one self contained unit that arrives, sits in the garden, and gets used without any further plumbing or installation considerations beyond a level, stable base.

From Your Sketch
To Reality ✏️

A sauna built entirely around your space, your ideas and how you want it to feel.

Send us your hand-drawn sketches, and we’ll turn them into detailed CAD designs ready to bring your vision to life.

Chat With Us →
Bespoke wood-fired sauna and wellness space
Free Mainland UK Delivery Consistent Warmth Year Warranty Year-Round Use Heats Up Fast
Free Mainland UK Delivery Consistent Warmth Year Warranty Year-Round Use Heats Up Fast
Free Mainland UK Delivery Consistent Warmth Year Warranty Year-Round Use Heats Up Fast
Close

Built on Tradition. Perfected for Today.

Classic Scandinavian design, refined with premium materials, precise craftsmanship and enduring performance.

Designed to Heat Efficiently

Every curve has a purpose, helping your sauna reach temperature faster while delivering an even, enveloping warmth.

Crafted from Exceptional Thermowood

Heat-treated for durability and stability, our premium timber is chosen for its natural beauty and long-lasting performance.

Premium Tempered Safety Glass

Our premium tempered glazing delivers a refined finish, excellent durability and complete confidence in every sauna.

Frequently Asked Questions

5-Year Guarantee

5-Year Guarantee

Built for years of wellness and relaxation

Free UK Mainland Delivery

Free UK Mainland Delivery

Free delivery throughout England, Wales, and Scotland.

Expert Help, When You Need It

Expert Help, When You Need It

Friendly specialist support before and after your purchase.

Become a Wellness VIP

Sign up free for early sale access and member-only discounts.

By subscribing, you agree to our Terms & Privacy Policy and consent to marketing emails.