{"product_id":"cozy-heat-sw-thru-wall-sauna-stove","title":"Harvia Cozy Heat SW Thru-Wall Sauna Stove - 4745010348068","description":"\u003ch2\u003e Harvia Cozy Heat SW Thru-Wall Sauna Stove - 4745010348068\u003c\/h2\u003e\n\u003cp\u003eCOZY has elevated the art of building  with the SW-TW, featuring a convenient through-the-wall design that allows you to load firewood from outside the sauna, keeping the interior clean and clutter-free. Handcrafted in Estonia, where sauna bathing is a way of life, these stoves are built for performance, durability, and strength. The flame cutter, made from robust 5mm-thick stainless steel, ensures exceptional durability. Designed to provide mild, long-lasting heat, the SW-TW is perfect for ladling water over hot stones to create a satisfying steam sauna experience. Elevate your comfort and style with the  SW-TW wood stove.\u003c\/p\u003e\n\u003ch5 class=\"table-responsive\"\u003eWhat our Experts Think\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"1quvyki\" data-start=\"27\" data-end=\"152\"\u003ePremium \u003cstrong data-start=\"37\" data-end=\"98\"\u003eHarvia Cozy Heat SW Thru-Wall Sauna Stove (4745010348068)\u003c\/strong\u003e designed for authentic wood-fired sauna performance\u003c\/li\u003e\n\u003cli data-section-id=\"1nnmc7d\" data-start=\"153\" data-end=\"274\"\u003eUnique \u003cstrong data-start=\"162\" data-end=\"197\"\u003ethrough-the-wall loading system\u003c\/strong\u003e lets you feed firewood from outside the sauna for cleaner, safer operation\u003c\/li\u003e\n\u003cli data-section-id=\"mvdb5l\" data-start=\"275\" data-end=\"381\"\u003eHandcrafted in Estonia for a \u003cstrong data-start=\"306\" data-end=\"379\"\u003etrue traditional Nordic sauna experience with long, even radiant heat\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1dycb47\" data-start=\"382\" data-end=\"477\"\u003eHigh-efficiency combustion reduces fuel use by \u003cstrong data-start=\"431\" data-end=\"475\"\u003e~25–40% compared to standard wood stoves\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"4zj4m6\" data-start=\"478\" data-end=\"567\"\u003eProduces \u003cstrong data-start=\"489\" data-end=\"565\"\u003esoft, long-lasting heat ideal for extended sauna sessions and relaxation\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1u7gxvc\" data-start=\"568\" data-end=\"660\"\u003eDesigned for \u003cstrong data-start=\"583\" data-end=\"605\"\u003erich löyly (steam)\u003c\/strong\u003e when water is poured over the large heated stone bed\u003c\/li\u003e\n\u003cli data-section-id=\"1k3mgfy\" data-start=\"661\" data-end=\"759\"\u003eBuilt with heavy-duty steel and reinforced firebox for \u003cstrong data-start=\"718\" data-end=\"757\"\u003edurability and high heat resistance\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"9iw7hx\" data-start=\"760\" data-end=\"855\"\u003eEngineered for \u003cstrong data-start=\"777\" data-end=\"853\"\u003emedium to large sauna rooms (approx. 12–18kW depending on configuration)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"152e5pp\" data-start=\"856\" data-end=\"947\"\u003eSupports large stone mass for \u003cstrong data-start=\"888\" data-end=\"945\"\u003estable temperature retention and smoother heat cycles\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1lrs6uo\" data-start=\"948\" data-end=\"1073\"\u003eIdeal for users wanting a \u003cstrong data-start=\"976\" data-end=\"1073\"\u003epremium wood-burning sauna stove with modern thru-wall convenience and traditional sauna feel\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5 class=\"table-responsive\"\u003e\n\u003cbr\u003eQ\u0026amp;A\u003c\/h5\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:4eb04200-2e5b-4897-889d-65020d28c2a7-25\" data-testid=\"conversation-turn-40\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"8078cd64-a7a2-4c1b-bf43-8d9b833e8b8e\" data-turn-start-message=\"true\" dir=\"auto\" data-message-model-slug=\"gpt-5-3-mini\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"\u003e\n\u003cp data-start=\"80\" data-end=\"387\"\u003e\u003cstrong data-start=\"80\" data-end=\"149\"\u003eQ: What type of sauna stove is the Harvia Cozy Heat SW Thru-Wall?