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Thermowood – the best solution for manufacturing saunas

Thermowood is one of the best materials for the manufacturing of saunas and hot tubs, as well as for construction, decoration, interior design, and rooms with high humidity. This is due to the excellent performance and decorative properties.

To make it long lasting, the materials used in the manufacturing of saunas and wooden hot tubs must have high moisture resistance and be less prone to decay. That is why the best option is heat-treated wood.

Thermowood Production Technology

To produce Thermowood you should treat the ordinary woods in an airless environment with high temperatures. Manufacturing technology of Thermowood differs from conventional woodworking. It is a thermal treatment of wood at 185-205°C so that the material acquires unique properties and becomes almost eternal. Unlike usual, the sauna from the heat-treated wood does not absorb moisture and does not rot, does not crack. And over time, there are no cracks between the boards. This wood is geometrically stable, has a pronounced texture, and has antiseptic properties.

The thing is that during the processing the cellular structure of the wood changes. It becomes as dry as if it has been drying for several hundred years. Resin completely evaporates from wood, and it acquires a deep, dark colour, its thermal conductivity decreases, strength increases, and water absorption significantly decreases (by 3–5 times as compared to ordinary wood).Besides, the material is weakened dramatically and strained. As a result, Thermowood saunas remain more stable with the changing temperature and humidity and retain their geometry.

Thermowood – the best solution for manufacturing saunas

Wood and the elements that make up the sauna determine its durability and comfort of use. The shelves made of ordinary wood heat up much harshly than Thermowood. Sometimes, sitting and lying on them feels uncomfortable even after covering it with a sheet or towel. Unlike conventional wood, Thermowood heats up much less. Even when the heat set to the max limit, this material has a comfortable temperature for human, eliminates the risk of burning, and, therefore, increases the safety of staying in the steam room.

Sauna Interior Design: unlimited possibilities of Thermowood

The colour and texture of the Thermowood depend on the type of wood and the processing temperature. Wood of any species that is heat-treated can have at least 2 shades and 2 types of texture. It offers unlimited possibilities for your fantasy in the interior design of the sauna.

In general, alternating bars of different colours can achieve an unprecedented effect. Moreover, heat-treated wood, unlike conventional wood, does not change colour and texture during operation in conditions like high temperature and humidity.

Sitting on the shelves of absolutely smooth heat-treated wood feels so nice. Also, with a clear drawing of the texture, as well as uniform, vibrant shades, this material can serve as a real decoration of the interior.

The Advantages of Using a Thermowood Sauna

  • Eco-friendly and does not emit harmful substances into the atmosphere.

  • A high wear resistance and durability.

  • It is more resistant to rot or mold than untreated wood.

  • Thermowood Sauna will be less deformed due to extremes temperature and under the influence of moisture than a sauna made of spruce

  • It has high thermal insulation properties.

  • Various colours and shades.

  • Safe to use.

The disadvantage is the high cost (compared to the conventional wood) due to the technological difficulties faced in the production of Thermowood but it's worth the cost

If you are interested in bringing a piece of Scandinavia to your garden call us today for a quote.


Handcrafted BaltoScandia Garden Saunas now available for sale in the UK by Penguin Spas

Our new and exclusive range of Electric and wood fired BaltoScandia outdoor saunas are specially crafted from Nordic Thermowood and Canadian Red Cedar (Holls by BaltoScandia only) which radiates warmth and gives them a natural and authentic feel to make them truly inviting to step into and relax. We have the most popular outdoor garden sauna styles and shapes for you to offer. Starting from traditional barrel saunas, sauna cubes, sauna cabins to many variations of modern saunas.

Traditional Scandinavian Sauna Barrels

BaltoScandia produces more 9 models of outdoor sauna barrels with different shapes and sizes. Each model has a unique inside layout for the most efficient space usage.

Nordic Garden Sauna Cubes

Embrace the Nordic wellness culture with our luxury range of outdoor saunas cubes that encapsulate pure, clean, modern design, powered by dedication and craftmanship

Sauna Cabins made from thick spruce logs

Our sauna cabins provide a haven of tranquillity and place to unwind. This sauna cabin is constructed of solid, thick spruce log sections that are profiled for a precise fit.

