{"product_id":"huum-hive-flow-ls-wood-burning-sauna-stove-w-firebox-extension-9-8kw","title":"HUUM HIVE Flow LS Wood-Burning Sauna Stove w\/ Firebox Extension, 9.8kW","description":"\u003cp\u003e\u003c!-- HUUM HIVE Flow LS - Wood-Burning Sauna Stove with Firebox Extension - H1016012 --\u003e\u003c\/p\u003e\n\u003ch2\u003eHUUM HIVE Flow LS Wood-Burning Sauna Stove w\/ Firebox Extension, 9.8kW\u003c\/h2\u003e\n\u003c!-- SKU: H1016012 | HIVE Flow Series | 282-635 cu ft (8-18 m3) | Floor-mounted wood-burning --\u003e\u003c!-- Model: HIVE Flow LS | 9.8kW | Stainless steel body (5mm top \/ 3mm sides) --\u003e\u003c!-- LS = firebox extension through wall | wood loaded from adjacent room or outdoors --\u003e\u003c!-- Glass door faces adjacent room | HUUM HIVE Flow LS 161 lbs \/ 73 kg --\u003e\u003c!-- Patent-pending furnace design: 75% of heat stays in sauna --\u003e\u003c!-- Safety distances from combustible materials: 150mm sides and back \/ 500mm front --\u003e\u003c!-- CO emissions: 346 mg\/m3 | PM: 25 mg\/m3 --\u003e\u003c!-- BImSchV certified (German clean combustion) | CPR certified --\u003e\u003c!-- Steam lasts over 30 minutes after fire is out --\u003e\u003c!-- 330 lbs \/ 150 kg stones required (10 boxes) + optional stone cage adds 77-88 lbs --\u003e\u003c!-- Top or back flue connection | 115mm | 6\" adapter required for North America --\u003e\u003c!-- Max firewood: 11.8\" (300mm) --\u003e\u003c!-- Dimensions: 20.7\"W (530mm) x 29.5\"D (750mm) x 34.8\"H (884mm) --\u003e\u003c!-- Includes: metal grate, heat resistant glove, splints, metal fixing plates x2, ash grate, cleaning hatches x2, ash drawer --\u003e\u003c!-- Pallet delivery - scheduled freight appointment required --\u003e\u003c!-- Designed and made in Estonia by HUUM --\u003e\u003c!-- 5-year limited warranty (excluding elements) --\u003e\u003c!-- Documents: IOM | Warranty | Certificate | Stone Requirements --\u003e\n\u003cstyle\u003e\n  .fl { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; 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}\n    .fl-divider { margin: 1.25rem 0; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"fl\"\u003e\n\u003cdiv class=\"fl-desc\"\u003e\n\u003cp\u003eThe HUUM HIVE Flow LS is a 9.8kW wood-burning sauna stove for rooms from 282 to 635 cubic feet with a firebox extension that passes through the sauna wall for loading from an adjacent room or outdoors. LS identifies the through-wall firebox configuration: the stove body and 330-lb stone cage sit inside the sauna, the firebox bushing extends through the wall, and the glass door faces the adjacent room. Bathers inside the sauna are completely undisturbed throughout the session. The HIVE Flow LS is the larger configuration of the HUUM Flow platform - 9.8kW vs the HIVE Flow Mini's 8.5kW, 330 lbs of stones vs 231 lbs, and a larger room range of 282-635 cu ft vs 212-494 cu ft. Both share the same patent-pending furnace design that retains 75% of firewood heat inside the sauna, produces CO emissions of just 346 mg\/m3 (vs 1,000+ in comparable stoves), achieves particulate matter output of 25 mg\/m3 - the lowest in its category - and achieves safety distances of just 150mm (5.9\") at the sides and back from combustible materials. The HIVE Flow LS weighs 161 lbs (73 kg). Top or back 115mm chimney connection. Max firewood 11.8\" (300mm). BImSchV and CPR certified. 5-year limited warranty (excluding elements). Designed, engineered, and made in Estonia by HUUM.\u003c\/p\u003e\n\u003ch4\u003eLS firebox extension - load from outside, sauna session undisturbed\u003c\/h4\u003e\n\u003cp\u003eThe LS configuration of the HIVE Flow adds a firebox bushing that passes through the sauna wall into an adjacent room or outdoors. Wood is loaded, the fire is managed, and the glass door allows the person in the adjacent space to watch the flames - all from outside the sauna. Bathers inside receive 9.8kW of heat and the steam from 330 lbs of stones without the sauna door opening for firewood at any point in the session. HUUM's own description of the LS model is direct: it allows you to heat the sauna from an adjacent room. The large glass furnace door enhances the cozy ambiance of the adjacent space, letting you enjoy the mesmerizing flames while the sauna warms. For a cabin sauna with a lounge, a sauna building where the fire is managed from outdoors, or any layout where exterior wood loading is operationally preferred, the HIVE Flow LS is the purpose-built configuration.