Sauna Company USA · Wood-Burning Stove
Harvia 20 Duo
Harvia 20 Duo. A wood-fired sauna stove for authentic, long-lasting radiant heat and rich löyly. Suited for rooms roughly 283–706 cu ft.
2-Year Warranty
Harvia 20 Duo Stove-Fireplace
Factory photos — Harvia 20 Duo Stove-Fireplace
Bundle Your Stoveadd the essentials
Recommended add-ons chimney, stones & safety
$3,190
MAP PricingSauna Company USA is an authorized dealer bound by Minimum Advertised Price (MAP) policy. The price shown is the lowest we are permitted to sell this product for — not a markup, not a negotiating floor. Full transparency, always.
6 in stock and ready to ship
No sales tax on orders shipped outside New Jersey
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In stock · Ships via parceliShipping to Alaska, Hawaii, or Puerto Rico?
We ship there — but you must call or text (877) 417-9006 first and we’ll send you a price and a fair, quoted freight amount.Online checkout covers the Lower 48 and Canada; Alaska, Hawaii & Puerto Rico are quote-only and blocked from ordering on their own.
Overview
Harvia 20 Duo — a wood-burning sauna stove by Harvia. Suited for rooms roughly 283–706 cu ft.
Have the best of both worlds with the innovative Harvia Pro 20 Duo, a unique solution to heating two rooms with one stove. Enjoy the sauna room with great steam and then move to the next room to relax in the glow of a warm fireplace.
Required sauna stones 88 lbs (2 boxes) sold separately.
Key Features
Harvia 20 Duo
- Wood-burning sauna stove — no electricity required
- Gentle, long-lasting radiant heat and rich löyly steam
- Heavy-duty steel construction
- Includes flue collar; requires a code-compliant chimney and clearance to combustibles
Sauna stones are required and sold separately unless noted. Professional installation is recommended.
Harvia 20 Duo Stove-Fireplace
Sale price$3,190.00 USD
Regular price (/)
MAP PricingSauna Company USA is an authorized dealer bound by Minimum Advertised Price (MAP) policy. The price shown is simply the lowest price we are able to advertise this product for — call us and we can often get you a better deal.
Every Detail
Specifications & Details
Specifications
Brand: Harvia
Heat Source: Wood-Burning
Construction: Steel
Recommended Room: 283–706 cu ft
What's Included
- Harvia 20 Duo wood-burning sauna stove
- Flue collar
- Installation manual
Not included: sauna stones, chimney/flue pipe (sold separately).
Sizing & Chimney
Match the stove to your room volume and follow the manufacturer’s clearance-to-combustible distances. A code-compliant insulated chimney is required.
Shipping & Warranty
Shipping: Freight, curbside delivery.
Warranty: Manufacturer limited warranty against defects.
Title
Questions about sizing? Use the heater sizing guide or contact us directly.
Returns & Refunds
30-Day Return Policy
We accept returns on this product within 30 days of delivery. To initiate a return, email info@saunacompanyusa.com with your order number.
Shipping Damage — If the return is required due to damage, include photos of the damage and note whether shipping damage was recorded upon signing for delivery. Shipping costs are fully covered for carrier-caused damage.
No-Damage Returns — No restocking fee is charged. You will be issued a credit for the full amount paid, less any required new boxing fees of approximately $20–$50 depending on the product.
Damaged Product — If the product is damaged, you will be notified to file a claim with your shipper. We assist throughout the process.
View our full Return Policy for complete details.
Resources
Documents & Manuals
Installation & User Manual
Product manuals available on request — contact us.
Returns & Refunds
Product manuals available on request — contact us.
About Harvia
Real fire. Real sauna.
The Harvia 20 Duo brings the timeless ritual of a wood-fired sauna — the crackle of the fire, the aroma of birch, and a deep, enveloping heat that electric simply can’t replicate. Built by Harvia for a lifetime of use.
Who the Harvia 20 Duo Stove-Fireplace Is For
The Harvia 20 Duo Stove-Fireplace is a wood-burning sauna heater from Harvia, built to bring a traditional sauna room up to temperature and hold it there. It is a fit for homeowners pairing a heater with a compatible traditional sauna who want the ambiance of a live fire. Correct sizing to your room volume is the key to performance.
