{"product_id":"harvia-m3-sl-wood-burning-sauna-stove","title":"Harvia M3 SL Wood Burning Sauna Stove","description":"\u003csection class=\"product-intro\"\u003e\n\u003cp\u003eThe Harvia M3 SL is a through-the-wall wood burning sauna stove that lets you feed the fire from an adjacent room or outdoors — keeping the sauna space clean, undisturbed, and consistently warm. Designed for sauna rooms between 159 and 459 cubic feet, it combines practical installation flexibility with a cast-iron-framed glass door that frames the fire for a classic, relaxed sauna atmosphere.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"product-why-choose\"\u003e\n\u003ch2 class=\"section-heading\"\u003eWhy Customers Choose the Harvia M3 SL\u003c\/h2\u003e\n\u003cul class=\"benefit-list\"\u003e\n\u003cli\u003eThrough-the-wall fire chamber keeps the sauna interior clean and uninterrupted during heating\u003c\/li\u003e\n\u003cli\u003eCast-iron-framed glass door provides a view of the fire for a traditional sauna ambiance\u003c\/li\u003e\n\u003cli\u003eAdjustable legs allow secure installation on uneven floors\u003c\/li\u003e\n\u003cli\u003eReversible door hinge accommodates left- or right-hand installation\u003c\/li\u003e\n\u003cli\u003eCompact footprint fits cabin, outdoor, and residential sauna builds\u003c\/li\u003e\n\u003cli\u003eBacked by Harvia, a globally recognized sauna equipment manufacturer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"product-highlights\"\u003e\n\u003ch2 class=\"section-heading\"\u003eProduct Highlights\u003c\/h2\u003e\n\n\u003cdiv class=\"highlight-item\"\u003e\n\u003ch3 class=\"highlight-subhead\"\u003eThrough-the-Wall Fire Chamber\u003c\/h3\u003e\n\u003cp\u003eThe firebox extends through the sauna wall so firewood can be loaded from an adjacent room or outdoors, eliminating the need to open the sauna door during a session.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"highlight-item\"\u003e\n\u003ch3 class=\"highlight-subhead\"\u003eCast-Iron-Framed Glass Door\u003c\/h3\u003e\n\u003cp\u003eA heat-resistant glass panel set in a cast-iron frame lets you observe the fire, adding warmth and character to the sauna environment.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"highlight-item\"\u003e\n\u003ch3 class=\"highlight-subhead\"\u003eAdjustable Legs\u003c\/h3\u003e\n\u003cp\u003eThe stove's legs can be adjusted to compensate for uneven flooring, making installation more straightforward in a variety of sauna structures.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"highlight-item\"\u003e\n\u003ch3 class=\"highlight-subhead\"\u003eReversible Door Hinge\u003c\/h3\u003e\n\u003cp\u003eThe door can be configured to open from either side, giving installers flexibility to work with different room layouts and wall placements.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"highlight-item\"\u003e\n\u003ch3 class=\"highlight-subhead\"\u003eGalvanized Steel Construction\u003c\/h3\u003e\n\u003cp\u003eBuilt from galvanized metal with a black finish, the M3 SL is designed to withstand the sustained high-heat environment of regular sauna use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"product-specifications\"\u003e\n\u003ch2 class=\"section-heading\"\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 M3 SL (WKM3SL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoom Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e159 – 459 cubic feet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15 3\/8\" W × 17\" D + 8 5\/8\" D collar × 28\" H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e110 lbs\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Firewood Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6\" diameter × 13 3\/4\" long\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStone Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90 lbs (3 boxes required, sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSmoke Outlet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTop\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGalvanized metal – black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThrough-the-wall, floor standing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e120-WKM3SL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"product-ideal-for\"\u003e\n\u003ch2 class=\"section-heading\"\u003eIdeal For\u003c\/h2\u003e\n\u003cul class=\"ideal-list\"\u003e\n\u003cli\u003eCabin and outdoor sauna installations\u003c\/li\u003e\n\u003cli\u003eResidential saunas in the 159–459 cubic foot range\u003c\/li\u003e\n\u003cli\u003eBuilders and homeowners who want external firewood access\u003c\/li\u003e\n\u003cli\u003eSauna enthusiasts seeking a traditional wood burning experience\u003c\/li\u003e\n\u003cli\u003eInstallations where keeping the sauna interior clean during heating is a priority\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"product-important-info\"\u003e\n\u003ch2 class=\"section-heading\"\u003eImportant Information\u003c\/h2\u003e\n\u003cul class=\"info-list\"\u003e\n\u003cli\u003eProfessional installation by a licensed contractor is strongly recommended. Consult local building and fire codes before installation.\u003c\/li\u003e\n\u003cli\u003eA proper chimney system is required. Review the chimney installation documentation provided by the manufacturer before purchasing.\u003c\/li\u003e\n\u003cli\u003eThe through-the-wall installation requires a correctly sized and fire-rated wall penetration. Follow all clearance requirements specified in the installation manual.\u003c\/li\u003e\n\u003cli\u003eSauna stones (3 boxes, 90 lbs total) are not included and must be purchased separately. Use only stones rated for sauna use.