\u003c\/p\u003e\n\u003ch4\u003eFlow furnace - 75% heat retention, lowest emissions in its category\u003c\/h4\u003e\n\u003cp\u003eThe HIVE Flow LS shares the same patent-pending furnace design as the HIVE Flow Mini. Air flows inside the heater in a unique pattern that keeps 75% of the heat generated from burning wood inside the sauna rather than escaping through the chimney. HUUM's own summary of the practical effect: you can enjoy four sessions with the same amount of wood that would typically provide three sauna sessions. CO emissions of 346 mg\/m3 compare to over 1,000 mg\/m3 in comparable stoves. Particulate matter output of 25 mg\/m3 is the lowest in its output category. BImSchV certification (the German clean combustion standard) and CPR certification confirm these are independently verified values, not manufacturer claims. The same Flow furnace design also produces the 150mm (5.9\") safety distances at the sides and back - the heater warms up more evenly across the stove body, allowing snug installation that conventional stoves cannot achieve.\u003c\/p\u003e\n\u003ch4\u003e330 lbs of stones - up to 408 lbs with optional stone cage\u003c\/h4\u003e\n\u003cp\u003eThe HIVE Flow LS holds 330 lbs (150 kg) of sauna stones in its primary stone compartment, and an optional HUUM stone cage accessory (sold separately) adds capacity for a further 77-88 lbs (35-40 kg) of stones for a total of up to 418 lbs (190 kg). HUUM's description of this configuration is straightforward: the large stone volume allows full sauna bathing even over 30 minutes after the fire has died. The 330-lb primary stone load charges thoroughly during the fire - at 9.8kW, the HIVE Flow LS heats faster than the Mini while holding more thermal mass - and the charged stones sustain heat and steam long after the fire burns down. Rounded sauna stones 5-10 cm in diameter are recommended by HUUM for milder steam and better air circulation through the stone mass. Max firewood length is 11.8\" (300mm).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-hook\"\u003e9.8kW wood-burning sauna stove with firebox extension for rooms from 282 to 635 cubic feet. HIVE Flow LS - firebox extends through sauna wall, wood loaded from adjacent room or outdoors. Glass door faces adjacent room. Bathers inside sauna undisturbed. Patent-pending Flow furnace: 75% heat retention - 4 sessions from 3 loads of wood. CO: 346 mg\/m3 (vs 1,000+ in comparable stoves). PM: 25 mg\/m3 - lowest in category. Safety distances: 150mm (5.9\") sides and back - 500mm (19.7\") front from combustible materials. No protective sheath required. 330 lbs stones required (10 boxes, sold separately). Up to 408 lbs with optional stone cage. Steam lasts over 30 min after fire is out. 5mm top \/ 3mm sides stainless steel. Large glass door. Top or back flue - 115mm. Max firewood 11.8\" (300mm). 6\" adapter required for North America (sold separately). Dimensions: 20.7\"W x 29.5\"D x 34.8\"H. 161 lbs. BImSchV certified - CPR certified. Pallet delivery required. 5-year limited warranty (excl. elements). Designed and made in Estonia by HUUM.\u003c\/div\u003e\n\u003cdiv class=\"fl-badges\"\u003e\n\u003cspan class=\"fl-badge\"\u003e9.8 kW\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003e282 to 635 cu ft\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eHIVE Flow LS - firebox extension through sauna wall\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eWood loaded from adjacent room or outdoors\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eGlass door faces adjacent room\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003e75% heat retention - 4 sessions per 3 wood loads\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eCO: 346 mg\/m3 - PM: 25 mg\/m3\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eSafety: 150mm sides and back - no protective sheath\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003e330 lbs stones required (10 boxes)\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eUp to 408 lbs with optional stone cage\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eSteam lasts over 30 min after fire out\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003e5mm top \/ 3mm sides stainless steel\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eLarge glass door\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eTop or back flue - 115mm - 6\" adapter required\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eMax firewood 11.8\" (300mm)\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003e20.7\"W