{"product_id":"cozy-heat-quattro-thru-wall-sauna-stove","title":"Harvia Cozy Heat Quattro Thru-Wall Sauna Stove - 4745010348266","description":"\u003cdiv class=\"paragraph paragraph--type--simple-table paragraph--view-mode--default\"\u003e\n\u003cdiv class=\"field field--name-field-table field--type-tablefield field--label-hidden field--item\"\u003e\n\u003cdiv class=\"tablefield-wrapper\" id=\"tablefield-wrapper-paragraph-1420959-field_table-0\"\u003e\n\u003ch2 class=\"table-responsive\"\u003eHarvia Cozy Heat Quattro Thru-Wall Sauna Stove - 4745010348266\u003c\/h2\u003e\n\u003cdiv class=\"table-responsive\"\u003eEnhance your sauna experience with the Quattro 12 TW from . Handcrafted in Estonia, this stylish wood-burning stove features a through-the-wall design for convenient firewood loading from outside. It produces mild, long-lasting heat, perfect for creating luxurious steam with water ladled over hot stones. Made with durable 5mm-thick stainless steel, the Quattro 12 TW boasts clean lines, a minimalist design, and a large viewing window to enjoy the calming glow of the flames. Discover the timeless allure and relaxation of a  with the Cozy Heat Quattro 12 TW.\u003c\/div\u003e\n\u003cdiv class=\"table-responsive\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch5 class=\"table-responsive\"\u003eWhat our Experts Think\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"14kluj3\" data-start=\"27\" data-end=\"164\"\u003ePremium \u003cstrong data-start=\"37\" data-end=\"103\"\u003eHarvia Cozy Heat Quattro Thru-Wall Sauna Stove (4745010348266)\u003c\/strong\u003e designed for authentic wood-fired Nordic sauna performance\u003c\/li\u003e\n\u003cli data-section-id=\"1u0w0ui\" data-start=\"165\" data-end=\"298\"\u003eUnique \u003cstrong data-start=\"174\" data-end=\"209\"\u003ethrough-the-wall loading system\u003c\/strong\u003e allows firewood to be added from outside the sauna for improved safety and convenience\u003c\/li\u003e\n\u003cli data-section-id=\"x91zsn\" data-start=\"299\" data-end=\"406\"\u003eHandcrafted in Estonia for a \u003cstrong data-start=\"330\" data-end=\"404\"\u003etrue traditional sauna experience with long-lasting, mild radiant heat\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1f7b2fc\" data-start=\"407\" data-end=\"550\"\u003eHigh-efficiency combustion system reduces firewood use by \u003cstrong data-start=\"467\" data-end=\"510\"\u003e~25–40% compared to conventional stoves\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"v9zsml\" data-start=\"551\" data-end=\"647\"\u003eProduces \u003cstrong data-start=\"562\" data-end=\"598\"\u003erich, high-quality steam (löyly)\u003c\/strong\u003e when water is poured over the large stone mass\u003c\/li\u003e\n\u003cli data-section-id=\"1wzo4iz\" data-start=\"648\" data-end=\"803\"\u003eBuilt with heavy-duty steel construction and a \u003cstrong data-start=\"697\" data-end=\"763\"\u003ereinforced 5mm flame cutter for durability and heat resistance\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1jg5ji6\" data-start=\"804\" data-end=\"897\"\u003eDesigned for \u003cstrong data-start=\"819\" data-end=\"895\"\u003emedium to large sauna rooms (approx. 12–18kW depending on configuration)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"4qrvyl\" data-start=\"898\" data-end=\"993\"\u003eOptimized airflow supports \u003cstrong data-start=\"927\" data-end=\"991\"\u003ecleaner combustion and more stable, even heating performance\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1cclzkk\" data-start=\"994\" data-end=\"1091\"\u003eIncludes a large stone capacity for \u003cstrong data-start=\"1032\" data-end=\"1089\"\u003esteady heat retention and smoother temperature cycles\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1nkt54x\" data-start=\"1092\" data-end=\"1233\"\u003eIdeal for users wanting a \u003cstrong data-start=\"1120\" data-end=\"1231\"\u003epremium, modern thru-wall wood sauna stove with traditional sauna authenticity and improved fuel efficiency\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-65020d28c2a7-26\" data-testid=\"conversation-turn-42\" 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=\"659a1e19-141d-4dfb-b54b-1224ff84a58a\" 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=\"85\" data-end=\"385\"\u003e\u003cstrong data-start=\"85\" data-end=\"142\"\u003eQ: What type of sauna stove is the Cozy Heat Quattro?