SKU:COZY OG TW 12
Cozy Heat OG Thru-Wall Sauna Stove - Wood-Burning Sauna Stove, Up to 18kW
Cozy Heat OG Thru-Wall Sauna Stove - Wood-Burning Sauna Stove, Up to 18kW
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See ways to pay →Ships direct from the manufacturer · curbside delivery in the contiguous US
Free shipping · On this item · contiguous US
Delivery is typically 5–15 business days after it ships. Made-to-order units are confirmed before the order is released.
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Cozy Heat OG Thru-Wall Sauna Stove - Wood-Burning Sauna Stove, Up to 18kW
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PRICE PROMISE
PRICE PROMISE
Fair Pricing, Every Time
As an authorized dealer, our prices reflect each manufacturer's approved pricing. That means the price you see here follows the manufacturer's own pricing.
Found a Lower Price?
If you've found the identical product advertised for less by another authorized dealer, email info@plungeintosaunas.com with a link. We'll review it, and if it's a genuine authorized listing we'll match it where the manufacturer permits.
Listings from unauthorized sellers, marketplaces, refurbished or open-box units, and clearance items aren't eligible — those products typically carry no manufacturer warranty.
Why Buying Authorized Matters
Authorized purchases come with full manufacturer warranty coverage, genuine parts, and factory support. A cheaper unit from an unauthorized seller usually has none of that.
SHIPPING POLICY
SHIPPING POLICY
Shipping Information
Most in-stock orders ship within 3–5 business days, with delivery typically taking 5–15 business days after shipment. Sauna cabins and larger units are often made to order and may require additional lead time, which we'll confirm before you buy.
Large items ship by freight carrier, curbside delivery. Cabins frequently arrive on two or more pallets. The carrier will contact you to schedule an appointment, and someone must be present to receive and inspect the shipment. Curbside means the driver delivers to the end of your driveway — moving, unpacking, assembly, and installation are not included.
Inspect your shipment before signing. Count the pallets, note any damage on the delivery receipt, take photos, and contact info@plungeintosaunas.com within 48 hours. Keep all packaging for up to 60 days in case the carrier needs to inspect it.
Delivery dates are estimates and may vary due to carrier delays, weather, or supplier lead times.
RETURN POLICY
RETURN POLICY
Return Information
Return requests must be approved in writing before any item is sent back — return addresses vary by supplier, and unauthorized returns may be refused or ineligible for refund.
The return window is 30 days on most brands. It runs from the delivery date on most lines, and from the purchase date on our Bathing Brands lines (Harvia, HUUM, SaunaLife, Saunum, Delta, Kohler, ThermaSol, Bathology, Cozy Heat, Rento, Hukka, EOS, AromaMist, Narvi, Finnmark, Kolo, 4 Living and Hotass Saunas).
Eligible products must be unused, uninstalled, unassembled, complete, and in original packaging. You are responsible for return shipping on a change-of-mind return. Fees vary by brand — some lines charge a restocking fee of up to 25%, while the Bathing Brands lines charge no restocking fee, only a re-boxing fee of roughly $20 to $50 if the original packaging is not returned intact.
If the item arrived damaged or a manufacturer error is at fault, return shipping is covered for you.
Custom, made-to-order, special-order, clearance, installed, assembled, or final-sale products may not be returnable.
Damaged, missing, or incorrect items must be reported to info@plungeintosaunas.com within 48 hours of delivery.
Cozy Heat OG Thru-Wall Sauna Stove - Wood-Burning Sauna Stove, Up to 18kW
Cozy Heat has taken the time-honored craft of building sauna stoves to a higher level. This wood-fired sauna stove is hand-made in Estonia, where sauna bathing is a national tradition.
The OG-TW's clever "Through-the-Wall" design lets you load firewood from outside your sauna. Wood-burning sauna stoves produce a mild and long-lasting heat and are designed for pouring water over hot stones to create your perfect amount of steam.
The part of the wood-burning heater that must be the strongest, the flame cutter, is made of sturdy, 5mm-thick stainless steel making COZY heaters extremely durable.
Cozy Heat's OG-TW model has an elegant and sophisticated trilateral design that is elegant and sophisticated, elevating the aesthetic appeal of your sauna. With its sleek lines and contemporary finish, this stove complements any sauna decor, creating a luxurious ambiance that beckons you.
