{"product_id":"cozy-heat-o-thru-wall-sauna-stove","title":"Cozy Heat O Thru-Wall Sauna Stove","description":"\u003cp\u003eThe \u003cstrong\u003eCozy Heat O TW Thru-Wall Wood-Burning Sauna Stove\u003c\/strong\u003e combines traditional wood-fired sauna heat with a clean, elegant through-the-wall design. Hand crafted in Estonia, where sauna bathing is a way of life, the Cozy O TW lets you load firewood from outside the sauna for a tidy interior space. Its circular rim body, high stone mass, and efficient combustion deliver mild, long-lasting heat and rich, luxurious steam when you pour water over the hot sauna stones.\u003c\/p\u003e\n\u003ch2 id=\"keyfeatures\"\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrough-the-wall wood-burning sauna stove\u003c\/strong\u003e for loading firewood from outside the sauna room\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInnovative circular rim design\u003c\/strong\u003e that enhances both aesthetics and even heat distribution throughout the sauna\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-efficiency combustion\u003c\/strong\u003e uses approximately 25 to 40 percent less wood than many comparable sauna stoves\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean-burning performance\u003c\/strong\u003e with very low emissions and high efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge stone capacity\u003c\/strong\u003e for deep heat storage and soft, long-lasting löyly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable steel construction\u003c\/strong\u003e with a modern black finish\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloor-mounted thru-wall installation\u003c\/strong\u003e that keeps wood, ash, and mess outside the sauna room\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned and engineered in Estonia\u003c\/strong\u003e by a specialist wood-fired sauna stove manufacturer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"requiredcomponents\"\u003eRequired Components\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSauna Stones:\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCozy O TW 12 kW:\u003c\/strong\u003e Minimum \u003cstrong\u003e265 lbs\u003c\/strong\u003e of sauna stones\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCozy O TW 18 kW:\u003c\/strong\u003e Minimum \u003cstrong\u003e353 lbs\u003c\/strong\u003e of sauna stonesUse natural, angular sauna stones such as olivine or peridotite in the 10 to 15 cm range. Avoid river rocks or decorative stones. Many installers recommend ordering an extra box so you can hand select stone shapes for the best airflow, fit, and steam quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChimney System:\u003c\/strong\u003e A compatible, code compliant wood-burning sauna chimney and flue kit is required for safe installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"whatsincluded\"\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCozy Heat O TW thru-wall wood-burning sauna stove (12 kW or 18 kW model)\u003c\/li\u003e\n\u003cli\u003eOuter frame of the heater and thru-wall sleeve\u003c\/li\u003e\n\u003cli\u003eChimney connection outlet on top of the heater\u003c\/li\u003e\n\u003cli\u003eHeater body with integrated stone basket\u003c\/li\u003e\n\u003cli\u003eFirebox and door for loading from outside the sauna\u003c\/li\u003e\n\u003cli\u003eAsh box and cleaning access\u003c\/li\u003e\n\u003cli\u003eInstallation and Operation Manual\u003c\/li\u003e\n\u003cli\u003e2-year manufacturer warranty (residential use)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"specificationscozyotw12kw\"\u003eSpecifications: Cozy O TW 12 kW\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCozy O TW 12\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHeater Type\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWood-burning sauna stove, thru-wall, floor mounted\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower Output\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e12 kW\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSauna Room Size\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e210 to 423 cu ft (approximately 6 to 12 m³)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStone Requirement\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMinimum 265 lbs of sauna stones (10 to 15 cm)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions (D × W × H)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e24.08 in × 19.88 in × 29.76 in\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHeater Weight (Without Stones)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eApproximately 108 lbs\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRoom Size Heating Capacity\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUp to 423 cu ft (depending on insulation and materials)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation Type\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFloor mount, thru-wall firebox loaded from outside sauna room\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFlue Connection Location\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTop of heater to chimney system\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary Fuel\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWood logs only\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial \/ Finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSteel construction with black finish\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eHigh efficiency and low emissions, meets strict European standards\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEstonia\u003c\/p\u003e\n\u003ch2 id=\"specificationscozyotw18kw\"\u003eSpecifications: Cozy O TW 18 kW\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCozy O TW 18\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHeater Type\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWood-burning sauna stove, thru-wall, floor mounted\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower Output\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e18 kW\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSauna Room Size\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e317 to 635 cu ft (approximately 9 to 18 m³)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStone Requirement\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMinimum 353 lbs of sauna stones (10 to 15 cm)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions (D × W × H)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e24.58 in × 19.68 in × 29.76 in\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHeater Weight (Without Stones)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eApproximately 154 lbs\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRoom Size Heating Capacity\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUp to 635 cu ft (depending on insulation and materials)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation Type\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFloor mount, thru-wall firebox loaded from outside sauna room\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFlue Connection Location\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTop of heater to chimney system\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary Fuel\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWood logs only\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial \/ Finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSteel construction with black finish\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eHigh efficiency and low emissions, meets strict European standards\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEstonia\u003c\/p\u003e\n\u003ch2 id=\"whychoosethecozyheatotw\"\u003eWhy Choose the Cozy Heat O TW?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthentic wood-fired sauna experience\u003c\/strong\u003e with mild, long-lasting heat and naturally rich steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThru-wall firebox design\u003c\/strong\u003e keeps wood, ash, and mess outside the sauna room for a cleaner interior\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficient and eco conscious combustion\u003c\/strong\u003e that reduces wood consumption and emissions compared to many standard wood stoves\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge stone mass\u003c\/strong\u003e that stores heat and delivers smooth, consistent löyly even during longer sessions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistinctive circular rim look\u003c\/strong\u003e that adds a modern, sculptural focal point to your sauna design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"shippingreturns\"\u003eShipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShips:\u003c\/strong\u003e Typically within 3 to 7 business days (freight delivery with scheduled appointment)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDelivery:\u003c\/strong\u003e Free standard U.S. shipping to most locations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReturns:\u003c\/strong\u003e 14-day return policy on unused, uninstalled stoves in original packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e When stacking stones, place larger pieces at the bottom of the basket and medium stones toward the top so air can move freely between them. This helps the Cozy O TW heat faster, protects the firebox, and creates softer, more consistent steam. Inspect stones regularly and replace any that are cracked or flaking.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0739\/6455\/2421\/files\/Cozy_Heat_IOM.pdf?v=1764782666\" title=\"Cozy Heat Installation and Operation Manual\"\u003eInstallation and Operation Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0739\/6455\/2421\/files\/Cozy_Heat_Warranty.pdf?v=1764782800\" title=\"Cozy Heat Warranty\"\u003eWarranty\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2 id=\"frequentlyaskedquestions\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003eWhat is the difference between the Cozy O TW 12 kW and 18 kW models?\u003c\/p\u003e\n\u003cp\u003eThe Cozy O TW 12 is sized for sauna rooms from approximately 210 to 423 cubic feet and uses at least 265 pounds of stones. The Cozy O TW 18 is designed for larger rooms from about 317 to 635 cubic feet and uses at least 353 pounds of stones. If your sauna is larger, has more glass or tile, or is in a colder climate, the 18 kW model is usually the better choice.\u003c\/p\u003e\n\u003cp\u003eHow does a thru-wall sauna stove work?\u003c\/p\u003e\n\u003cp\u003eA thru-wall sauna stove is installed in a solid wall between your sauna room and an adjacent space. You load firewood from outside the sauna, while the heater body and stones sit in the sauna interior. This keeps the sauna cleaner and makes it easier to tend the fire without opening the sauna door as often.\u003c\/p\u003e\n\u003cp\u003eWhat kind of stones should I use and how many do I need?\u003c\/p\u003e\n\u003cp\u003eUse natural sauna stones such as olivine or peridotite in the 10 to 15 cm range. The Cozy O TW 12 requires at least 265 pounds of stones and the Cozy O TW 18 requires at least 353 pounds. Many installers order an extra box of stones so they can choose ideal shapes for airflow and fit inside the stone basket.\u003c\/p\u003e\n\u003cp\u003eHow long does it take to heat the sauna?\u003c\/p\u003e\n\u003cp\u003eMost saunas reach bathing temperature in about 45 to 75 minutes depending on room size, insulation, stone loading, and wood quality. The 18 kW model typically heats larger rooms more quickly because of its higher output and larger firebox.\u003c\/p\u003e\n\u003cp\u003eDoes the Cozy O TW require a chimney?\u003c\/p\u003e\n\u003cp\u003eYes. A certified wood-burning chimney system is required. Use flue pipe and chimney components that are rated for wood-burning sauna stoves and that comply with local building and fire codes. Professional installation is strongly recommended for safety and performance.\u003c\/p\u003e\n\u003cp\u003eDo I need professional installation?\u003c\/p\u003e\n\u003cp\u003eProfessional installation is highly recommended. A qualified installer will create and finish the wall opening, configure the chimney system, verify clearances to combustibles, and make sure the stove meets local building and fire safety requirements for wood-burning appliances.\u003c\/p\u003e","brand":"Your Spa Pool","offers":[{"title":"12kW","offer_id":53834077962573,"sku":null,"price":2182.5,"currency_code":"USD","in_stock":true},{"title":"18kW","offer_id":53834077995341,"sku":null,"price":2416.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0919\/1990\/9197\/files\/cozy-thru-wall-sauna-stove-rocks-top-view.jpg?v=1777941600","url":"https:\/\/yourspapool.com\/products\/cozy-heat-o-thru-wall-sauna-stove","provider":"Your Spa Pool","version":"1.0","type":"link"}