\u003c\/strong\u003e\u003cbr data-start=\"142\" data-end=\"145\"\u003eA: It is a \u003cstrong data-start=\"156\" data-end=\"194\"\u003ewood-burning thru-wall sauna stove\u003c\/strong\u003e designed for \u003cstrong data-start=\"208\" data-end=\"251\"\u003etraditional Finnish-style sauna bathing\u003c\/strong\u003e, where heat is generated by burning wood and steam is created by pouring water on hot stones. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"387\" data-end=\"678\"\u003e\u003cstrong data-start=\"387\" data-end=\"451\"\u003eQ: What is the main benefit of the Quattro thru-wall design?\u003c\/strong\u003e\u003cbr data-start=\"451\" data-end=\"454\"\u003eA: The firebox is accessed from outside the sauna, allowing you to \u003cstrong data-start=\"521\" data-end=\"566\"\u003eload wood without entering the sauna room\u003c\/strong\u003e, keeping the interior cleaner, cooler, and more comfortable during use. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"680\" data-end=\"730\"\u003e\u003cstrong data-start=\"680\" data-end=\"723\"\u003eQ: What sauna sizes is it suitable for?\u003c\/strong\u003e\u003cbr data-start=\"723\" data-end=\"726\"\u003eA:\u003c\/p\u003e\n\u003cul data-start=\"731\" data-end=\"884\"\u003e\n\u003cli data-section-id=\"wetw45\" data-start=\"731\" data-end=\"788\"\u003e\n\u003cstrong data-start=\"733\" data-end=\"750\"\u003e12kW version:\u003c\/strong\u003e approx. \u003cstrong data-start=\"759\" data-end=\"786\"\u003e210–423 cu ft (6–12 m³)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1ye7ikk\" data-start=\"789\" data-end=\"884\"\u003e\n\u003cstrong data-start=\"791\" data-end=\"808\"\u003e18kW version:\u003c\/strong\u003e approx. \u003cstrong data-start=\"817\" data-end=\"844\"\u003e317–635 cu ft (9–18 m³)\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"886\" data-end=\"1113\"\u003e\u003cstrong data-start=\"886\" data-end=\"927\"\u003eQ: What kind of heat does it produce?\u003c\/strong\u003e\u003cbr data-start=\"927\" data-end=\"930\"\u003eA: It delivers a \u003cstrong data-start=\"947\" data-end=\"982\"\u003emild, long-lasting radiant heat\u003c\/strong\u003e, designed for slow, even warming rather than fast spikes—ideal for relaxed sauna sessions. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1115\" data-end=\"1358\"\u003e\u003cstrong data-start=\"1115\" data-end=\"1155\"\u003eQ: How does it create steam (löyly)?\u003c\/strong\u003e\u003cbr data-start=\"1155\" data-end=\"1158\"\u003eA: Water is poured onto \u003cstrong data-start=\"1182\" data-end=\"1248\"\u003elarge heated stone mass (about 265–353 lbs depending on model)\u003c\/strong\u003e, producing \u003cstrong data-start=\"1260\" data-end=\"1287\"\u003erich, soft steam bursts\u003c\/strong\u003e for traditional sauna bathing. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1360\" data-end=\"1499\"\u003e\u003cstrong data-start=\"1360\" data-end=\"1395\"\u003eQ: Does it require electricity?\u003c\/strong\u003e\u003cbr data-start=\"1395\" data-end=\"1398\"\u003eA: No. It is a \u003cstrong data-start=\"1413\" data-end=\"1440\"\u003efully wood-fired heater\u003c\/strong\u003e, requiring no electrical connection for heat production.\u003c\/p\u003e\n\u003cp data-start=\"1501\" data-end=\"1781\"\u003e\u003cstrong data-start=\"1501\" data-end=\"1564\"\u003eQ: What makes the Quattro different from basic wood stoves?\u003c\/strong\u003e\u003cbr data-start=\"1564\" data-end=\"1567\"\u003eA: It uses a \u003cstrong data-start=\"1580\" data-end=\"1647\"\u003ehigh-efficiency combustion design (up to 25–40% lower fuel use)\u003c\/strong\u003e and features \u003cstrong data-start=\"1661\" data-end=\"1704\"\u003ecleaner-burning certification standards\u003c\/strong\u003e, improving efficiency and emissions. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1783\" data-end=\"2009\"\u003e\u003cstrong data-start=\"1783\" data-end=\"1821\"\u003eQ: What materials is it made from?