\u003c\/strong\u003e\u003cbr data-start=\"149\" data-end=\"152\"\u003eA: It is a \u003cstrong data-start=\"163\" data-end=\"201\"\u003ewood-burning thru-wall sauna stove\u003c\/strong\u003e designed for \u003cstrong data-start=\"215\" data-end=\"258\"\u003etraditional Finnish-style sauna bathing\u003c\/strong\u003e, where heat comes from burning wood and pouring water over hot stones for steam (löyly). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"389\" data-end=\"664\"\u003e\u003cstrong data-start=\"389\" data-end=\"440\"\u003eQ: What is the benefit of the thru-wall design?\u003c\/strong\u003e\u003cbr data-start=\"440\" data-end=\"443\"\u003eA: The firebox is accessed from outside the sauna, so you can \u003cstrong data-start=\"505\" data-end=\"588\"\u003eload wood without bringing dirt, smoke, or heat disturbance into the sauna room\u003c\/strong\u003e, improving comfort and cleanliness. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"666\" data-end=\"893\"\u003e\u003cstrong data-start=\"666\" data-end=\"708\"\u003eQ: What sauna size is it suitable for?\u003c\/strong\u003e\u003cbr data-start=\"708\" data-end=\"711\"\u003eA: The 12kW version typically supports \u003cstrong data-start=\"750\" data-end=\"810\"\u003esmall to medium saunas (approx. 210–423 cu ft \/ 6–12 m³)\u003c\/strong\u003e depending on insulation and build quality. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"895\" data-end=\"1121\"\u003e\u003cstrong data-start=\"895\" data-end=\"936\"\u003eQ: What kind of heat does it produce?\u003c\/strong\u003e\u003cbr data-start=\"936\" data-end=\"939\"\u003eA: It delivers a \u003cstrong data-start=\"956\" data-end=\"999\"\u003esoft, steady, long-lasting radiant heat\u003c\/strong\u003e, preferred for traditional sauna bathing rather than fast electric-style heating. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1123\" data-end=\"1330\"\u003e\u003cstrong data-start=\"1123\" data-end=\"1163\"\u003eQ: How does it create steam (löyly)?\u003c\/strong\u003e\u003cbr data-start=\"1163\" data-end=\"1166\"\u003eA: Water is poured onto \u003cstrong data-start=\"1190\" data-end=\"1213\"\u003eheated sauna stones\u003c\/strong\u003e, producing \u003cstrong data-start=\"1225\" data-end=\"1253\"\u003erich, humid steam bursts\u003c\/strong\u003e that intensify the sauna experience. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1332\" data-end=\"1510\"\u003e\u003cstrong data-start=\"1332\" data-end=\"1367\"\u003eQ: Does it require electricity?\u003c\/strong\u003e\u003cbr data-start=\"1367\" data-end=\"1370\"\u003eA: No. It is a \u003cstrong data-start=\"1385\" data-end=\"1412\"\u003efully wood-fired heater\u003c\/strong\u003e, operating without any electrical components for heating. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1512\" data-end=\"1730\"\u003e\u003cstrong data-start=\"1512\" data-end=\"1555\"\u003eQ: How much stone capacity does it use?\u003c\/strong\u003e\u003cbr data-start=\"1555\" data-end=\"1558\"\u003eA: It requires a \u003cstrong data-start=\"1575\" data-end=\"1635\"\u003elarge stone load (around 265 lbs minimum for 12kW setup)\u003c\/strong\u003e, which helps stabilize heat and improve steam quality. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1732\" data-end=\"1951\"\u003e\u003cstrong data-start=\"1732\" data-end=\"1771\"\u003eQ: What materials is it built from?