Every Detail
Harvia 20 Duo Stove-Fireplace Specifications and Sizing
Specifications and sizing guidance for the Harvia 20 Duo Stove-Fireplace.
Output and Room Sizing
Match the heater output to your sauna's cubic volume; glass and uninsulated surfaces increase the output needed.
Heat Source and Stones
This is a wood-burning heater that uses a firebox and sauna stones to generate heat and steam. Sauna stones may be sold separately depending on the model.
Installation and Flue
Requires proper clearances and a code-compliant flue/chimney; follow the manufacturer manual and local codes.
Compatibility
Designed for traditional (non-infrared) saunas. Confirm the Harvia 20 Duo Stove-Fireplace suits your sauna's size and build — our team can verify compatibility.
Warranty and Support
Backed by the Harvia manufacturer warranty. We help with sizing, controls, and post-sale support.
About Harvia
Harvia builds sauna heaters for traditional sauna rooms, and the Harvia 20 Duo Stove-Fireplace reflects that engineering. Every heater we ship is a genuine Harvia product backed by the manufacturer warranty, with sizing help and support from our team before and after purchase.
Harvia 20 Duo Stove-Fireplace - Frequently Asked Questions
What size sauna does the Harvia 20 Duo Stove-Fireplace heat?
Match the heater output to your sauna's cubic volume; glass and uninsulated surfaces increase the output needed.
Does the Harvia 20 Duo Stove-Fireplace come with stones?
Sauna stones are required for operation and may be included or sold separately depending on the model — check the listing or contact us to confirm.
What electrical or installation is required?
This wood-burning heater needs code-compliant clearances and a flue; follow the manual and local codes.
Is it compatible with my sauna?
The Harvia 20 Duo Stove-Fireplace is made for traditional saunas. Share your sauna's size and model and we will confirm it is a correct match.
What warranty comes with it?
The Harvia 20 Duo Stove-Fireplace is covered by the Harvia manufacturer warranty against defects in materials and workmanship for residential use.
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Marcus Lindqvist
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Travis Holloway
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Danielle Fournier
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Stunning centerpiece for the backyard
This sauna has become the social hub of our home. Friends come over just to use it. The craftsmanship is top notch, the glass front gives it a modern look, and the interior bench seating is more spacious than the photos…
Eleanor Bridgewater
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I bought this primarily for muscle recovery and it has exceeded expectations. After a hard training week, twenty minutes in here loosens everything up. The wood is fragrant, the build feels premium, and the bench layout…
Priya Raghunathan
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DIY kit that's genuinely doable
Was nervous about assembling something this size but the panels are well labeled and everything lined up. Took a full weekend with my father-in-law helping. The result is rock solid. Heats up quick and the cedar…
Garrett Wozniak
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Reginald Okafor
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Lauren O'Connell
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The freight company dropped it curbside on a pallet and it took my brother and me the better part of a Saturday to assemble. The instructions were clear and the staves are pre-cut so everything lined up well. Only…
Marcus Delaney
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Did my research and have no regrets
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Michael Page
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Well put together kit
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Justin Marlowe
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Mark Petersen
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Could not be happier!