Experience the pinnacle of comfort and sophistication with the Cozy Heat OG-TW!
Features & materials
- Artistically inventive design
- Wood-burning
- Steel construction
- Smoke gases are 6x cleaner
- German BIMSCH certificate
- Stove utilizes 25-40% less fuel than comparable sauna stoves
- Boasts minimal safety distances
- Mild and long-lasting heat
- Floor mount thru-wall
- Stone requirements:12kW - Minimum of 175 lbs of stones18kW - Minimum of 240 lbs of stonesPlease note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply).
- 12kW - Minimum of 175 lbs of stones
- 18kW - Minimum of 240 lbs of stonesPlease note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply).
- Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply).
- 2-year warranty
- Designed and engineered in Estonia
Shipping & delivery
Shipping cost: Shipping on this item is free within the contiguous US.
Most in-stock orders ship within 3–5 business days of confirmed payment, and delivery is typically 5–15 business days after shipment. Made-to-order saunas and custom-configured rooms need production time on top of that, which we confirm before the order is released. We ship within the contiguous United States.
Large items ship LTL freight on a pallet, delivered curbside — to the curb or the end of your driveway, often from a trailer up to 53 feet long. Curbside does not include unpacking, assembly, installation or electrical connection. The carrier calls to book an appointment and someone must be there to receive the shipment. Tell us at the time of order if access is limited — narrow or rural roads, steep driveways, gated communities — and ask for liftgate service if you have no dock or forklift.
Inspect the shipment before the driver leaves and before you sign. Count the cartons and pallets against the paperwork, check glass doors and panels, write any damage or shortage on the Delivery Receipt, and photograph it. Email info@plungeintosaunas.com within 48 hours of delivery with your order number, photos and the noted receipt — the same window covers concealed damage and missing items. Keep the packaging while a claim is open.
Cancellations & returns
Cancel before the order has been submitted for fulfillment and it is refunded in full — email info@plungeintosaunas.com with your order number. After that point manufacturer, carrier, return-freight or restocking fees may apply. Every return must be approved by us in writing first: products ship from different manufacturer warehouses, so the correct return address varies, and anything sent back without authorization may be refused.
Return requests are made within 30 days under our general policy; some brands run that window from the date of purchase rather than delivery. Items must be unused, uninstalled, never heated or filled, complete in their original packaging and in resalable condition. Restocking fees run up to 25% depending on the manufacturer, while Harvia, HUUM, SaunaLife, Saunum, Narvi, ThermaSol, Delta, Kohler and Mr. Steam charge no restocking fee at all, only a re-boxing fee of roughly $20–$50 if the original packaging does not come back intact. On a change-of-mind return you pay return shipping and the original outbound shipping is not refunded.
If the item arrived damaged or a manufacturer error is at fault, return shipping is covered for you. Custom, made-to-order and special-order items already in production, clearance and open-box items, heaters that have been wired or fired, tubs and generators that have been filled, assembled or heated rooms, opened consumables and all Canadian Timber Collection products cannot be returned. Ask us before you buy if you are unsure.
Complete your setup
Total for 1 item $2,452.50
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Cozy Heat OG Thru-Wall Sauna Stove -
- Free shippingOn this item · contiguous US
- Authorized dealerFull manufacturer warranty
- Sized by a specialistRoom, heater and install checked
- Talk to a human(888) 739-3321
Model specifications
The figures that decide the buy. The complete sheet ships with the manual.
- Model
- Cozy OG Thru-Wall 12
- Kilowatt Rating
- 12kW
- Primary Fuel
- Wood
- Maximum Firewood Length
- 12.99" (329mm)
- Diameter of Firewood
- 3.14" to 4.72" (80mm-120mm)
- Minimum Cubic Feet
- 210 Cu. Ft.
- Maximum Cubic Feet
- 423 Cu. Ft.
- Minimum Room Height
- 72" (1828mm)
- Flue Connection Location
- Top
- Heater Weight
- 139 lbs
- Shipping Weight with Sauna Stones
- 315 lbs
- Safety Distance Front to Back
- See Installation and Operation Manual
Manufacturer figures. The complete specification sheet, clearances and wiring details are in the manufacturer's installation manual.