\u003c\/strong\u003e\u003cbr data-start=\"1771\" data-end=\"1774\"\u003eA: It is made from \u003cstrong data-start=\"1793\" data-end=\"1858\"\u003eheavy-duty steel with a reinforced 5mm stainless flame cutter\u003c\/strong\u003e, designed for high durability and long service life. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1953\" data-end=\"2156\"\u003e\u003cstrong data-start=\"1953\" data-end=\"1981\"\u003eQ: Is it fuel efficient?\u003c\/strong\u003e\u003cbr data-start=\"1981\" data-end=\"1984\"\u003eA: Yes. It is engineered to use \u003cstrong data-start=\"2016\" data-end=\"2071\"\u003eabout 25–40% less wood than comparable sauna stoves\u003c\/strong\u003e, while still maintaining strong heat output. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2158\" data-end=\"2383\"\u003e\u003cstrong data-start=\"2158\" data-end=\"2192\"\u003eQ: Who is this stove best for?\u003c\/strong\u003e\u003cbr data-start=\"2192\" data-end=\"2195\"\u003eA: It is ideal for users who want a \u003cstrong data-start=\"2231\" data-end=\"2344\"\u003etraditional wood-fired sauna experience with the convenience of external loading and a cleaner sauna interior\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003ch5 class=\"table-responsive\"\u003e\n\u003cbr\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"houwvm\" data-start=\"82\" data-end=\"165\"\u003eRemove ash after every use to maintain strong airflow and efficient combustion.\u003c\/li\u003e\n\u003cli data-section-id=\"ilsx6\" data-start=\"166\" data-end=\"279\"\u003eUse only dry, seasoned firewood to reduce soot and improve heat output. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"11hg9yt\" data-start=\"280\" data-end=\"367\"\u003eClean chimney and flue regularly to prevent creosote buildup and ensure safe draft.\u003c\/li\u003e\n\u003cli data-section-id=\"1of4n39\" data-start=\"368\" data-end=\"485\"\u003eRe-stack sauna stones periodically; keep them loosely arranged for proper heat circulation and steam performance.\u003c\/li\u003e\n\u003cli data-section-id=\"sofx59\" data-start=\"486\" data-end=\"573\"\u003eReplace cracked or crumbling stones to prevent airflow restriction and overheating.\u003c\/li\u003e\n\u003cli data-section-id=\"xf0wvi\" data-start=\"574\" data-end=\"662\"\u003eCheck thru-wall firebox and loading chamber for soot buildup, warping, or seal wear.\u003c\/li\u003e\n\u003cli data-section-id=\"19k755l\" data-start=\"663\" data-end=\"743\"\u003eInspect door seals and joints to ensure tight closure and prevent air leaks.\u003c\/li\u003e\n\u003cli data-section-id=\"12k3bfe\" data-start=\"744\" data-end=\"827\"\u003eKeep external loading side (thru-wall feed) clear of ash, debris, and moisture.\u003c\/li\u003e\n\u003cli data-section-id=\"xe0vxx\" data-start=\"828\" data-end=\"911\"\u003eWipe exterior steel surfaces after cooling to prevent rust and maintain finish.\u003c\/li\u003e\n\u003cli data-section-id=\"t0hrmg\" data-start=\"912\" data-end=\"1003\"\u003eEnsure sauna room ventilation remains unobstructed for safe combustion and stable heat.\u003c\/li\u003e\n\u003cli data-section-id=\"l3jgng\" data-start=\"1004\" data-end=\"1135\"\u003eSchedule annual chimney inspection and deep cleaning for long-term safety and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Harvia","offers":[{"title":"Default Title","offer_id":45598897995967,"sku":"4745010348068","price":1885.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0683\/5703\/0079\/files\/cozy-12sw-tw-sauna-stove-main-Edit.png?v=1777390026","url":"https:\/\/backyardprovider.com\/products\/cozy-heat-sw-thru-wall-sauna-stove","provider":"Your Outdoor Setup Starts Here","version":"1.0","type":"link"}