The Sisu series brings timeless Finnish tradition and modern convenience together, offering a premium sauna experience you can install in a day.
The Finnleo Sisu Indoor Modular Sauna lets you park a genuine Finnish sweat lodge in the corner of your home gym, basement, or spare room—no framing hammer or remodel budget required.
The Finnleo Sisu Indoor Modular Sauna drops a true Finnish sweat lodge into any spare room—no remodel, no mess. Pre-built wall and ceiling panels in fine Nordic spruce (or upgraded hemlock or cedar) lock together in a day; benches, backrests, full-glass door, heater, rocks, and control are all in the same kit for a one-stop sauna.
Footprint and finish are yours to call—from a compact 4×4 solo box to a larger 7×8 for hosting guests—every build keeps that even, enveloping Finnish heat that melts sore muscles and quiets the mind. And if life takes you elsewhere, the screw-tight panel system breaks down just as neatly, letting you reinstall your wellness ritual at the next address.
The best part? The Sisu is customizable so you get to design it to fit your wants and needs.
Your time is valuable. That’s why the Sisu series is engineered with pre-fabricated wall panels that lock together smoothly. Forget the complexities of a traditional build.
With a few basic tools and a partner, you can have your sauna assembled and ready for its first heat in just a few hours. This means less time building and more time enjoying the deep, restorative heat.
All Sisu saunas are built from from select Nordic Spruce, Clear Western Red Cedar or Canadian Hemlock.
Nordic Spruce provides a bright, traditional Finnish aesthetic and a crisp, clean aroma.
Clear Cedar offers a rich, darker tone and its signature, beloved fragrance.
Clear Hemlock offers a soft red tone that stays consistent throughout. Less noticeable scent (compared to cedar).
All wood types are chosen for their beauty, resistance to warping, and ability to create the perfect sauna environment.
The SaunaLogic 2 Control gives you the ability to control the sauna from your phone. That means you can turn the sauna on from your living room, office, or anywhere else in the world—so your sauna will be ready when you are.
At the heart of every Sisu sauna is a high-quality Finnleo heater, the engine of your sauna experience. Available heater options are the Finnleo Himalaya Rock Tower and the Finnleo Designer SL2 (or Designer B w/ a built-in knob control).
It’s designed to heat the room quickly and efficiently, creating the enveloping wave of löyly (the Finnish word for the steam that rises from the rocks) that is the hallmark of a true sauna.
Proper rock placement ensures optimal air circulation for a consistently superior heat.
The Sisu design uses an interlocking system with screws for a remarkably strong and stable structure.
The base frame, wall panels, and top plate align precisely, ensuring a tight seal that keeps heat locked in for maximum efficiency.
This isn’t a flimsy kit; it’s essentially a permanent wellness fixture for your home (it can be taken down).
From the duckboard flooring to the pre-installed vent valve for proper air circulation, every detail is considered.
The electrical access board is cleverly designed to be removable, making wiring the heater straightforward for a licensed electrician.
It’s these thoughtful touches that make owning and using a Sisu sauna a seamless experience.
The Sisu Indoor Sauna Series is customizable from the wood type to the door, heater, layout and more.
You get your dream sauna in a package that can be installed in a day.
View all custom options below.
Invest with confidence knowing your Sisu sauna is backed by Finnleo’s comprehensive manufacturer warranty (5 years).
This covers the heater, controls, and cabin components, ensuring your peace of mind and guaranteeing years of reliable performance.
It’s a testament to the quality and craftsmanship behind every unit.
When you buy a modular sauna from an online-only retailer, you’re on your own.
When you purchase from us, you get a partner. Have a question during assembly? Call us at 612.505.9700.
Need a hand with installation? We offer professional installation services.
Want to see the materials firsthand? Visit our Minnesota showroom. We’re here to ensure your success.
The Finnleo Sisu series is available in a variety of sizes to fit your specific needs and space. Each model includes the sauna room, a genuine Finnleo heater, stones, benches, backrest(s), duckboard floor, and lighting.
Your sauna should be as unique as your reasons for wanting one. At Sauna Supply Company, we don’t just sell kits; we help you craft a personal sanctuary. Each of the following options allows you to tailor the look, feel, and performance of your Finnleo Sisu sauna to your exact preferences. As Minnesota’s sauna experts, we’re here to guide you through every choice.
More than just dimensions, the size of your sauna defines its purpose. Are you seeking a private space for solo meditation, or a social hub for family and friends? We’ll help you match the footprint to your lifestyle.
The heater is the engine of your sauna. Your choice determines the character of the heat and steam (löyly). We offer three exceptional Finnleo heaters to power your experience.
The wood defines the sauna’s ambiance—its look, its feel, and its scent. We use only premium, furniture-grade woods that are beautiful, durable, and create the perfect environment for relaxation.
Don’t overlook the details that deliver true comfort. A well-designed backrest transforms a bench from a simple seat into a comfortable lounger, providing essential ergonomic support for your mid-back and shoulders, allowing for longer, more relaxing sessions.
Each custom Sisu sauna comes with a standard 2-bar backrest. There are upgraded backrest versions available.
