{"product_id":"harvia-20-sl-wood-burning-sauna-stove","title":"Harvia 20 SL Wood-Burning Sauna Stove","description":"\u003cp class=\"product-intro\"\u003eThe Harvia 20 SL is a wood-burning sauna stove built for saunas where the firebox is loaded from an adjacent room or from outside the building. Its through-wall design keeps wood, ash, and smoke management outside the sauna space, while the glass door brings warmth and visual character to the interior. Adjustable legs simplify installation on uneven floors, and a 6-inch pipe adapter is included to connect to standard chimney pipe. For small to medium-sized saunas where a traditional wood-fired experience is the priority, the 20 SL is a practical and well-built option.\u003c\/p\u003e\n\n\u003ch2 class=\"section-heading\" id=\"why-customers-choose\"\u003eWhy Customers Choose the Harvia 20 SL\u003c\/h2\u003e\n\u003cul class=\"benefit-list\"\u003e\n\u003cli\u003eThrough-wall firing design keeps wood loading and ash management outside the sauna room\u003c\/li\u003e\n\u003cli\u003eGlass door provides a view of the fire from inside the sauna\u003c\/li\u003e\n\u003cli\u003eAdjustable legs allow level installation on sloped or uneven floors\u003c\/li\u003e\n\u003cli\u003e6-inch pipe adapter included — converts metric pipe to standard US chimney pipe size\u003c\/li\u003e\n\u003cli\u003eCovers sauna rooms from 282 to 706 cubic feet\u003c\/li\u003e\n\u003cli\u003eUL Listed for safety compliance\u003c\/li\u003e\n\u003cli\u003eDoor opening direction can be reversed for flexible installation\u003c\/li\u003e\n\u003cli\u003eManufactured by Harvia, a Finnish sauna equipment manufacturer with decades of production history\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 class=\"section-heading\" id=\"product-highlights\"\u003eProduct Highlights\u003c\/h2\u003e\n\n\u003ch3 class=\"highlight-subhead\"\u003eThrough-Wall Firing Design\u003c\/h3\u003e\n\u003cp class=\"highlight-body\"\u003eThe 20 SL is engineered to be loaded from outside the sauna room — through a wall, from an adjacent space, or from outside the building. This keeps the sauna interior clean and free of wood debris and ash during and after use.\u003c\/p\u003e\n\n\u003ch3 class=\"highlight-subhead\"\u003eGlass Door\u003c\/h3\u003e\n\u003cp class=\"highlight-body\"\u003eAll Harvia SL series stoves include a glass door, allowing the fire to be visible from inside the sauna. The glass door adds to the atmosphere of the session while maintaining a sealed firebox.\u003c\/p\u003e\n\n\u003ch3 class=\"highlight-subhead\"\u003eReversible Door Opening\u003c\/h3\u003e\n\u003cp class=\"highlight-body\"\u003eThe door hinge can be configured to open from either side, giving installers flexibility to accommodate the wall opening direction and room layout without modification.\u003c\/p\u003e\n\n\u003ch3 class=\"highlight-subhead\"\u003eAdjustable Legs\u003c\/h3\u003e\n\u003cp class=\"highlight-body\"\u003eThe 20-series adjustable leg system allows the stove to be leveled during installation even when the floor surface is not perfectly flat — a practical feature for outdoor sauna buildings and older structures.\u003c\/p\u003e\n\n\u003ch3 class=\"highlight-subhead\"\u003eStandard 6-Inch Pipe Adapter Included\u003c\/h3\u003e\n\u003cp class=\"highlight-body\"\u003eThe stove ships with an adapter that converts the metric flue outlet to a standard 6-inch US chimney pipe size, simplifying connection to locally sourced chimney components.\u003c\/p\u003e\n\n\u003ch3 class=\"highlight-subhead\"\u003eUL Listed\u003c\/h3\u003e\n\u003cp class=\"highlight-body\"\u003eThe Harvia 20 SL is UL Listed, confirming it has been independently tested and meets applicable safety standards for use in the United States and Canada.\u003c\/p\u003e\n\n\u003ch2 class=\"section-heading\" id=\"specifications\"\u003eSpecifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHarvia 20 SL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWKPR20SLM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFuel Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWood-burning\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFiring Position\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThrough-wall (loaded from outside the sauna room)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoom Coverage (Min)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e282 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoom Coverage (Max)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e706 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWidth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 in (508 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDepth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e17 in (432 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 in (762 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDoor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGlass door (reversible opening direction)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLegs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAdjustable (for level installation on uneven floors)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlue Outlet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6-inch (adapter included to convert from metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSafety Certification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUL Listed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Manufacture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFinland\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e300 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2 class=\"section-heading\" id=\"in-the-box\"\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul class=\"inbox-list\"\u003e\n\u003cli\u003eHarvia 20 SL wood-burning sauna stove\u003c\/li\u003e\n\u003cli\u003e6-inch chimney pipe adapter (metric-to-standard conversion)\u003c\/li\u003e\n\u003cli\u003eAdjustable legs\u003c\/li\u003e\n\u003cli\u003eInstallation and operation manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 class=\"section-heading\" id=\"ideal-for\"\u003eIdeal For\u003c\/h2\u003e\n\u003cul class=\"ideal-list\"\u003e\n\u003cli\u003eSmall to medium-sized saunas between 282 and 706 cubic feet\u003c\/li\u003e\n\u003cli\u003eSauna buildings where wood loading from outside or an adjacent room is preferred\u003c\/li\u003e\n\u003cli\u003eOutdoor sauna cabins and detached sauna structures\u003c\/li\u003e\n\u003cli\u003eHomeowners who prefer a traditional wood-fired sauna experience\u003c\/li\u003e\n\u003cli\u003eInstallations where keeping the sauna interior free of wood and ash is a priority\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 class=\"section-heading\" id=\"important-information\"\u003eImportant Information\u003c\/h2\u003e\n\u003cul class=\"important-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional installation required.\u003c\/strong\u003e Wood-burning sauna stoves must be installed by a qualified professional in accordance with all applicable local building codes, fire codes, and clearance requirements. Improper installation creates a fire hazard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChimney system not included.\u003c\/strong\u003e A compatible chimney system must be sourced and installed separately. The included adapter converts the metric flue outlet to a standard 6-inch US pipe size. Consult a chimney professional to specify the correct system for your installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance requirements.\u003c\/strong\u003e Maintain all minimum clearances from combustible materials as specified in the installation manual. Do not reduce clearances without written authorization from the manufacturer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSauna stones not included.\u003c\/strong\u003e Sauna stones are required for proper operation and must be purchased separately. Use only stones rated for sauna use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrough-wall installation.\u003c\/strong\u003e The 20 SL is designed for through-wall firing. The wall penetration must be constructed in accordance with the installation manual and applicable fire codes. Do not use this stove as a freestanding unit without the appropriate wall installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for indoor residential heating.\u003c\/strong\u003e This stove is designed for sauna use only. Do not use it as a general-purpose wood stove or space heater.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVentilation.\u003c\/strong\u003e Adequate combustion air supply and exhaust ventilation must be provided as specified in the installation manual.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 class=\"section-heading\" id=\"faq\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eWhat does \"through-wall\" firing mean?\u003c\/summary\u003e\n\u003cp class=\"faq-answer\"\u003eThrough-wall firing means the firebox door and loading area are positioned on the exterior side of the sauna wall, so wood is added and ash is removed from outside the sauna room. The heat radiates through the stove body into the sauna interior, keeping the sauna space clean during use.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eWhat size sauna room is the 20 SL designed for?\u003c\/summary\u003e\n\u003cp class=\"faq-answer\"\u003eThe Harvia 20 SL is rated for sauna rooms between 282 and 706 cubic feet. Room size calculations should account for wall insulation, glass area, and ceiling height. Consult your installer or a sauna heater sizing guide to confirm the 20 SL is appropriate for your specific room.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eIs a chimney system included?\u003c\/summary\u003e\n\u003cp class=\"faq-answer\"\u003eNo. The chimney system must be purchased and installed separately. The stove includes an adapter that converts the metric flue outlet to a standard 6-inch US chimney pipe size. A chimney professional should specify the correct system for your installation and local code requirements.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eAre sauna stones included?\u003c\/summary\u003e\n\u003cp class=\"faq-answer\"\u003eNo. Sauna stones are not included and must be purchased separately. Use only stones rated for sauna use — do not substitute with other rock types, as this can damage the stove and create a safety hazard.