x 29.5\"D x 34.8\"H - 161 lbs\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eBImSchV certified - CPR certified\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003ePallet delivery required\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003e5-year limited warranty (excl. elements)\u003c\/span\u003e \u003cspan class=\"fl-badge\"\u003eDesigned and made in Estonia by HUUM\u003c\/span\u003e\n\u003c\/div\u003e\n\u003chr class=\"fl-divider\"\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"fl-spec-grid\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"fl-spec-block\"\u003e\n\u003ch4\u003ePerformance\u003c\/h4\u003e\n\u003ctable class=\"fl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower output\u003c\/td\u003e\n\u003ctd\u003e9.8 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuel type\u003c\/td\u003e\n\u003ctd\u003eWood - no electricity required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoom volume\u003c\/td\u003e\n\u003ctd\u003e282 to 635 cu ft (8-18 m3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone capacity (primary)\u003c\/td\u003e\n\u003ctd\u003e330 lbs \/ 150 kg (10 boxes) - sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone capacity with cage\u003c\/td\u003e\n\u003ctd\u003eUp to 408 lbs \/ 185 kg (optional stone cage)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax firewood length\u003c\/td\u003e\n\u003ctd\u003e11.8 in (300 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam after fire out\u003c\/td\u003e\n\u003ctd\u003eOver 30 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-spec-block\"\u003e\n\u003ch4\u003eLS firebox extension\u003c\/h4\u003e\n\u003ctable class=\"fl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirebox access\u003c\/td\u003e\n\u003ctd\u003eFrom outside the sauna room via wall bushing extension\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass door faces\u003c\/td\u003e\n\u003ctd\u003eAdjacent room - fire view from outside sauna\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWall requirement\u003c\/td\u003e\n\u003ctd\u003eNon-combustible wall required for bushing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDual-room effect\u003c\/td\u003e\n\u003ctd\u003eSauna heat inside + fire view and warmth outside\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-spec-block\"\u003e\n\u003ch4\u003eFlow furnace efficiency and emissions\u003c\/h4\u003e\n\u003ctable class=\"fl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat retention in sauna\u003c\/td\u003e\n\u003ctd\u003e75% of firewood heat stays in sauna\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSessions per wood load\u003c\/td\u003e\n\u003ctd\u003e4 sessions vs 3 for conventional stoves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCO emissions\u003c\/td\u003e\n\u003ctd\u003e346 mg\/m3 (vs 1,000+ mg\/m3 in comparable stoves)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParticulate matter\u003c\/td\u003e\n\u003ctd\u003e25 mg\/m3 - lowest in its category\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eBImSchV (German clean combustion) | CPR certified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-spec-block\"\u003e\n\u003ch4\u003eSafety distances (combustible materials)\u003c\/h4\u003e\n\u003ctable class=\"fl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSides and back\u003c\/td\u003e\n\u003ctd\u003e5.9 in (150 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront\u003c\/td\u003e\n\u003ctd\u003e19.7 in (500 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVs conventional stoves\u003c\/td\u003e\n\u003ctd\u003eConventional: 200-500 mm | HIVE Flow: 150 mm sides\/back\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtective sheath required\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"fl-spec-block\"\u003e\n\u003ch4\u003ePhysical dimensions\u003c\/h4\u003e\n\u003ctable class=\"fl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e20.7 in (530 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth (with LS extension)\u003c\/td\u003e\n\u003ctd\u003e29.5 in (750 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e34.8 in (884 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (LS model)\u003c\/td\u003e\n\u003ctd\u003e161 lbs (73 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard Flow weight (no LS)\u003c\/td\u003e\n\u003ctd\u003e148 lbs (67 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-spec-block\"\u003e\n\u003ch4\u003eHIVE Flow LS vs HIVE Flow Mini LS