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  • A modern indoor sauna with a bright roomy interior. Compact dimensions that can fit great in a bathroom, basement, or home gym. Reward yourself with a dry sauna session after a long day.
  • 3D product model
  • A modern indoor sauna with a bright roomy interior. Compact dimensions that can fit great in a bathroom, basement, or home gym. Reward yourself with a dry sauna session after a long day.
  • A modern indoor sauna with a bright roomy interior. Compact dimensions that can fit great in a bathroom, basement, or home gym. Reward yourself with a dry sauna session after a long day.
  • A modern indoor sauna with a bright roomy interior. Compact dimensions that can fit great in a bathroom, basement, or home gym. Reward yourself with a dry sauna session after a long day.
  • A modern indoor sauna with a bright roomy interior. Compact dimensions that can fit great in a bathroom, basement, or home gym. Reward yourself with a dry sauna session after a long day.
  • A modern indoor sauna with a bright roomy interior. Compact dimensions that can fit great in a bathroom, basement, or home gym. Reward yourself with a dry sauna session after a long day.
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Thermowood Indoor Sauna - 4 Person

$ 4,999

Availability: 3 to 5 Weeks Lead Time

A modern indoor sauna with a bright roomy interior. Compact dimensions that can fit great in a bathroom, basement, or home gym. Reward yourself with a dry sauna session after a long day.

Heater:
Heater
Read Heater Details Upgrades:
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Pay Over Time With Affirm

Finance your dream indoor sauna with interest rates as low as 0% APR for 24 months. Learn More

Healthy Living

Intentional heat exposure has been shown to provide a range of health benefits, better sleep, lower stress, and less muscle & joint pain are waiting for you

Relax and Recharge

Whether after workout or a long day of work, find a place to find a moment of peace in the heat, step out ready to perform at your peak

Easy Assembly

High-quality parts that fit together seamlessly and easy to follow instructions. This is a DIY project you will have fun doing

Customer Reviews & Photos

Assembly

Get Our Free Product Assembly Manual

Product Details

Have questions about our indoor saunas? Call us now on 1800 567 8036.

Every Redwood Outdoors Indoor Sauna kit comes complete with a Harvia electric heater, sauna rocks, and interior seating benches. Our saunas will heat up to 195 F in under an hour, and can be enjoyed either wet or dry, catering to a true Scandinavian sauna experience.

Thermowood Construction 

Thermowood is created by heat treating Scandinavian softwood to temperatures ranging from 180 – 230° in special chamber kilns for up to 96 hours. Steam is used as a protective gas and helps to prevent the wood from splitting and becoming damaged during treatment.

Learn more about thermowood in our FAQ section!

Thermowood’s Characteristics & Qualities

This process causes chemical and structural changes to occur within the timber, which therefore alters some of its characteristics and qualities. Some of the characteristics and qualities that make Thermowood such a popular specie includes:

Dimensionally Stable – The intensive heat the wood is exposed to during its production dries out deep into the core, causing all moisture and resin to be removed from the timber. Thermowood therefore doesn’t react to changes in humidity as drastically as untreated wood (the risk of swelling, cracking and shrinkage is decreased), allowing it to retain its shape far better. The wood also doesn’t secrete sap or resin even in high temperatures.

Environemntally Friendly – The softwood used to produce Thermowood originates from well-managed, PEFC-certified forests, and as no chemicals or foreign substances are involved during its production, Thermowood is an environmentally friendly material produced by using only natural methods.

Resistance to Rot and Fungi – Due to the heating process breaking down hemicellulose, the wood doesn’t contain the appropriate nutrients to allow rot and fungi to grow and develop.

Increased Longevity – When wood is treated with heat, its average life span is prolonged meaning your sauna will last a lifetime!

Improved Insulation – Wood that has been heat treated is much more porous than untreated wood, vastly improving its insulating properties.

Traditional Scandinavian Design

This Scandinavian indoor sauna has a classic beauty in its elegant simplicity. Our indoor saunas are constructed with durable thermowood lumber that fit together forming a strong exterior. Not only are our indoor saunas lovely to look at, their design is incredibly energy efficient and helps to distribute the heat evenly throughout the interior.