\u003c\/li\u003e\n\u003cli\u003eMaximum firewood size is 6\" diameter × 13 3\/4\" long. Do not exceed this size.\u003c\/li\u003e\n\u003cli\u003eKeep children and pets away from the stove during and after operation until fully cooled.\u003c\/li\u003e\n\u003cli\u003eThis stove is designed for sauna use only. Do not use for space heating or cooking.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"product-faq\"\u003e\n\u003ch2 class=\"section-heading\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eWhat size sauna room is the Harvia M3 SL designed for?\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cp\u003eThe Harvia M3 SL is rated for sauna rooms between 159 and 459 cubic feet. For best results, match the stove to your room's actual cubic footage using a sauna heater sizing guide.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eHow does the through-the-wall design work?\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cp\u003eThe firebox collar extends through a wall opening so the fire can be loaded from an adjacent room or from outside. This keeps the sauna interior clean and allows you to add wood without opening the sauna door or interrupting the session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eDoes the Harvia M3 SL come with sauna stones?\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cp\u003eNo. The stove requires approximately 90 lbs of sauna stones (3 boxes), which must be purchased separately. Use only stones specifically rated for sauna use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eDoes this stove require a chimney?\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cp\u003eYes. The Harvia M3 SL is a wood burning stove and requires a properly installed chimney system. Consult the manufacturer's chimney installation documentation and a licensed installer before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eCan the door be installed on either side?\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cp\u003eYes. The door hinge is reversible, so it can be configured to open from the left or right to suit your installation layout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails class=\"faq-item\"\u003e\n\u003csummary class=\"faq-question\"\u003eWhat is the maximum firewood size for the M3 SL?\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cp\u003eThe maximum firewood size is 6\" in diameter and 13 3\/4\" in length. Do not use firewood that exceeds these dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/section\u003e\n\n\u003csection class=\"product-closing\"\u003e\n\u003cp\u003eThe Harvia M3 SL is a practical, well-built through-the-wall wood burning sauna stove suited to cabin, outdoor, and residential sauna installations. If you're looking for a stove that keeps your sauna clean and your sessions uninterrupted, it's a strong option at this price point. Order today or reach out with any questions — we're happy to help you find the right fit.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003cp style=\"text-align:center;\"\u003e\u003csmall\u003eThis product is intended for sauna use only. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any condition or disease. Consult a qualified healthcare provider before use if you have any health concerns. Always follow the manufacturer's installation and safety guidelines.\u003c\/small\u003e\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 size sauna room is the Harvia M3 SL designed for?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Harvia M3 SL is rated for sauna rooms between 159 and 459 cubic feet. For best results, match the stove to your room's actual cubic footage using a sauna heater sizing guide.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the through-the-wall design work?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The firebox collar extends through a wall opening so the fire can be loaded from an adjacent room or from outside. This keeps the sauna interior clean and allows you to add wood without opening the sauna door or interrupting the session.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the Harvia M3 SL come with sauna stones?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. The stove requires approximately 90 lbs of sauna stones (3 boxes), which must be purchased separately. Use only stones specifically rated for sauna use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does this stove require a chimney?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The Harvia M3 SL is a wood burning stove and requires a properly installed chimney system. Consult the manufacturer's chimney installation documentation and a licensed installer before purchasing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can the door be installed on either side?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The door hinge is reversible, so it can be configured to open from the left or right to suit your installation layout.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the maximum firewood size for the M3 SL?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The maximum firewood size is 6\\\" in diameter and 13 3\/4\\\" in length. Do not use firewood that exceeds these dimensions.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Finnish Sauna Builders","offers":[{"title":"Default Title","offer_id":50263963238639,"sku":"120-WKM3SL","price":1416.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/7568\/4079\/files\/Harvia_M3_SL_WKM3SL_Wood_Burning_Sauna_Stove_-_Finnish_Sauna_Builders.webp?v=1785267067","url":"https:\/\/intentionalwellnesslab.com\/products\/harvia-m3-sl-wood-burning-sauna-stove","provider":"Intentional Wellness Lab","version":"1.0","type":"link"}