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Craig Hodges
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Stellar customer service
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Joseph Eves
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Daniel Reyes
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Adam Fitzhugh
★★★★★
Great product and customer service
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Marcus Sawyer
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Great service and great product
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Fred Humphrey
★★★★★
Stylish and it performs
Loving it. While the setup had its moments, the end result looks great on our deck and we're able to get it quite hot even with it being 20 degrees outside. The glass front and the clean cube lines are exactly the…
Rebecca Stahl
★★★★★
Great product, rough delivery logistics
The sauna is built and the product is genuinely sound and enjoyable. The process from ordering to receiving was where the trouble was. I live on an island with a short car ferry, and the curbside LTL freight situation…
Tim Gerhard
★★★★★
Great unit but bring patience for the build
The team was outstanding in helping me pick the perfect unit and heater, and the purchasing and freight delivery process was seamless. My husband built this himself and there were some issues with the instructions,…
Jenny Woodburn
★★★★★
Our backyard wellness retreat
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Krista Lindholm
★★★★★
Great tub, heats up fast
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James Bracken
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Backyard centerpiece
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Marisol Quintero
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Wonderful product and service
If you're looking for a quality traditional sauna I highly recommend this Cube. We wanted something clean and traditional without chemicals, and the Cube was exactly it. We don't have a large backyard so fit…
Kathy Brennan
★★★★★
We are VERY happy with our Cube
We are very happy with our Cube. The team helped us decide which configuration would be best for our needs and they were spot on. They were extremely helpful throughout the entire process from purchase through the DIY…
Teresa Vandermolen
★★★★★
Absolutely stunning cube
Just got the CL4G Cube and couldn't be happier. Customer service was supreme — very knowledgeable, and the freight arrived pretty quickly. After getting the kit assembled it feels solid and built to last. It heats…
Marcus Whitfield
★★★★★
Our winter ritual now
We bought the CL4G ahead of winter and it has become our nightly ritual. From 50°F it climbs to around 180°F in under 25 minutes with the upgraded heater, and the cabin holds heat well even on snowy nights. The clear…
Diane Kowalski
★★★★★
The best service you can ever imagine
The best service you can ever imagine. My electrician wasn't the best, and the support team was patient, explained every step in detail, and even sent replacement parts to make sure everything was wired and working…
Steven Boudreau
★★★★★
Excellent experience
Elegant looking sauna and a great addition to our backyard and lifestyle. The kit went together over a weekend, the glass door is beautiful, and the benches are wide enough to lie down on. Thanks to the team for their…
John Petrakis
★★★★★
Solid kit, worth it
SaunaLife Cube CL4G — great kit, panels were well packaged on the pallet and everything was labeled. Heats fast and feels premium.
Greg Tanaka
★★★★★
Happy new sauna owner!
We love our new Cube. The LTL freight driver was great and even helped me move the pallet up to my carport so it wasn't on the street overnight. The construction feels solid and it smells delightful — buy the…
Richie Alvarado
★★★★★
Absolutely love it (instructions aside)
We absolutely love the quality of our sauna. The directions need some improvement — not as clear as they should be — so you have to get creative, but overall the build went fairly smooth. Quality has been excellent: it…
Chloe Bergstrom
★★★★★
Exceptional support and faster-than-expected delivery
If you're on the fence about where to buy your sauna, let this be your sign to go with this team. I found them through a forum recommendation and they lived up to the hype. The LTL freight side was perfect; the…
Jason Delacroix
★★★★★
Used it every single day since assembly
We've used the sauna every day since we assembled it. The DIY build takes a solid 10-15 hours, and that was even with professional help, so plan for a full weekend. That said, the quality is top-notch and the…
Japhy Madsen
★★★★★
Worth every dollar for family recovery time
We bought this as a recovery space after workouts and it has exceeded expectations. The DIY kit assembly was a fun father-daughter project over a weekend, and the instructions were clear enough that we didn't need…
Priya B. Raghunathan
★★★★★
Quality product designed to last
Very helpful and informative sales team that answered all my heater questions before I bought. Quality product designed to last, and the setup instructions were easy to follow. The freight driver dropped the crate…
Evan Castellano
★★★★★
Beautiful sauna, door instructions could be clearer
The overall quality and craftsmanship of this sauna is amazing. The thick cedar panels and the glass front feel premium. The only snag was the door installation instructions, which need a little work and slowed us down…
Jennifer Lawson-Steele
★★★★★
Great buying experience!
