Quality pre-fab saunas meets simple installation and value—bring authentic Finnish sauna bathing home without the complexity or wait.
The Therma series delivers authentic Nordic heat in a package you can install with a friend in less than a day. These aren’t cheap plywood boxes—each sauna is handcrafted in Estonia using solid 1.5-inch Nordic White Spruce, the same wood Finns have trusted for generations.
The Therma 44 plugs into a standard 120V outlet (easiest entry point), while the larger 240V models still go up in a Saturday morning with a friend.
What sets these apart is how they balance Finnish authenticity with smart modern touches: floor-to-ceiling glass that opens up small spaces, ergonomic Aspen benches that support your back properly, and integrated LED lighting you control from your phone—all pre-assembled so you’re not spending weeks measuring and second-guessing.
Let’s break down what makes these saunas worth the investment—the stuff that actually improves your life, not just the spec sheet.
Two people can assemble any Therma model in 4-6 hours using basic tools. The panels arrive pre-assembled, the benches are ready to install. You’ll have some assembly—it is more comlex than a Hallmark Series, but still straightforward.
From the compact 4×4 Therma 44 (2 people) to the spacious 7×8 Therma 78 (6 people), there’s a model for basement corners, heated garage spaces, spare bedrooms, or dedicated sauna rooms.
The 240V models include Wi-Fi enabled controls so you can pre-heat from your phone on the drive home. But the interface isn’t buried in a confusing app—it’s intuitive enough that you’ll set your temperature and forget about the technology.
Integrated LED strips behind the backrests provide ambient lighting that enhances relaxation without being harsh. The exterior perimeter lighting creates a welcoming glow. Both are dimmable via Wi-Fi app and remote, so you control the atmosphere.
The included vinyl flooring system is non-VOC and eco-safe, meeting strict European standards. No off-gassing, no chemical smells, just clean materials that perform well in high-heat environments. The spruce and aspen woods are naturally antimicrobial and handle humidity beautifully.
Unlike ordering a kit online and hoping for the best, you’re working with Minnesotans who grew up with saunas and understand cold-climate installations. We answer your questions before purchase, guide you through installation if needed, and service what we sell.
The Therma series offers four distinct models ranging from 2-person compact units to spacious 6-person family saunas. Each model shares the same high-quality construction—solid Nordic White Spruce walls, Grade-A Aspen benches, floor-to-ceiling glass fronts, and integrated LED lighting—but they vary in footprint, capacity, and electrical requirements to match different spaces and needs.
This is the model that surprises people. A genuine Finnish sauna that plugs into a standard wall outlet? The Therma 44 delivers on that promise with a powerful 1.9kW Finnish-made heater that reaches 170°F in about 45-50 minutes. Perfect for individuals or couples who want authentic heat therapy without electrical work.
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This model hits the sweet spot for many homeowners—roomy enough for 2-3 people, compact enough to fit in a basement corner or spare bedroom, and powerful enough to reach proper Finnish temperatures. The 4′ x 6′ footprint is surprisingly spacious inside thanks to the glass front design.
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The Therma 57 is where you start seeing genuine family sauna capability—5 people can fit and 3-4 people have room to really spread out. This is the model lake cabin owners and families gravitate toward. The 5′ x 7′ interior provides enough bench space for everyone.
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This is as large as the Therma series gets, and it’s impressively spacious—the 7′ x 8′ interior provides commercial-grade room for up to 6 adults comfortably. The price-to-space ratio makes this the best value if you have the floor space and want a sauna that accommodates larger groups or provides luxury room for smaller gatherings.
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The Therma 46, 57, and 78 are compatible with Wi-Fi enabled heater controls that let you pre-heat from your phone. This isn’t about adding unnecessary technology—it’s about coming home to a ready sauna instead of waiting 30 minutes after a long day. The Finsauna PH-series heaters (available for all three models) include intuitive controls you access via smartphone app or wireless remote. Set your temperature, schedule pre-heat times, or adjust settings mid-session without leaving the bench.
The system is straightforward: download the app, connect to your home Wi-Fi, and you’re controlling temperature from anywhere. Want your sauna at 180°F when you finish your workout? Start it remotely 30 minutes before. The controls also let you dim the integrated LED lighting to create the exact mood you want—bright for socializing, low for relaxation.
For those who prefer traditional operation, the standard H-series heaters include reliable wall-mounted controls. No apps, no Wi-Fi—just temperature dials and timers that work every time. Both systems are equally reliable; it’s purely preference.
Wall System The core structure uses solid Nordic White Spruce harvested in Northern Europe and milled into 1.5-inch thick tongue-and-groove panels. This isn’t plywood or composite material—it’s solid wood that expands and contracts naturally with humidity changes, creating a tighter seal over time. The vertical STP (shiplap tongue and plank) paneling on the interior walls provides both structural strength and the classic sauna aesthetic. Spruce is naturally rot-resistant and handles 180-200°F temperatures without warping or splitting when properly installed.
The two-tone Thermo-Aspen accents undergo thermal modification—a process that heats the wood to 400°F in controlled conditions, darkening it naturally and improving its dimensional stability. These accents aren’t just decorative; Thermo-Aspen resists moisture damage better than untreated wood and adds tonal variation that prevents the “all one color” look many modular saunas suffer from.
Bench System The benches use Grade-A Aspen, which means knotless boards selected for consistency and smoothness. Aspen is the traditional Finnish bench wood because it stays cool to the touch even at high temperatures (those 1.1-inch thick furniture-grade boards don’t conduct heat like thinner materials). The ergonomic design includes arched backrests that support your lumbar region during 15-20 minute sessions—something you notice after your third or fourth sauna when other benches would have you shifting around for comfort.