Oval Saunas

The oval sauna models have been carefully designed with the sauna barrel in mind by increasing the inner volume to allow a steam room and a wellbeing chill zone for you to relax.

Holls by BaltoScandia

Explore our exclusive range of Holl's by BaltoScandia Outdoor Garden Sauna Collection. Let yourself be transported by the beautiful Canadian red cedar wood and its distinctive smell.

Sauna Accessories

BaltoScandia sauna accessories for any sauna; buckets, ladles, oils, sand timers, thermometers, headrests, birch brooms and much more. Make your sauna sleek & stylish with our range of accessories.


As our company has grown so has our passion to create amazing outdoor spaces

Whatever style garden you have, large or small, you want it to be a place that you can relax in, and escape to. As well as the obvious perks of getting more fresh air and sunlight, there are lots of other benefits of an ideal outdoor living spaces.

Creating an outdoor living space will provide an additional space in your home to relax and unwind. Expand the space that you already have available to you. A casual living space in the garden is also the perfect place to entertain guests, to provide seating, and mingling space to enjoy evening drinks or a BBQ. Create a functional and enjoyable area for you and your family to use in the garden, whatever the weather.

BBQ Huts / Grill Cabins

Explore our exclusive range of BaltoScandia Grill Cabins & BBQ Huts available to view at our Penguin Spas Outdoor Living Showroom in South Lanarkshire, Scotland. Our Scandinavian BBQ Huts are built in the traditional Lappish style of Northern Finland and offer the year-round dining culture that the Scandinavians have.

Garden Rooms and Home Offices

BaltoScandia garden room can be built to serve any purpose with some of the most popular uses being garden offices, garden gyms and bar/cinema rooms. With our bespoke garden rooms option, you can tailor your luxury garden room for any purpose imaginable, with multipurpose functionality and designs.

Glamping Pods - Comfortable Outdoor Living

Our range of BaltoScandia Glamping Pods are a great choice for tourists and holiday makers who want to relax after an adventure. Because of the feeling of a home’s atmosphere in outdoor setting, with the unique characteristics of each design.

Premium Cedar Gazebo's & Pavilions

Every BaltoScandia Gazebo is built with 100% premium Cedar Lumber giving your BaltoScandia Gazebo a distinctive, premium look and feel. The ability of Cedar to bring warmth and character to a backyard project just can’t be matched by plastic or other man-made materials.

Eco-friendly Composite Decking

Our exclusive range of composite decking is a hi-tech eco-friendly alternative to traditional wooden decking all featured at our award-winning Eco Premium Outdoor Living Showroom. Our decking brings the natural look of wood to your outside space without the associated problems of cracking, splitting, warping and excessive maintenance requirements.

Alfa Forni Pizza Ovens

If you’re looking for the best outdoor wood and gas-fired pizza oven in Scotland, we have the right solution for you. Alfa ovens are made for those who love the traditional taste of Italy and want to try a real superior cooking experience.

RB73 Wood Burning Garden Stoves

Each RB73 wood burning garden stove are handmade by professionals with love for the product. Enjoy beautiful moments, enjoy staying outside! Think of warm summer evenings, but also throughout the rest of the year there are often beautiful days when an outdoor fireplace can be used to give that wonderful extra warmth and atmosphere on your terrace.


About Penguin Spas Premium Outdoor Living

Here at Penguin Spa Premium Outdoor Living, we are passionate about delivering the best quality hot tubs, best in energy efficiency, great value for money, and unbeatable customer service. Our friendly team is here to help you choose the right hot tub for your needs and your budget.

Award Winning Penguin Spas Premium Outdoor Living Showroom - Scotland

Our new Scottish outdoor living showroom is an oasis of calm, showcasing a large selection of multiple award-winning hot tubs and accessories we have to offer. Based in Yieldshields, near Carluke – right in the central belt of Scotland – we are within easy reach of the M74 & M8 motorway network and less than 35-minute drive to the city of Edinburgh and Glasgow.

Since 2012, Penguin Spas Outdoor Living have been devoted at creating and supplying elaborate products which are all designed to help improve people’s health, wellbeing, wellness, and happiness.

All our premium products are carefully designed and manufactured, and we strive to constantly improve ourselves and the products we deliver. We embrace new technologies and understand the importance of delivering reliable and durable products which help to improve our customers lives.