The right lighting is crucial for creating a truly relaxing atmosphere. Move beyond a simple bulb and create a soft, tranquil glow. We offer a range of modern lighting solutions, including LED light strips installed behind the backrests or underneath the benches to wash the walls with warm, indirect light—perfect for enhancing a state of deep relaxation.
LED strip lighting comes pre-installed behind your backrest. Can also be placed under bench.
Puck Lights go into the ceiling.
Globe Light mounts on the wall.
Your sauna door sets the tone for the entire room. We offer high-quality options to match your desired aesthetic and level of privacy.
Our standard sauna window comes in a single pane, tempered glass. They’re available in both clear and bronze tint. All windows are pre-hung in the panels.
Window Sizes:
Comfort and cleanliness start from the ground up. A duckboard walkway (in Finnish, ritilä) provides a beautiful, slip-resistant surface that feels warm and comfortable underfoot. It keeps your feet off the main floor of your home and is easily removable for cleaning.
A duckboard walkway comes standard with each sauna kit. Duckboards sit on the floor of the sauna and are walked on.
Duckboards usually are built in the primary wood species of the sauna.
An additional duckboard can be purchased for outside of the sauna (entryway, etc).
For a truly seamless and professional look, consider adding a skirt to the upper bench.
This panel cleanly closes the gap between the upper and lower benches, hiding the bench supports and creating the elegant, finished appearance of a high-end custom-built sauna.
View our Finnleo Sisu Sauna Gallery below. For additional sauna images visit our sauna gallery page here.
The Finnleo Sisu Sauna Series comes with the SaunaLogic2 Control (not including Designer B Heater)—a sleek, modern touchscreen that puts your sauna settings right at your fingertips. And the best part? It’s Wi-Fi enabled, so you can control your sauna from anywhere using your smartphone or tablet.
We believe in giving our customers options. Whether you’re a hands-on DIYer or you’d prefer to sit back and have the experts handle everything, we have a path for you.
The Finnleo Sisu is brilliantly designed for straightforward assembly. If you’re comfortable with basic tools and enjoy a weekend project, this is an incredibly rewarding option.
For the ultimate peace of mind, let our in-house team of professional sauna builders handle the entire installation. This isn’t a third-party service; it’s our own expert crew ensuring your investment is assembled to perfection.
Choosing our White-Glove Installation means you can relax, knowing the job is done right, done efficiently, and backed by our company’s reputation.
To ensure a smooth process, there are two things to prepare before installation:
We’re not just a sauna dealer—we’re sauna users, builders, and enthusiasts with Finnish roots and Minnesota values.
With 45+ five-star Google reviews and a showroom where you can experience authentic Finnish sauna firsthand, we’re proud to be one of Minnesota’s most trusted sauna builders—transforming homes one beautiful sauna at a time.
Choosing a Finnleo Sisu sauna is about more than just buying a product; it’s about embracing a lifestyle of wellness, tranquility, and authentic tradition. It’s an investment that pays dividends in your health, your peace of mind, and the value of your home.
You don’t have to navigate this journey alone. As Minnesota’s sauna experts, we’re here to guide you every step of the way—from choosing the perfect model to ensuring a flawless installation.
Ready to experience the deep, restorative power of a true Finnish sauna?
Contact us today for a personalized quote. Let’s build your home sanctuary together.
Each model requires a dedicated 240V circuit. The specific amperage depends on the heater size (e.g., a 4.5 kW heater typically needs a 30-amp circuit). All electrical work must be performed by a licensed electrician to ensure safety and code compliance. We can provide the specific electrical requirements for the model you choose.
Yes. The modular, panel-based construction makes it possible to carry the components into almost any space. The key is ensuring the floor is waterproof and structurally sound enough to handle the weight. A level tile floor is an excellent surface.
Nordic Spruce is a traditional Finnish sauna wood known for its bright, light-colored appearance and crisp, clean scent. It’s durable and resists warping. Western Red Cedar has a richer, reddish-brown hue and the classic, aromatic scent many people associate with saunas. It’s naturally resistant to moisture and bacteria. The choice is largely about aesthetics and aroma preference.
For anyone with basic tool proficiency, assembly is straightforward. The instructions are clear, and the panels are numbered to correspond with the base frame. We recommend having a partner to help lift and position the panels. Most customers complete the assembly in a day. If you’re in Minnesota and prefer a hands-off approach, our expert team can install it for you.
Finnleo offers a robust manufacturer’s warranty. Typically, this includes a limited lifetime warranty on the sauna cabin and 5 years on the heater and controls for residential use. We can provide the full warranty details for your specific model.
While the unit is self-contained, we recommend leaving at least a couple of inches of clearance around the exterior walls for air circulation. If you have a low ceiling, some models require special installation steps for the ceiling panels before the front wall is installed, so be sure to measure your total ceiling height accurately.
If you have other questions or need specific information, don’t hesitate to ask. We have years of sauna experience and will help you with what you need.
Let’s Build Your Dream Sauna.
500 Cokato St W Suite #4,
Cokato, Minnesota 55321
Monday – Friday: 8AM-5PM
After hours appointments available, please call 612.505.9700 to schedule.
A team member will reach out to you after you submit the form!
After you submit a form, a team member will reach out to you about your custom indoor sauna project!
Our response times are quick. A team member will reach out to you after you submit the form!