Harvia Sauna Heater, Made In Finland

Harvia is the world’s leading sauna heater manufacturer and Harvia heaters are considered the industry gold-standard. Harvia is was established in Finland in 1950 and has built an international reputation for exceptional quality. With a Harvia heater, you know you are getting a reliable product that you and your family can trust. All our Harvia sauna heaters are ETL certified and are manufactured in Finland.

Manual Control or Wi-Fi Control Heater Options

Our manual control heaters have two dials: a temperature dial and a timer. The timer can be set for up to an 8-hour delay, meaning you set your heater to come on while you are out and your sauna will be ready when you get home.

Our digital Wi-Fi heaters can be controlled via the digital wall pad mounted nearby your sauna, or from any smartphone or tablet. The big convenience of the Wi-Fi control is the remote start capability which allows you to pre-heat your sauna from anywhere—whether at the office or on the slopes. With few taps on your phone, your sauna will be ready when you get home. Wi-Fi heaters can also be pre-set to come on at a specific time of day, such as early in the morning. 

Unfortunately, you cannot upgrade a manual control heater to a digital Wi-Fi system in the future. While the manual and digital heaters look very similar, they are in fact totally different heaters. This means you must select the control system you are going with at the outset.

Easy Self Assembly

Putting together the our sauna kits is easy! All our saunas are designed with the DIY customer in mind. All the pieces are pre-cut and grooved, so no sawing or cutting is required. 

Anyone with novice woodworking skills could build one in approximately 4 hours. All the assembler will need is a level, Phillips screwdriver, 7/16″ and 9/16″ open end wrenches, 9/16″ deep socket wrench, vise grips, and a mallet.

Shipping Across The USA

We ship our saunas to everywhere in the United States to sauna enthusiasts who enjoy the wellness benefits of heat and steam!

* Specifications are approximate and subject to change without notice, actual product dimensions may vary

Product Diagram

Specifications

Seating Capacity
4 people depending on the seating arrangement as well as the size and proximity of the bathers
Wood Type
Scandanavian Thermowood
Exterior Dimensions
54 ¼” L x 72 ½” W x 79 ½” H
Weight
800 lbs
Accessories Included
Bucket and ladle, backrest, sauna rocks, light fixture
Door
Tempered glass door included
Electrical Requirements
110V for lighting and 240V for heater
Light Fixture Dimensions
9" L x 9 ¼ W x 7" H

Packaging & Shipping Information

Shipping Format
Wooden crate
Shipping Dimensions
83 ½” L x 42” W x 38 ½” H
Our wooden saunas come with a 1-year limited warranty. For Harvia sauna heaters, Redwood Outdoors provides a 1-year warranty on heating elements and a 5-year limited warranty on other sauna heater components for residential usage. Please refer to https://www.redwoodoutdoors.com/warranty for detailed warranty information on our products.
  • We have carefully selected the very best sauna heaters on the market to pair with our saunas. So whichever heater you choose from us, you simply can’t go wrong. All of our heaters are excellent options and will give you a wonderful sauna experience.

    The main things to consider when choosing a heater are: aesthetic preference, wifi vs manual control, drier sauna vs more humid sauna, and of course your budget.

    If you have any questions, our Product Experts would love to help. Give us a call anytime at 1800 567 8036.

  • HARVIA KIP ELECTRIC HEATER

    HARVIA KIP ELECTRIC HEATER

    The KIP family of electric sauna heaters are traditional Finnish wall-mounted heaters. They heat up fast and reach high temperatures of ~190F within one hour. This design holds up to 40 lbs of rocks, on which you can douse water to create soothing steam. The KIP creates a relatively dry heat and you should expect ~15-25% relative humidity in the sauna. The KIP comes in an attractive stainless steel exterior case that easily mounts on your sauna wall.

    Harvia is the world’s leading sauna heater manufacturer and Harvia heaters are considered the industry gold standard. Harvia was established in Finland in 1950 and has built an international reputation for exceptional quality. With a Harvia heater, you know you are getting a reliable product that you and your family can trust. All our Harvia sauna heaters are ETL certified and are manufactured in Finland.