Great buying experience! More help and better pricing than the local wholesaler in my area. I had a good idea of what I wanted, but Eric was very helpful trimming it out and pairing it with a HUUM Drop heater. Still…
Scott Cockrell
★★★★★
Beautiful sauna, glad we went for it
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Marcus A. Whitfield
★★★★★
They fixed a shipping issue right away
There was a minor shipping issue with one of the crates and the team took care of it right away, no hassle at all. Replacement parts went out immediately and customer service kept me updated the whole time. Great…
Diane Petersohn
★★★★★
Great sauna, plan for the freight delivery
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Theodore Brunhauser
★★★★★
Complete Satisfaction
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Mark Miller
★★★★★
Everything I hoped for
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Andrew Castellano
★★★★★
Perfect fit for our spare bedroom
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Soo-Jin Park
★★★★★
Great for recovery and pain relief
Bought this on a physical therapist's recommendation for chronic back tension. The near and far infrared combination has genuinely helped. It heats fast, the controls are intuitive, and the glass front makes the…
Tobias Reinhardt
★★★★★
Gets to 170°F every single day
We could not be happier with the FD-4 hybrid. We were so worried we'd buy the wrong one, and now we know we chose right. We wanted a sauna that gets really hot and this one does the job on the traditional side. The…
Lawrence Cook
★★★★★
Best sauna we've ever owned
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Anthony Caruso
★★★★★
The Thermo-Aspen barrel is a beauty
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Roland Akselsen
★★★★★
Beautiful Canadian cedar barrel
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Patrick Donnelly
★★★★★
The E8G barrel is fantastic
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Cory Whitman
★★★★★
Built like a tank
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Greg Halloran
★★★★★
Perfect for recovery after long runs
I bought the FD-1 mainly for muscle recovery during marathon training and it has earned its spot. Twenty minutes after a hard long run and the soreness the next day is noticeably less. The infrared warms my body rather…
Priya Raman
★★★★★
Stunning Canadian cedar build
The Serenity barrel is everything I hoped for. The Eastern white cedar smells incredible and the craftsmanship from Dundalk is obvious in every joint. We seat four comfortably with room to lie down on the upper bench.…
Nathaniel Forsythe
★★★★★
The Elation is a stunning piece of craftsmanship
This Dundalk barrel sauna is built like a tank. The Canadian cedar is gorgeous and the panoramic back window makes you feel like you're sitting in the forest. It arrived by freight on two pallets, well crated, and…
Wyatt Lambertson
★★★★★
The GL6 is a statement piece
The GL6's full glass front is the first thing everyone comments on. It makes the cabin feel huge and lets us watch the snow fall while we sweat. The DIY kit arrived on a curbside freight pallet, well wrapped, and…
Brandon Ferreira
★★★★★
Worth every penny for recovery
I do cold plunges six days a week now. The cedar tub looks beautiful next to our sauna and the two together are the perfect contrast therapy routine. Assembly was minimal compared to a sauna kit, mostly leveling the…
Priya Natarajan
★★★★★
Family loves it
We use the Harmony almost every night as a family. The barrel shape circulates the heat so well — the upper bench gets hot fast while the floor stays comfortable for the kids. The cedar smell is unreal and after a…
Rebecca Lindqvist
★★★★★
Cold plunge with the chiller is a complete setup
The S2BC package came with the chiller-heater combo so it was ready to go almost out of the box. The barrel tub is gorgeous solid wood and the water clarity stays excellent with the included filtration. I keep it at 45…
Colton Reyes
★★★★★
Glad we went full-spectrum
After comparing a few brands we picked the FD-1 for the full-spectrum emitters and I'm glad we did. The near, mid, and far infrared together give a much more thorough sweat than my gym's old far-only unit.…
Christopher Jones
★★★★★
Built like a tank
The Canadian Timber Polar Plunge is seriously solid. The cedar staves are thick and the stainless liner is flawless, no leaks after three months of daily use. It arrived by LTL freight strapped to a pallet and the…
Bradley Hoffman
★★★★★
The G6 is a showstopper
This is the flagship of the lineup and it shows. The panoramic glass front turns our backyard into a retreat, and the Nordic spruce is flawless. Curbside LTL freight delivery was smooth and every panel in the DIY kit…