Do you want to know more about our range of multiple award-winning, energy efficient hot tubs available here in Scotland?

Here at Penguin Spas, we are proud to be the only official Scottish dealer of award-winning, energy efficiency gold standard hot tubs and swim spas from UK designed Sunbeach Spas and the world’s premier spa brand Oasis Spas

Both manufacturers of the Sunbeach Spas and the Oasis Spas have created a complete insulation energy saving system that reduces energy consumption to save you money. You can have peace of mind that your hot tub or swim spa will be hot and ready for you, without costly energy bills.

Sunbeach Spas are leading the hot tub and swim spa industry with energy efficient SmartSpa™ R10 insulation and cutting-edge technology. The multiple award-winning Sunbeach Spas are all designed here in the UK and are manufactured with the newest industry features which the company consistently pushes the industry forward with innovative designs and features.

Eco Spas are committed at improving the wellbeing of people and the health of our planet. Eco Spas is proud to be at the forefront of energy efficiency hot tub design and manufacture. Each of our holiday park hot tubs have been carefully designed here in the UK in compliance with current safety guidance written by the Health and Safety Executive (HSG282) which provides constant efficiency and immediate use while ensuring utmost hygiene and guaranteeing the easiest maintenance possible resulting in an experience that becomes an asset to your business.

Oasis Spas are built by one of the world’s largest international hot tub and swim spa manufacturers who distribute products in 40 countries around the world. Oasis Spas are built to last with premium components and the thickest shells on the market. The Power Saver Technology with SmartSpa+™ R10 insulation will save you thousands over the life of your hot tub or swim spa and the Easy-Care Technology makes maintenance simple.


Air Source Heat Pumps for Swimming Pools and Hot Tubs

The Poolex air-to-water heat pump (AWHP) provides hot water directly to your swimming pool or hot tub without using fossil fuels, providing a low carbon solution for an efficient, comfortable experience. Poolex uses 75% of natural energy absorbed from outside air and the rest of 25% comes from electricity.

Air Source Heat Pumps with Full Inverter Technology - Experience the luxury of total comfort with our new range of Poolex, energy efficient air source heat pumps designed for swimming pool and hot tubs. Never let the British weather control your swimming pool or hot tub enjoyment again. Pool and Hot Tub heaters provide the ultimate in spa water comfort letting you choose the perfect temperature all year round.


Handcrafted BaltoScandia Wood Fired Hot Tubs

Peaceful, natural relaxation can be yours every day with a wood-fired hot tub. Wood fired bathing in a hot tub creates the most elemental and authentic outdoor bathing experience. If you’ve ever soaked in water heated only by wood, you’ll know it's much richer than just the bathing: it's the splitting and stacking of firewood, the methodical stirring and preparation of the water, the sound of the crackling fire, the anticipation of the heat.

Traditional Wood Fired Hot Tubs

Choose the very best from our range of traditional Scandinavian wood fired hot tubs that have been designed to be simple and timeless with an elemental everlasting design.

Fiberglass Wood Fired Hot Tubs

Choose from our exclusive premium collection of BaltoScandia eco-friendly handcrafted luxury fiberglass wood fired hot tubs with Scandinavian Thermowood cladding.

Stainless Steel Wood Fired Hot Tubs

View our beautifully UK designed stainless steel wood fired hot tubs. Our range of Stainless-steel hot tubs are eco-friendly in the environment and green by their nature

Plunge Ice Cold Tubs

Cold water and ice therapy with our plunge tub. After enjoying the hot tub or sauna, many bathers will quickly cool themselves down by getting into a cold plunge pool or ice bath.

Read our Blogs on Wood Fired Hot Tubs & Ice Tubs

There are a number of great health benefits to soaking in a wood fired hot tub in all sessions, such as stress relief, muscle relaxation, improve sleep, pain relief, calorie burn and much, much more - our team of hot tub experts have put together informative blogs all relating to wood fired hot tubs and cold tubs for you to read and enjoy.


Contact Us

Address: Thornhome House, Yieldshields, Carluke, South Lanarkshire, Scotland, ML8 4QD

Telephone: 0800 112 3886 or 01555 729 607


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