comparison\u003c\/h4\u003e\n\u003ctable class=\"fl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003ctd\u003eFlow LS: 9.8kW | Flow Mini LS: 8.5kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoom range\u003c\/td\u003e\n\u003ctd\u003eFlow LS: 282-635 cu ft | Flow Mini LS: 212-494 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone capacity\u003c\/td\u003e\n\u003ctd\u003eFlow LS: 330 lbs (10 boxes) | Flow Mini LS: 231 lbs (7 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003eFlow LS: 20.7 in | Flow Mini LS: 17.7 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow furnace, emissions, clearances\u003c\/td\u003e\n\u003ctd\u003eIdentical - same patent-pending furnace design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications, warranty\u003c\/td\u003e\n\u003ctd\u003eIdentical - BImSchV, CPR, 5-year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-spec-block\"\u003e\n\u003ch4\u003eConstruction\u003c\/h4\u003e\n\u003ctable class=\"fl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTop panels\u003c\/td\u003e\n\u003ctd\u003e5 mm thick stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSides\u003c\/td\u003e\n\u003ctd\u003e3 mm thick stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass door\u003c\/td\u003e\n\u003ctd\u003eLarge - faces adjacent room in LS configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAsh management\u003c\/td\u003e\n\u003ctd\u003eAsh drawer included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCleaning access\u003c\/td\u003e\n\u003ctd\u003e2 cleaning hatches included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eFloor-mounted, vertical orientation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-spec-block\"\u003e\n\u003ch4\u003eFlue, certifications, and optional accessories\u003c\/h4\u003e\n\u003ctable class=\"fl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlue connection diameter\u003c\/td\u003e\n\u003ctd\u003e115mm (4.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlue connection position\u003c\/td\u003e\n\u003ctd\u003eTop or back - selected during installation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNorth American adapter\u003c\/td\u003e\n\u003ctd\u003e6\" (155mm) adapter required - sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eDesigned, engineered, and made in Estonia by HUUM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5-year limited warranty (excluding elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptional cage\u003c\/td\u003e\n\u003ctd\u003eHUUM stone cage - adds 77-88 lbs stones capacity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptional protective cage\u003c\/td\u003e\n\u003ctd\u003eHUUM Cage HSTV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChimney kits\u003c\/td\u003e\n\u003ctd\u003eHUUM Thru-Ceiling \/ Thru-Wall \/ Barrel Chimney Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFloor protection\u003c\/td\u003e\n\u003ctd\u003eHUUM Protective Plate | HUUM Protective Bed LS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"fl-divider\"\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cdiv class=\"fl-inc-grid\"\u003e\n\u003cdiv class=\"fl-inc-item\"\u003eHUUM HIVE Flow LS 9.8kW wood-burning sauna stove with LS firebox extension\u003c\/div\u003e\n\u003cdiv class=\"fl-inc-item\"\u003eMetal grate\u003c\/div\u003e\n\u003cdiv class=\"fl-inc-item\"\u003eHeat resistant glove\u003c\/div\u003e\n\u003cdiv class=\"fl-inc-item\"\u003eSplints\u003c\/div\u003e\n\u003cdiv class=\"fl-inc-item\"\u003eMetal fixing plates (x2)\u003c\/div\u003e\n\u003cdiv class=\"fl-inc-item\"\u003eAsh grate\u003c\/div\u003e\n\u003cdiv class=\"fl-inc-item\"\u003eCleaning hatches (x2)\u003c\/div\u003e\n\u003cdiv class=\"fl-inc-item\"\u003eAsh drawer\u003c\/div\u003e\n\u003cdiv class=\"fl-inc-item\"\u003eInstallation and operation manual\u003c\/div\u003e\n\u003cdiv class=\"fl-inc-item\"\u003e5-year limited warranty (excluding elements)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin-top: 1rem; font-weight: 500; color: #64748b; font-size: 14px;\"\u003e\u003cstrong\u003eRequired (not included):\u003c\/strong\u003e 330 lbs sauna stones (10 boxes, rounded 5-10 cm diameter recommended); 6\" North American flue adapter; chimney connection. \u003cstrong\u003eOptional accessories (sold separately):\u003c\/strong\u003e HUUM stone cage (adds 77-88 lbs additional stone capacity); HUUM Cage HSTV; HUUM Thru-Ceiling, Thru-Wall, or Barrel Chimney Kit; HUUM Protective Plate or Protective Bed LS; HUUM Mounting Collar. A licensed chimney professional is recommended for all flue installations. Non-combustible wall required for LS firebox bushing.