Brian Castellano
★★★★★
Spacious and stunning with the panoramic glass
The CL12GCP is a serious sauna. The full panoramic glass front and porch make it feel like a proper retreat in the backyard, and there is room for the whole family plus friends. DIY kit assembly took two of us a long…
Nathaniel Orenstein
★★★★★
Best backyard decision we made
After researching for months we went with the Serenity and have zero regrets. The barrel shape heats so evenly and the glass door looks premium. We use it almost every night in winter, the cedar holds heat beautifully.…
Bethany Crowe
★★★★★
Absolutely love it (instructions aside)
We absolutely love the quality of our sauna. The directions need some improvement — not as clear as they should be — so you have to get creative, but overall the build went fairly smooth. Quality has been excellent: it…
Chloe Bergstrom
★★★★★
Exceptional support and faster-than-expected delivery
If you're on the fence about where to buy your sauna, let this be your sign to go with this team. I found them through a forum recommendation and they lived up to the hype. The LTL freight side was perfect; the…
Jason Delacroix
★★★★★
Used it every single day since assembly
We've used the sauna every day since we assembled it. The DIY build takes a solid 10-15 hours, and that was even with professional help, so plan for a full weekend. That said, the quality is top-notch and the…
Japhy Madsen
★★★★★
Worth every dollar for family recovery time
We bought this as a recovery space after workouts and it has exceeded expectations. The DIY kit assembly was a fun father-daughter project over a weekend, and the instructions were clear enough that we didn't need…
Priya B. Raghunathan
★★★★★
Quality product designed to last
Very helpful and informative sales team that answered all my heater questions before I bought. Quality product designed to last, and the setup instructions were easy to follow. The freight driver dropped the crate…
Evan Castellano
★★★★★
Beautiful sauna, door instructions could be clearer
The overall quality and craftsmanship of this sauna is amazing. The thick cedar panels and the glass front feel premium. The only snag was the door installation instructions, which need a little work and slowed us down…
Jennifer Lawson-Steele
★★★★★
Great buying experience!
Great buying experience! More help and better pricing than the local wholesaler in my area. I had a good idea of what I wanted, but Eric was very helpful trimming it out and pairing it with a HUUM Drop heater. Still…
Scott Cockrell
★★★★★
Beautiful sauna, glad we went for it
Beautiful sauna and incredibly well made. The cedar smells amazing the moment you open the door and the benches are wide and comfortable for two adults. Build took us a weekend but the panels lined up nicely.…
Marcus A. Whitfield
★★★★★
They fixed a shipping issue right away
There was a minor shipping issue with one of the crates and the team took care of it right away, no hassle at all. Replacement parts went out immediately and customer service kept me updated the whole time. Great…
Diane Petersohn
★★★★★
Great sauna, plan for the freight delivery
Really happy with the CL3G overall. The cedar quality, the glass front, and the bench depth are all excellent, and it heats up faster than I expected in winter. My only note is to plan ahead for the curbside LTL freight…
Theodore Brunhauser
★★★★★
Complete Satisfaction
We received our Finnmark FD-1 ahead of schedule, expertly packed on the freight pallet, and assembly took less than an hour even working alone. The curbside LTL drop-off was smooth once I cleared a path to the garage.…
Mark Miller
★★★★★
Everything I hoped for
Before this I had an order placed with another big-name infrared brand and after repeated shipping delays I canceled. I did more research and landed on the FD-3, which beats my original pick on style, materials and…
Andrew Castellano
★★★★★
Perfect fit for our spare bedroom
We measured carefully and the FD-3 fit perfectly in our converted spare room. Assembly was two of us and an afternoon - the panels click together logically. The infrared warms you deep without that heavy sauna humidity,…
Soo-Jin Park
★★★★★
Great for recovery and pain relief
Bought this on a physical therapist's recommendation for chronic back tension. The near and far infrared combination has genuinely helped. It heats fast, the controls are intuitive, and the glass front makes the…
Tobias Reinhardt
★★★★★
Gets to 170°F every single day
We could not be happier with the FD-4 hybrid. We were so worried we'd buy the wrong one, and now we know we chose right. We wanted a sauna that gets really hot and this one does the job on the traditional side. The…