Heater Size Calculator
This model comes in 2 outputs, 12.0–18.0 kW, covering sauna rooms from 210 to 635 adjusted cu ft.
A heater that is too small never reaches temperature; one that is too big cycles on and off and gives harsh, dry heat. Match the rated range to your room's adjusted volume — the calculator does the maths in under a minute, or call us with your dimensions.
- 12.0 kW 210423
- 18.0 kW 317635
The shaded bar is the room size this heater is rated for. Work out your room's adjusted cubic feet below, then check the number lands inside the bar.
Working out your adjusted cubic feet
- Room volume — length × width × height in feet.
- Glass and stone add load — count about 4 cu ft extra per square foot of glass, tile or stone wall.
- Uninsulated or log walls — multiply the total by 1.5.
Everything in the box
Exactly what ships with this model, straight from the manufacturer's packing list.
- Outer frame of the heater
- Chimney pipe
- Heater body
- Cleaning hatch
- Heater door with glass
- Ash box
- Installation and operation manual
- 2-Year Warranty
Sauna stones, water treatment and accessories are sold separately unless listed above.
Setting up
What happens between checkout and your first session.
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The Cozy OG Thru-Wall 12 weighs 139 lbs on its own, and 315 lbs boxed with its sauna stones. Check the carton for damage before you sign, and keep the packaging until the heater is installed and running.
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The room needs to be at least 72" (1828mm) high. A wood stove needs a chimney kit, a protected floor under the firebox and a heat shield wherever the manual calls for one; the flue connects at the top. Every figure here is on the spec table above and in the installation manual.
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The Cozy OG Thru-Wall 12 is rated for rooms of 210 Cu. Ft. to 423 Cu. Ft. at 12kW. Start with width × length × height, then adjust upward for glass, tile or stone, which all add load. Our Heater Size Calculator does the adjustment for you, or call us and we'll size it with you before you order.
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A chimney kit is needed and is listed separately. Check the What's included list above for exactly what ships in the box. Rinse and stack the stones loosely before the first heat-up, and add a bucket and ladle if you want to throw water.
Not sure your site is ready? Call (888) 739-3321 before you order and we'll walk through it with you.
Talk it through with a sauna specialist
Room size, heater match, electrical, delivery access — a ten-minute call answers most of it. No pressure, no sales script.
Daily, 8 AM to 7 PM Pacific. Or email info@plungeintosaunas.com any time.
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Sizing & fit
We'll check the footprint, ceiling height and heater match for your space. -
Electrical & site
What your electrician needs to know before you order. -
Delivery
Lead time, freight access and what to expect on delivery day.
What happens next
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We check the order
A sauna specialist reviews the configuration, the delivery address and freight access, and usually calls you to confirm it before the order is released to the manufacturer. Anything that needs changing gets changed before it ships.
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Confirmation and lead time
You get an email with the confirmed lead time, the manuals for your unit and what to prepare on site. Tracking follows within 24 hours of it leaving the warehouse.
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Delivery day and after
The freight carrier calls to book a curbside appointment — count the cartons and note any damage on the delivery receipt before you sign. Assembly, electrician and warranty questions after that come to us, and we handle them with the manufacturer on your behalf.
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Frequently Asked Questions
Yes! Shop Pay Installments may be available at checkout, allowing you to split your order into installment payments, with interest-free options on eligible orders and monthly plans from 0–36% APR. Just select Shop Pay at checkout to see your options.
Warranty coverage varies by manufacturer and product. Please refer to the product page or included documentation for specific details. Warranties are provided by the manufacturer. We're happy to help connect you with the manufacturer if you have a warranty question.
We ship within the contiguous United States only. We do not currently ship to Alaska, Hawaii, PO boxes, APO/FPO addresses, or international destinations.
No. Standard curbside delivery means the carrier delivers to the curb or end of your driveway only. The driver is not required to bring items into your home, garage, or backyard, and delivery does not include unpacking, assembly, or installation.
Yes. Our store is secured with SSL encryption and all payments are processed through Shopify's secure checkout. We never store your full credit card information.
Exchanges are handled on a case-by-case basis. Contact us at info@plungeintosaunas.com with your order number and the item you'd like instead. If approved, you may be responsible for price differences, return shipping, and any applicable restocking fees.