\u003c\/p\u003e\n\u003chr class=\"fl-divider\"\u003e\n\u003ch3\u003eWhy the HUUM HIVE Flow LS stands out\u003c\/h3\u003e\n\u003cdiv class=\"fl-feat-grid\"\u003e\n\u003cdiv class=\"fl-feat\"\u003e\n\u003cdiv class=\"fl-feat-title\"\u003eLS exterior loading - session undisturbed, fire managed outside\u003c\/div\u003e\n\u003cp\u003eThe LS firebox extension allows the HIVE Flow's fire to be tended entirely from outside the sauna room. The sauna door stays closed. Heat is not lost to wood loading. Bathers in the sauna are completely undisturbed. The glass door faces the adjacent room, providing the person managing the fire with a direct view of the flames and the ambient warmth of the fire's radiant heat from the firebox face. HUUM notes directly: the LS model allows you to heat the sauna from an adjacent room. For a cabin sauna with a lounge, a sauna building where the stove fire is managed from outdoors, or any layout where exterior loading is operationally preferred, the HIVE Flow LS is the exact configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-feat\"\u003e\n\u003cdiv class=\"fl-feat-title\"\u003e75% heat retention - 4 sessions per 3 wood loads\u003c\/div\u003e\n\u003cp\u003eThe patent-pending Flow furnace keeps 75% of the heat generated from burning wood inside the sauna. HUUM's precise statement of the practical consequence: you can enjoy four sessions with the same amount of wood that would typically provide three sauna sessions. For a sauna that fires regularly across a season of use, this 33% fuel saving adds up meaningfully in wood consumption, cost, and the effort of sourcing and storing firewood. The same Flow furnace design also produces dramatically lower emissions - CO at 346 mg\/m3, particulates at 25 mg\/m3 - as a direct result of the more complete and efficient combustion that the unique airflow pattern achieves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-feat\"\u003e\n\u003cdiv class=\"fl-feat-title\"\u003e330 lbs of stones - over 30 minutes of steam after the fire\u003c\/div\u003e\n\u003cp\u003eAt 330 lbs (150 kg), the HIVE Flow LS holds the largest primary stone capacity in the HUUM HIVE Flow lineup. The large stone mass accumulates substantial thermal energy during the fire and holds it long after the fire dies down. HUUM's own description of the steam performance: full sauna bathing even over 30 minutes after the fire has died. For a sauna session managed from outside via the LS configuration - where the fire is loaded and then left to burn - the stone thermal mass is what sustains the session quality long after the fire itself has burned down. The optional HUUM stone cage adds a further 77-88 lbs of capacity for sessions requiring the maximum stone thermal reserve.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-feat\"\u003e\n\u003cdiv class=\"fl-feat-title\"\u003e5.9\" side and back clearances - snug installation possible\u003c\/div\u003e\n\u003cp\u003eThe HIVE Flow LS requires just 150mm (5.9\") at the sides and back from combustible materials - the same tight clearances as the HIVE Flow Mini, achieved by the same patent-pending furnace design. HUUM attributes the minimal clearances directly to the Flow furnace: the heater warms up more evenly across its body, preventing localised hot spots that would otherwise require larger standoffs from combustible wall surfaces. The front clearance is 500mm (19.7\"). No protective sheath or shield is required to achieve these clearances. For a sauna room where the stove position is close to wooden bench legs and wall panels, 5.9\" side clearances offer significantly more layout flexibility than conventional stoves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-feat\"\u003e\n\u003cdiv class=\"fl-feat-title\"\u003eBImSchV and CPR certified - independently verified emissions\u003c\/div\u003e\n\u003cp\u003eThe HIVE Flow LS meets the BImSchV Stufe 2 standard - the rigorous German clean combustion regulation - and carries CPR (European Commission) certification. These are independently verified emission and performance values, not manufacturer self-declarations. The CO value of 346 mg\/m3 and PM value of 25 mg\/m3 are confirmed by testing under these standards. HUUM states that the HIVE Flow surpasses all known efficiency and environmental metrics for wood-burning stoves of its class. For buyers who require certified emission compliance for installation approval, or who simply want verified evidence of the stove's environmental performance, these certifications are the documented record.