Glass & Door System The floor-to-ceiling tempered glass door is 8mm thick (5/16″), meeting both safety standards and aesthetic goals. Tempered glass can handle the thermal stress of sauna use—rapid temperature changes from 70°F to 180°F won’t crack it. The premium turned-wood handles feel substantial and stay cool enough to grip even mid-session. Door swing is reversible during installation, so you’re not locked into one configuration based on your room layout.
Flooring System The included vinyl flooring system is specifically rated for high-heat environments and carries non-VOC certification, meaning it won’t off-gas chemicals at sauna temperatures. Many DIY builders overlook flooring and end up with warped wood or tiles that crack from thermal expansion—this system handles it properly from day one.
We believe in giving our customers options. Whether you’re a hands-on DIYer or you’d prefer to sit back and have us handle everything, we have a path for you.
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.
If you’re comfortable with tools and enjoy a project, this is an incredibly rewarding option.
To ensure a smooth process, there are two things to prepare before installation:
Your sauna must be placed on a solid, level, and waterproof surface. Concrete, tile, or vinyl are excellent choices. A sauna should never be installed on carpeting.
Your sauna heater requires a dedicated 240V circuit installed by a licensed electrician, as specified in the heater manual. We will provide the manual beforehand of your chosen model so your electrician can prepare the connection in advance.
We build saunas the way they should be built—with Finnish expertise and Minnesota craftsmanship. Our team doesn’t just sell saunas; we use them daily, understand their construction inside and out, and have helped over 250 families create their perfect sauna experience—whether through a fully custom done-for-you sauna, DIY sauna kit or a modular system.
Every sauna we build reflects decades of combined experience in woodworking, construction, and traditional sauna design. Our builders handle projects from compact home saunas to luxury custom installations, ensuring precise construction and authentic performance every time.
Before you invest, visit our showroom to experience authentic sauna heat. Feel the difference quality materials and proper construction make. Talk with specialists who understand löyly, ventilation, and the details that separate a great sauna from an expensive disappointment.
Our 50+ five-star reviews on Google come from customers who’ve experienced the difference professional guidance makes—from initial design through your first sauna session.
From first-time buyers navigating their options to Finnish families honoring tradition, our customers tell it best. Read what verified reviewers say about working with us. Read 50+ 5 star customer reviews on Google here.
Getting started is simple: Fill out the form below with information on what you’re looking for and any questions, or call us at 612-505-9700.
If you can assemble IKEA furniture and have helped a friend move heavy furniture, you can install a Therma sauna. The panels are pre-assembled—you’re positioning them, securing them together, and installing the bench system. The most challenging part is getting the panels level and square (use shims and a level, take your time). The instructions are clear, and we’re available by phone if you hit a confusing step.
Common mistakes we see: Rushing the leveling step (leads to gaps later), over-tightening screws in wood (strip the threads), or placing the sauna before confirming electrical is ready. Avoid those, and you’ll be fine.
All models but the smallest Therma 44 require 240V power.
Each Therma sauna comes with an industry standard 2-year warranty.
Yes—that’s one advantage of modular construction. The Therma series disassembles in a few hours and can be moved to a new home if you’re careful about labeling panels during disassembly. You’ll need 2-3 people, proper moving equipment, and ideally a trailer or truck with enough space, but it’s completely feasible. Some people disassemble their Therma saunas when moving and reassemble them at the new property over a weekend.
This is valuable for homeowners who might relocate in 3-5 years but still want sauna benefits now. Custom-built saunas are permanent installations that add to home value but don’t move with you. Modular saunas like Therma split the difference—they increase your current home’s appeal (sauna-equipped homes sell faster and often at premium prices) but relocate if you need them to.
Realistically: Most people who install Therma saunas and then move opt to leave them and negotiate a higher sale price rather than moving them. But it’s nice to have the option if your new home has perfect space and your old one doesn’t have a buyer who values saunas.
Yes—that’s one advantage of modular construction. The Therma series disassembles in a few hours and can be moved to a new home if you’re careful about labeling panels during disassembly. You’ll need 2-3 people, proper moving equipment, and ideally a trailer or truck with enough space, but it’s completely feasible. Some people disassemble their Therma saunas when moving and reassemble them at the new property over a weekend.
This is valuable for homeowners who might relocate in 3-5 years but still want sauna benefits now. Custom-built saunas are permanent installations that add to home value but don’t move with you. Modular saunas like Therma split the difference—they increase your current home’s appeal (sauna-equipped homes sell faster and often at premium prices) but relocate if you need them to.
Realistically: Most people who install Therma saunas and then move opt to leave them and negotiate a higher sale price rather than moving them. But it’s nice to have the option if your new home has perfect space and your old one doesn’t have a buyer who values saunas.
Give us a call at 612.505.9700 or use our contact form to get additional information.
Experience the difference quality makes at our Cokato sauna showroom, where you can see, touch, and even try our saunas before deciding.
Explore custom indoor, custom outdoor, and modular models to compare construction, feel the authentic heat, and experience different wood types—whether it’s the aromatic Western Red Cedar, clear Canadian Hemlock, traditional Nordic Spruce, or more.
Our sauna specialists are here to answer questions, explain the differences between modular and custom builds, and help you visualize how a sauna fits into your space and lifestyle. Many customers tell us their showroom visit completely changed their understanding of what they wanted—there’s no substitute for seeing and sitting in a sauna before you buy.
Visit us at 500 Cokato St W, Cokato, Minnesota. Our standard business hours are 8AM-5PM CST. View our Google Business Profile for updated and holiday hours, or call 612.505.9700 to schedule an appointment.
Submit the form to get a quote, ask questions, or receive expert guidance from one of our sauna specialists.