Lawrence Cook
★★★★★
Best sauna we've ever owned
This Finnmark is absolutely incredible. We had two infrared saunas over the past 20 years and the heat from this Trinity combo is noticeably better and heats up faster. Photo is from our finished install in the basement…
Anthony Caruso
★★★★★
The Thermo-Aspen barrel is a beauty
This combination barrel sauna gives us both infrared and traditional steam, which was exactly what my wife and I wanted - we couldn't agree on one or the other, so this settled it. The thermo-treated aspen is…
Roland Akselsen
★★★★★
Beautiful Canadian cedar barrel
The Harmony is a showpiece. The Western red cedar staves arrived on an LTL freight pallet curbside and were beautifully milled — not a single damaged board. Assembly with two people took the better part of a Saturday,…
Patrick Donnelly
★★★★★
The E8G barrel is fantastic
Our E8G has been everything we hoped. The barrel shape heats so evenly — the top bench is roasting while the floor stays comfortable. The Nordic spruce staves arrived curbside on a freight pallet, well protected, and…
Cory Whitman
★★★★★
Built like a tank
The Baltic Plunge arrived on an LTL freight truck and the crate was heavier than I expected, so have help ready for curbside. The Canadian cedar staves are thick and the craftsmanship is obvious the moment you uncrate…
Greg Halloran
★★★★★
Perfect for recovery after long runs
I bought the FD-1 mainly for muscle recovery during marathon training and it has earned its spot. Twenty minutes after a hard long run and the soreness the next day is noticeably less. The infrared warms my body rather…
Priya Raman
★★★★★
Stunning Canadian cedar build
The Serenity barrel is everything I hoped for. The Eastern white cedar smells incredible and the craftsmanship from Dundalk is obvious in every joint. We seat four comfortably with room to lie down on the upper bench.…
Nathaniel Forsythe
★★★★★
The Elation is a stunning piece of craftsmanship
This Dundalk barrel sauna is built like a tank. The Canadian cedar is gorgeous and the panoramic back window makes you feel like you're sitting in the forest. It arrived by freight on two pallets, well crated, and…
Wyatt Lambertson
★★★★★
The GL6 is a statement piece
The GL6's full glass front is the first thing everyone comments on. It makes the cabin feel huge and lets us watch the snow fall while we sweat. The DIY kit arrived on a curbside freight pallet, well wrapped, and…
Brandon Ferreira
★★★★★
Worth every penny for recovery
I do cold plunges six days a week now. The cedar tub looks beautiful next to our sauna and the two together are the perfect contrast therapy routine. Assembly was minimal compared to a sauna kit, mostly leveling the…
Priya Natarajan
★★★★★
Family loves it
We use the Harmony almost every night as a family. The barrel shape circulates the heat so well — the upper bench gets hot fast while the floor stays comfortable for the kids. The cedar smell is unreal and after a…
Rebecca Lindqvist
★★★★★
Cold plunge with the chiller is a complete setup
The S2BC package came with the chiller-heater combo so it was ready to go almost out of the box. The barrel tub is gorgeous solid wood and the water clarity stays excellent with the included filtration. I keep it at 45…
Colton Reyes
★★★★★
Glad we went full-spectrum
After comparing a few brands we picked the FD-1 for the full-spectrum emitters and I'm glad we did. The near, mid, and far infrared together give a much more thorough sweat than my gym's old far-only unit.…
Christopher Jones
★★★★★
Built like a tank
The Canadian Timber Polar Plunge is seriously solid. The cedar staves are thick and the stainless liner is flawless, no leaks after three months of daily use. It arrived by LTL freight strapped to a pallet and the…
Bradley Hoffman
★★★★★
The G6 is a showstopper
This is the flagship of the lineup and it shows. The panoramic glass front turns our backyard into a retreat, and the Nordic spruce is flawless. Curbside LTL freight delivery was smooth and every panel in the DIY kit…
Brian Castellano
★★★★★
Spacious and stunning with the panoramic glass
The CL12GCP is a serious sauna. The full panoramic glass front and porch make it feel like a proper retreat in the backyard, and there is room for the whole family plus friends. DIY kit assembly took two of us a long…
Nathaniel Orenstein
★★★★★
Best backyard decision we made
After researching for months we went with the Serenity and have zero regrets. The barrel shape heats so evenly and the glass door looks premium. We use it almost every night in winter, the cedar holds heat beautifully.…
Bethany Crowe