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eCan the door opening direction be changed?\u003c\/summary\u003e\n\u003cp class=\"faq-answer\"\u003eYes. The door hinge on the 20 SL can be reversed to open from either side, providing flexibility to accommodate different wall opening configurations and room layouts.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eIs the 20 SL UL Listed?\u003c\/summary\u003e\n\u003cp class=\"faq-answer\"\u003eYes. The Harvia 20 SL is UL Listed, confirming it has been independently tested and meets applicable safety standards for use in the United States and Canada.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eCan the 20 SL be connected to a water tank?\u003c\/summary\u003e\n\u003cp class=\"faq-answer\"\u003eThe standard 20 SL model is not a boiler stove. Harvia does offer boiler variants in the 20-series that can be connected to a separate water tank. Contact your dealer to confirm which model is appropriate if a boiler connection is required.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eWhat are the floor clearance requirements?\u003c\/summary\u003e\n\u003cp class=\"faq-answer\"\u003eMinimum clearances from combustible materials are specified in the installation manual included with the stove. All clearance requirements must be followed as written. Do not reduce clearances without manufacturer authorization. Consult a qualified installer if you have questions about your specific installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp class=\"product-closing\"\u003eThe Harvia 20 SL is a well-built, UL Listed wood-burning stove for sauna owners who want a traditional fire-heated experience with the practical advantage of outside-room loading. If the specifications match your room size and installation setup, it is a reliable choice backed by Harvia's established manufacturing standards. Review the Important Information section and consult a qualified installer before ordering to confirm the 20 SL is the right fit for your project.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does through-wall firing mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Through-wall firing means the firebox door and loading area are positioned on the exterior side of the sauna wall, so wood is added and ash is removed from outside the sauna room. The heat radiates through the stove body into the sauna interior, keeping the sauna space clean during use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What size sauna room is the 20 SL designed for?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Harvia 20 SL is rated for sauna rooms between 282 and 706 cubic feet. Room size calculations should account for wall insulation, glass area, and ceiling height.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is a chimney system included?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. The chimney system must be purchased and installed separately. The stove includes an adapter that converts the metric flue outlet to a standard 6-inch US chimney pipe size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are sauna stones included?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Sauna stones are not included and must be purchased separately. Use only stones rated for sauna use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can the door opening direction be changed?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The door hinge on the 20 SL can be reversed to open from either side, providing flexibility to accommodate different wall opening configurations and room layouts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the 20 SL UL Listed?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The Harvia 20 SL is UL Listed, confirming it has been independently tested and meets applicable safety standards for use in the United States and Canada.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can the 20 SL be connected to a water tank?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The standard 20 SL model is not a boiler stove. Harvia does offer boiler variants in the 20-series that can be connected to a separate water tank. Contact your dealer to confirm which model is appropriate if a boiler connection is required.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What are the floor clearance requirements?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Minimum clearances from combustible materials are specified in the installation manual included with the stove. All clearance requirements must be followed as written. Consult a qualified installer if you have questions about your specific installation.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Finnish Sauna Builders","offers":[{"title":"Default Title","offer_id":50263969300719,"sku":"WKPR20SLM","price":1781.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/7568\/4079\/files\/finlandia-harvia-36-heater-wood-burning-sauna-stove-17476805951523_2048x2048_327017d2-e1d7-4ff2-8236-d983c26daf40.jpg?v=1785267073","url":"https:\/\/intentionalwellnesslab.com\/products\/harvia-20-sl-wood-burning-sauna-stove","provider":"Intentional Wellness Lab","version":"1.0","type":"link"}