{"product_id":"huum-hive-heat-ls-12","title":"Harvia HUUM Hive Heat 12kW LS Wood-Burning Sauna Stove with Firebox Extension - H1012012","description":"\u003ch2\u003eHarvia HUUM Hive Heat 12kW LS Wood-Burning Sauna Stove with Firebox Extension - H1012012\u003c\/h2\u003e\n\u003cp\u003eThe HUUM Hive Heat 12kW LS , featuring a convenient firebox extension, is engineered for an exceptional sauna experience, perfect for medium-sized saunas with its rapid and consistent heat distribution. The innovative firebox extension allows for easy wood loading from an adjacent room, ensuring an uninterrupted and serene sauna session. Renowned for superior craftsmanship, blends traditional techniques with modern design, and the Hive Heat 12kW LS reflects their commitment to quality and sustainability, crafted from premium stainless steel for durability. By incorporating this eco-friendly stove, you minimize your ecological impact while enjoying an authentic sauna experience, all within a stylish design that transforms your wellness space into a serene sanctuary.\u003c\/p\u003e\n\u003ch5\u003eWhat our Experts Think\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"f50qxc\" data-start=\"28\" data-end=\"254\"\u003e\n\u003cstrong data-start=\"30\" data-end=\"64\"\u003eSmart dual-room heating design\u003c\/strong\u003e – The 12kW LS model with firebox extension is built for \u003cstrong data-start=\"121\" data-end=\"160\"\u003eloading wood from outside the sauna\u003c\/strong\u003e, improving safety, cleanliness, and user convenience. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1sjlpna\" data-start=\"255\" data-end=\"444\"\u003e\n\u003cstrong data-start=\"257\" data-end=\"282\"\u003eEfficient 12kW output\u003c\/strong\u003e – Ideal for \u003cstrong data-start=\"295\" data-end=\"344\"\u003esmall to medium sauna rooms (approx. 6–13 m³)\u003c\/strong\u003e with fast, stable heat build-up and consistent performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"sojscq\" data-start=\"445\" data-end=\"616\"\u003e\n\u003cstrong data-start=\"447\" data-end=\"472\"\u003ePremium steam quality\u003c\/strong\u003e – Around \u003cstrong data-start=\"482\" data-end=\"540\"\u003e90 kg stone capacity delivers soft, long-lasting löyly\u003c\/strong\u003e, avoiding harsh or dry heat spikes. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"gluhgb\" data-start=\"617\" data-end=\"813\"\u003e\n\u003cstrong data-start=\"619\" data-end=\"651\"\u003eClean-burning airflow system\u003c\/strong\u003e – Engineered to direct fresh air into combustion for a \u003cstrong data-start=\"707\" data-end=\"772\"\u003estronger, more complete burn with reduced waste and emissions\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1r4584e\" data-start=\"814\" data-end=\"1024\"\u003e\n\u003cstrong data-start=\"816\" data-end=\"847\"\u003eFirebox extension advantage\u003c\/strong\u003e – Experts highlight it as a major usability upgrade, allowing \u003cstrong data-start=\"910\" data-end=\"983\"\u003ewood feeding from another room and keeping the sauna space smoke-free\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"pr264p\" data-start=\"1025\" data-end=\"1180\"\u003e\n\u003cstrong data-start=\"1027\" data-end=\"1052\"\u003eDurable build quality\u003c\/strong\u003e – Stainless steel construction with cast iron door ensures \u003cstrong data-start=\"1112\" data-end=\"1177\"\u003ehigh heat resistance and long service life under repeated use\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli data-section-id=\"1y5jft4\" data-start=\"1181\" data-end=\"1337\"\u003e\n\u003cstrong data-start=\"1183\" data-end=\"1215\"\u003eTraditional sauna experience\u003c\/strong\u003e – Combines \u003cstrong data-start=\"1227\" data-end=\"1306\"\u003ereal wood fire atmosphere, crackling heat, and modern engineering precision\u003c\/strong\u003e for authentic sauna rituals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\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:ed4b79db-a286-48d0-ac1c-a61b14ce8f37-4\" data-testid=\"conversation-turn-6\" 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=\"e6787f1c-692c-403a-967c-7e015a2e37f6\" 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=\"99\" data-end=\"272\"\u003e\u003cstrong data-start=\"99\" data-end=\"149\"\u003eQ: What sauna size is this stove suitable for?\u003c\/strong\u003e\u003cbr data-start=\"149\" data-end=\"152\"\u003eA: Designed for small to medium saunas, typically up to ~13 m³ (around 459 ft³). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"274\" data-end=\"404\"\u003e\u003cstrong data-start=\"274\" data-end=\"311\"\u003eQ: What type of fuel does it use?\u003c\/strong\u003e\u003cbr data-start=\"311\" data-end=\"314\"\u003eA: It is a wood-burning sauna stove, delivering a traditional, authentic sauna experience.\u003c\/p\u003e\n\u003cp data-start=\"406\" data-end=\"601\"\u003e\u003cstrong data-start=\"406\" data-end=\"447\"\u003eQ: What is the firebox extension for?\u003c\/strong\u003e\u003cbr data-start=\"447\" data-end=\"450\"\u003eA: It allows you to load wood from an adjacent room, improving safety, cleanliness, and convenience during use. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"603\" data-end=\"753\"\u003e\u003cstrong data-start=\"603\" data-end=\"636\"\u003eQ: What is the heating power?\u003c\/strong\u003e\u003cbr data-start=\"636\" data-end=\"639\"\u003eA: It provides 12kW of heat output for efficient and steady sauna warming. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"755\" data-end=\"930\"\u003e\u003cstrong data-start=\"755\" data-end=\"796\"\u003eQ: How does it burn wood efficiently?\u003c\/strong\u003e\u003cbr data-start=\"796\" data-end=\"799\"\u003eA: It uses a top-air combustion system that promotes cleaner burning and reduced emissions. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"932\" data-end=\"1075\"\u003e\u003cstrong data-start=\"932\" data-end=\"966\"\u003eQ: What is the stone capacity?\u003c\/strong\u003e\u003cbr data-start=\"966\" data-end=\"969\"\u003eA: Around 90 kg (≈198 lbs) for smooth, long-lasting steam (löyly). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1077\" data-end=\"1213\"\u003e\u003cstrong data-start=\"1077\" data-end=\"1098\"\u003eQ: Is it durable?\u003c\/strong\u003e\u003cbr data-start=\"1098\" data-end=\"1101\"\u003eA: Yes, built with stainless steel and a cast iron door designed for high heat resistance and long service life.\u003c\/p\u003e\n\u003cp data-start=\"1215\" data-end=\"1357\"\u003e\u003cstrong data-start=\"1215\" data-end=\"1264\"\u003eQ: Does it require professional installation?\u003c\/strong\u003e\u003cbr data-start=\"1264\" data-end=\"1267\"\u003eA: Yes, proper chimney connection and safety clearances require professional installation.\u003c\/p\u003e\n\u003cp data-start=\"1359\" data-end=\"1523\"\u003e\u003cstrong data-start=\"1359\" data-end=\"1412\"\u003eQ: What kind of sauna experience does it deliver?\u003c\/strong\u003e\u003cbr data-start=\"1412\" data-end=\"1415\"\u003eA: A soft yet powerful traditional wood-fired heat with excellent steam quality and steady warmth retention.\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\u003eMaintenance Tips\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:22e58e9c-b724-4c90-b92d-5303ad0b061b-26\" data-testid=\"conversation-turn-6\" 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=\"e181cf96-6181-42ce-9d17-dde53ad4fa19\" 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\" data-turn-start-message=\"true\" 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\u003cul data-start=\"102\" data-end=\"871\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"1wt7xtk\" data-start=\"102\" data-end=\"184\"\u003e\n\u003cstrong data-start=\"104\" data-end=\"132\"\u003eEmpty ash tray regularly\u003c\/strong\u003e to maintain strong airflow and efficient burning.\u003c\/li\u003e\n\u003cli data-section-id=\"kzx7mq\" data-start=\"185\" data-end=\"272\"\u003e\n\u003cstrong data-start=\"187\" data-end=\"226\"\u003eClean firebox and extension chamber\u003c\/strong\u003e after frequent use to prevent soot buildup.\u003c\/li\u003e\n\u003cli data-section-id=\"1fl70k3\" data-start=\"273\" data-end=\"362\"\u003e\n\u003cstrong data-start=\"275\" data-end=\"311\"\u003eInspect firebox extension joints\u003c\/strong\u003e to ensure secure connection and no heat leakage.\u003c\/li\u003e\n\u003cli data-section-id=\"1kehmxy\" data-start=\"363\" data-end=\"448\"\u003e\n\u003cstrong data-start=\"365\" data-end=\"395\"\u003eCheck chimney\/flue monthly\u003c\/strong\u003e and remove creosote for safe, smooth exhaust flow.\u003c\/li\u003e\n\u003cli data-section-id=\"r3lo5z\" data-start=\"449\" data-end=\"522\"\u003e\n\u003cstrong data-start=\"451\" data-end=\"492\"\u003eReplace sauna stones every 2–3 months\u003c\/strong\u003e if cracked or deteriorated.\u003c\/li\u003e\n\u003cli data-section-id=\"d6yumu\" data-start=\"523\" data-end=\"609\"\u003e\n\u003cstrong data-start=\"525\" data-end=\"556\"\u003eKeep air intake vents clear\u003c\/strong\u003e for proper combustion and stable heat performance.\u003c\/li\u003e\n\u003cli data-section-id=\"1mk7agp\" data-start=\"610\" data-end=\"691\"\u003e\n\u003cstrong data-start=\"612\" data-end=\"647\"\u003eUse dry, seasoned firewood only\u003c\/strong\u003e to reduce residue and improve efficiency.\u003c\/li\u003e\n\u003cli data-section-id=\"1hp1lt4\" data-start=\"692\" data-end=\"777\"\u003e\n\u003cstrong data-start=\"694\" data-end=\"735\"\u003eInspect door seals, hinges, and welds\u003c\/strong\u003e periodically for durability and safety.\u003c\/li\u003e\n\u003cli data-section-id=\"1xeeiw6\" data-start=\"778\" data-end=\"871\" data-is-last-node=\"\"\u003e\n\u003cstrong data-start=\"780\" data-end=\"825\"\u003eAnnual professional servicing recommended\u003c\/strong\u003e for long-term safety and optimal performance.\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=\"mt-3 w-full empty:hidden\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","brand":"Harvia","offers":[{"title":"Default Title","offer_id":45598822465727,"sku":"H1012012","price":1587.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0683\/5703\/0079\/files\/Hive8.png?v=1777384080","url":"https:\/\/www.mybackyardzone.com\/products\/huum-hive-heat-ls-12","provider":"Your Outdoor Setup Starts Here","version":"1.0","type":"link"}