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-feat\"\u003e\n\u003cdiv class=\"fl-feat-title\"\u003eHIVE Flow Series - LS and related configurations\u003c\/div\u003e\n\u003cp\u003eThe H1016012 is the 9.8kW LS (firebox extension) configuration of the HIVE Flow platform. The same Flow furnace is available as: HIVE Flow (9.8kW, standard interior firebox, H1015012), HIVE Flow Mini (8.5kW, standard interior firebox, H1015012 variant), and HIVE Flow Mini LS (8.5kW, LS firebox extension, H1017012). All four share the same patent-pending Flow furnace (75% heat retention, CO 346 mg\/m3, PM 25 mg\/m3, 150mm side and back clearances), 5mm\/3mm stainless steel construction, BImSchV and CPR certifications, and 5-year limited warranty. The HIVE Flow and HIVE Flow LS cover the 282-635 cu ft range at 9.8kW. The HIVE Flow Mini and Mini LS cover the 212-494 cu ft range at 8.5kW. Designed and made in Estonia by HUUM. We are an authorized HUUM dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"fl-divider\"\u003e\n\u003ch3\u003eAbout HUUM\u003c\/h3\u003e\n\u003cdiv class=\"fl-brand1\" style=\"text-align: start;\"\u003e\n\u003cimg alt=\"HUUM HIVE Flow LS H1016012 9.8kW wood-burning sauna stove firebox extension 282-635 cu ft 330 lbs stones 75% heat retention\" src=\"https:\/\/mediriser.com\/cdn\/shop\/files\/huum-hive-flow-ls-sauna-stove.jpg?v=1781558174\u0026amp;width=800\" class=\"fl-brand-img\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"fl-brand-tag\"\u003eDesigned in Estonia - BImSchV Certified - HIVE Flow Series - LS Firebox Extension\u003c\/span\u003e\n\u003ch4\u003eHUUM HIVE Flow LS. 9.8kW. 282-635 cu ft. 330 lbs of stones. 75% heat retention. Exterior loading.\u003c\/h4\u003e\n\u003cp\u003eHUUM is an Estonian sauna heater company. The HIVE Flow LS is the 9.8kW through-wall firebox configuration of the HIVE Flow platform - 330 lbs of stones, patent-pending Flow furnace (75% heat retention, CO 346 mg\/m3, PM 25 mg\/m3, 150mm side and back clearances), large glass door facing the adjacent room, and steam that lasts over 30 minutes after the fire dies. BImSchV and CPR certified. 330 lbs stones (10 boxes) and chimney connection required and sold separately. Pallet delivery. We are an authorized HUUM dealer.\u003c\/p\u003e\n\u003cul class=\"fl-check\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e9.8kW wood-burning\u003c\/strong\u003e - 282-635 cu ft - LS firebox extension through sauna wall\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e75% heat retention\u003c\/strong\u003e - CO 346 mg\/m3 - PM 25 mg\/m3 - lowest in category\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e330 lbs stones required (10 boxes)\u003c\/strong\u003e - steam lasts over 30 min after fire\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5.9\" side and back clearances\u003c\/strong\u003e - no protective sheath required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBImSchV + CPR certified\u003c\/strong\u003e - 5-year warranty (excl. elements) - made in Estonia\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-brand2\" style=\"text-align: start;\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"fl-brand-tag\"\u003eHIVE Flow LS vs HIVE Flow Mini LS vs HIVE Wood LS 17 - HUUM exterior-feed stove comparison\u003c\/span\u003e\n\u003ch4\u003eHIVE Flow LS vs HIVE Flow Mini LS vs HIVE Wood LS 17 - choosing the right HUUM exterior-feed stove\u003c\/h4\u003e\n\u003cp\u003eThree HUUM exterior-feed wood-burning stoves serve different room sizes and efficiency priorities. HIVE Flow Mini LS H1017012: 8.5kW, 212-494 cu ft, 231 lbs stones (7 boxes), LS firebox extension, patent-pending Flow furnace (75% heat retention, CO 346 mg\/m3). Right for smaller rooms from 212-494 cu ft where the Flow platform's efficiency and low emissions are the priority alongside exterior loading. HIVE Flow LS H1016012 (this listing): 9.8kW, 282-635 cu ft, 330 lbs stones (10 boxes), LS firebox extension, same Flow furnace. Right when the room is larger (282-635 cu ft) and the additional output and stone mass of the full HIVE Flow are required alongside exterior loading. HIVE Wood LS 17 H1010012: 17kW, 283-565 cu ft, 287 lbs stones (9 boxes), LS firebox extension, HUUM's stone-primary heat philosophy (different furnace approach, 5mm stainless steel flame tamer). Right when higher