\u003c\/strong\u003e\u003cbr data-start=\"1821\" data-end=\"1824\"\u003eA: It is built from \u003cstrong data-start=\"1844\" data-end=\"1909\"\u003eheavy-duty steel with a reinforced 5mm stainless flame cutter\u003c\/strong\u003e, designed for durability and long-term high-heat operation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2011\" data-end=\"2185\"\u003e\u003cstrong data-start=\"2011\" data-end=\"2052\"\u003eQ: Is it suitable for commercial use?\u003c\/strong\u003e\u003cbr data-start=\"2052\" data-end=\"2055\"\u003eA: It is primarily designed for \u003cstrong data-start=\"2087\" data-end=\"2134\"\u003eresidential and private sauna installations\u003c\/strong\u003e, though its build quality supports frequent use.\u003c\/p\u003e\n\u003cp data-start=\"2187\" data-end=\"2423\"\u003e\u003cstrong data-start=\"2187\" data-end=\"2254\"\u003eQ: What is the main advantage of the Cozy Heat Quattro overall?\u003c\/strong\u003e\u003cbr data-start=\"2254\" data-end=\"2257\"\u003eA: It offers a \u003cstrong data-start=\"2272\" data-end=\"2422\"\u003etraditional wood-fired sauna experience with modern efficiency, strong steam output, and the convenience of external wood loading through the wall\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003cdiv aria-hidden=\"true\" class=\"pointer-events-none -mt-px h-px translate-y-[calc(var(--scroll-root-safe-area-inset-bottom)-14*var(--spacing))]\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch5 class=\"table-responsive\"\u003e\n\u003cbr\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cdiv class=\"table-responsive\"\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"h2us70\" data-start=\"87\" data-end=\"213\"\u003eRemove ash after every use to maintain strong airflow and efficient wood combustion. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"17qt653\" data-start=\"214\" data-end=\"347\"\u003eUse only dry, seasoned firewood to reduce soot buildup and improve heat output consistency. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"hs7c99\" data-start=\"348\" data-end=\"447\"\u003eClean chimney and flue regularly to prevent creosote buildup and ensure safe draft performance.\u003c\/li\u003e\n\u003cli data-section-id=\"12w29hs\" data-start=\"448\" data-end=\"598\"\u003eRe-stack sauna stones periodically; keep them loosely arranged to allow proper airflow and steam generation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"8j6e5p\" data-start=\"599\" data-end=\"702\"\u003eReplace cracked or crumbling stones to avoid airflow restriction and overheating of the stove body.\u003c\/li\u003e\n\u003cli data-section-id=\"1abw0nr\" data-start=\"703\" data-end=\"795\"\u003eInspect thru-wall loading chamber and seals for soot buildup, heat stress, or air leaks.\u003c\/li\u003e\n\u003cli data-section-id=\"1051qin\" data-start=\"796\" data-end=\"923\"\u003eCheck firebox and flame cutter (5mm steel plate) during cleaning for wear or warping. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"8jl2db\" data-start=\"924\" data-end=\"1019\"\u003eEnsure door seals close tightly to maintain efficient combustion and prevent smoke leakage.\u003c\/li\u003e\n\u003cli data-section-id=\"1t4u9mg\" data-start=\"1020\" data-end=\"1111\"\u003eWipe exterior steel surfaces after cooling to prevent rust and maintain finish quality.\u003c\/li\u003e\n\u003cli data-section-id=\"1m3cjqk\" data-start=\"1112\" data-end=\"1199\"\u003eMaintain clear ventilation in the sauna room for stable burning and safe operation.\u003c\/li\u003e\n\u003cli data-section-id=\"13fivld\" data-start=\"1200\" data-end=\"1292\" data-is-last-node=\"\"\u003eSchedule annual chimney inspection and deep cleaning for long-term safety and efficienc\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"paragraph paragraph--type--simple-table paragraph--view-mode--default\"\u003e\n\u003cdiv class=\"field field--name-field-table field--type-tablefield field--label-hidden field--item\"\u003e\n\u003cdiv class=\"tablefield-wrapper\" id=\"tablefield-wrapper-paragraph-1420960-field_table-0\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Harvia","offers":[{"title":"Default Title","offer_id":45598897733823,"sku":"4745010348266","price":1488.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0683\/5703\/0079\/files\/cozy-quattro-tw-wood-sauna-stove.png?v=1777390021","url":"https:\/\/www.mybackyardzone.com\/products\/cozy-heat-quattro-thru-wall-sauna-stove","provider":"Your Outdoor Setup Starts Here","version":"1.0","type":"link"}