  • HARVIA CILINDRO ELECTRIC HEATER

    HARVIA CILINDRO ELECTRIC HEATER

    The Finnish word “löyly” is the name for the hot steam that rises from your sauna rocks after water has been carefully poured on top of them. The steam turns your sauna into a hot and humid paradise, capable of relaxing even the tensest muscles or stressed minds.

    The Cilindro specializes in creating a lot of steam. This is because the heater holds 160 lbs of rocks! All these rocks create a more even heat distribution and an incredible löyly that would make any Finn proud.

    The Cilindro has a slightly longer heat-up time than the KIP, due to the number of rocks and is designed to run at a lower absolute temperature. The temperature you should expect from this heater is ~165F, which is the perfect temperature for a steamy sauna (>30% relative humidity) to prevent scalding. Due to the higher humidity in the room, the perceived temperature in the sauna will feel comparable to a drier sauna running at a higher absolute temperature.

  • Harvia Spirit Heater

    HARVIA SPIRIT HEATER

    The Harvia Spirit sauna heater has an eye-catching and modern design that combines beauty and performance in one package. The soothing curved design of the Harvia Spirit electric heater gives a natural and serene look, which will help put your mind at ease. The Harvia Spirit holds 130 lbs of gorgeous rounded sauna stones that evoke calmness. This generous amount of stones allows bathers to create incredible steam (löyly) in the room. The heater is equipped with a remote WiFi control, which makes usage easy. The Harvia Spirit is truly the spirit of your sauna!

    Harvia is the world's leading sauna heater manufacturer, and Harvia heaters are considered the industry's gold standard. Harvia was established in Finland in 1950 and has built an international reputation for exceptional quality. With a Harvia heater, you know you are getting a reliable product you and your family can trust. All our Harvia sauna heaters are ETL-certified and are manufactured in Finland.

  • Flat Flooring Kit

    Flat Flooring Kit

    A duckboard flooring inset that is designed to sit on top of your concrete or tile floor. Pre-built and no assembly required. Just like our sauna, this flooring is made with the highest quality wood and designed to fit. Upgrade your sauna experience with a flat flooring kit.

    Add a Flat Flooring Kit for $299

  • Wooden Heater Guard (KIP Heaters Only)

    Wooden Heater Guard (KIP Heaters Only)

    Add a layer of protection in front of your KIP Heater with this heater fence. Easy assembly, ready to install in less than 5 minutes. The wood aesthetic will complement the rest of your sauna.

    Only compatible with Harvia KIP heaters.

    Add a Wooden Heater Guard for $79

  • Luxury Relaxation Pack

    Luxury Relaxation Pack

    Turn your sauna into the ultimate sanctuary! Our aromatherapy water fountain keeps the air in your sauna from drying out. Add a bit of Harvia's traditional Finnish sauna aromatherapy oils to your water fountain or your water bucket and let the scents of the Scandinavian forest take you away as you close your eyes. Our Finnish purpose-made sauna pillows will help you get comfortable as you relax in the scented and moist heat. Use the exfoliation brushes between your sauna rounds to keep your skin healthy and vibrant. Then, finally, when you are done your sauna take a relaxing shower with our Swedish traditional birch soap.

    Add a Luxury Relaxation Pack for $299

  • Harvia LED Light

    HARVIA LED LIGHT

    If you're looking for a way to enhance the ambiance of your sauna space, the Harvia LED Light Strip could be just what you need. This simple and easy-to-use solution is designed to provide warm and calming indirect lighting that perfectly complements the relaxing atmosphere of a sauna. You can even integrate it into your sauna benches for a modern and stylish touch. I hope this information helps you create the perfect sauna experience!

    Add Harvia LED Light for $315

  • OUTDOOR SHOWER

    OUTDOOR SHOWER

    Shower off after a sauna session or clean up before hopping in the hot tub. The shower’s classic cedar look is perfect for backyards and is the perfect pairing with any of our saunas or hot tubs. With an easy install process, why not treat yourself to a shower in the great outdoors.

    Add an Outdoor Shower for $499

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