output (17kW) and the HUUM stone-primary experience are the priorities for a similar room range, with different efficiency and emissions characteristics than the Flow platform. Choose the HIVE Flow LS for the 282-635 cu ft range where 9.8kW Flow furnace efficiency and exterior loading via the LS extension are the right specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"HUUM HIVE Flow LS 9.8kW vs HIVE Flow Mini LS 8.5kW vs HIVE Wood LS 17 17kW exterior-feed wood sauna stove comparison\" src=\"https:\/\/mediriser.com\/cdn\/shop\/files\/huum-hive-flow-sauna-stove-in-use.jpg?v=1781558220\u0026amp;width=800\" class=\"fl-brand-img\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\u003c\/div\u003e\n\u003chr class=\"fl-divider\"\u003e\n\u003ch3\u003eManuals and Documents\u003c\/h3\u003e\n\u003cdiv class=\"fl-manual\"\u003e\n\u003cdiv class=\"fl-manual-item\"\u003e\n\u003ch6\u003eInstallation and Operation Manual\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2025-11\/HUUM-HIVE-Flow-Sauna-Stove-IOM.pdf\" class=\"fl-doc-link\" target=\"_blank\"\u003e \u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"\u003e\u003cpath d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z\"\u003e\u003c\/path\u003e\u003cpolyline points=\"14 2 14 8 20 8\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e Installation and Operation Manual (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-manual-item\"\u003e\n\u003ch6\u003eWarranty\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2025-09\/HUUM-Warranty.pdf\" class=\"fl-doc-link\" target=\"_blank\"\u003e \u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"\u003e\u003cpath d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z\"\u003e\u003c\/path\u003e\u003cpolyline points=\"14 2 14 8 20 8\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e Warranty (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-manual-item\"\u003e\n\u003ch6\u003eCertificate\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2025-12\/HUUM-HIVE-Flow-Sauna-Stove-BImSchV-Certificate.pdf\" class=\"fl-doc-link\" target=\"_blank\"\u003e \u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"\u003e\u003cpath d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z\"\u003e\u003c\/path\u003e\u003cpolyline points=\"14 2 14 8 20 8\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e Certificate (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fl-manual-item\"\u003e\n\u003ch6\u003eStone Requirements\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2025-12\/-HUUM-Stone-Requirements.pdf\" class=\"fl-doc-link\" target=\"_blank\"\u003e \u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"\u003e\u003cpath d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z\"\u003e\u003c\/path\u003e\u003cpolyline points=\"14 2 14 8 20 8\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e Stone Requirements (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cdiv class=\"fl-warranty\"\u003e\n\u003ch5\u003e5-year limited warranty (excluding elements)\u003c\/h5\u003e\n\u003cp\u003eThe HUUM HIVE Flow LS carries HUUM's \u003cstrong\u003e5-year limited warranty\u003c\/strong\u003e from the date of purchase. The warranty covers defects in manufacturing and materials under normal use and maintenance conditions. Heating elements are excluded from the 5-year term and carry a separate warranty period per the warranty document. The warranty does not cover damage caused by improper installation, failure to follow the installation and operating guidelines, use of unsuitable sauna stones (decorative stones in particular must not be used as they can break under heat), operating without the required stone load, or chimney-related damage from inadequate maintenance. The LS firebox bushing must pass through a non-combustible wall as specified in the installation manual. A licensed chimney professional is recommended for all flue installation and regular chimney sweep maintenance. Proof of purchase from an authorized HUUM dealer is required for warranty claims. We are an authorized HUUM dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HUUM","offers":[{"title":"Default Title","offer_id":52358517096730,"sku":"H1016012","price":3221.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/1690\/0634\/files\/huum-hive-flow-ls-sauna-stove.jpg?v=1781558174","url":"https:\/\/mediriser.com\/products\/huum-hive-flow-ls-wood-burning-sauna-stove-w-firebox-extension-9-8kw","provider":"Mediriser","version":"1.0","type":"link"}