{"product_id":"harvia-pro-36-duo-wood-sauna-stove-pro-series-31kw","title":"Harvia Pro 36 Duo Wood Sauna Stove Pro Series, 31kW","description":"\u003c!-- Harvia Pro 36 Duo - Pro Series Wood-Burning Sauna Stove\/Fireplace Combo - WKPR36DUOS --\u003e\u003c!-- SKU: WKPR36DUOS | Pro Series | 494-1,271 cu ft | Floor-mounted wood-burning --\u003e\u003c!-- Model: PRO 36 DUO | 31kW | Stainless steel outer shell --\u003e\u003c!-- DUO = wall-embedded glass hatch facing adjacent room | wood and ash from OUTSIDE the sauna --\u003e\u003c!-- Fire creates fireplace atmosphere in adjacent room while heating sauna inside --\u003e\u003c!-- DUO creates more space in the sauna - more bench solution freedom --\u003e\u003c!-- 132.3 lbs AC3020 stones (3 boxes, 10-15 cm) required - sold separately --\u003e\u003c!-- Stainless steel air-flow spoiler for combustion efficiency --\u003e\u003c!-- Top flue connection (115mm) | 6\" adapter required for North America --\u003e\u003c!-- Max firewood: 15.3\" (390mm) | Diameter 3-6\" (80-150mm) --\u003e\u003c!-- Safety distances combustible: front 19.69\" \/ sides 19.69\" \/ back 19.69\" \/ ceiling 4.1 ft --\u003e\u003c!-- Safety distances non-combustible: sides 3.94\" \/ back 3.94\" \/ front 19.69\" --\u003e\u003c!-- Optional: WL550 protective sheath | chimney-mounted water tank --\u003e\u003c!-- Dimensions: 20.08\"W x 31.1\"D x 3.41 ft H | Net weight: 176.4 lbs | Gross: 177.5 lbs --\u003e\u003c!-- NOTE: deeper than PRO 36 (31.1\" vs 20.08\") due to DUO wall extension --\u003e\u003c!-- Pallet delivery - scheduled freight appointment required --\u003e\u003c!-- CE certified | EAC certified | Made in Finland by Harvia --\u003e\u003c!-- 2-year warranty (consumer) --\u003e\u003c!-- Documents: IOM | Data Sheet | Safety Sheet | Declaration of Performance | Stone Requirements | Accessories | Parts --\u003e\n\u003cstyle\u003e\n  .pd { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; 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}\n  }\n  @media (max-width: 480px) {\n    .pd { padding: 0; }\n    .pd-feat-grid { grid-template-columns: 1fr; gap: 8px; }\n    .pd-feat { padding: 0.8rem 0.9rem; }\n    .pd-inc-grid { grid-template-columns: 1fr; }\n    .pd-spec-grid { gap: 1.25rem; }\n    .pd-spec-table, .pd-spec-table tbody, .pd-spec-table tr, .pd-spec-table td { display: block; width: 100%; }\n    .pd-spec-table { border: none; }\n    .pd-spec-table tr { border: 1px solid #e2e8f0; border-radius: 6px; margin-bottom: 6px; padding: 8px 12px; background: #fff !important; }\n    .pd-spec-table tr:nth-child(odd) { background: #f8fafc !important; }\n    .pd-spec-table td { border: none; padding: 1px 0; }\n    .pd-spec-table td:first-child { font-size: 10px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: #64748b; width: 100%; padding-bottom: 2px; }\n    .pd-spec-table td:last-child { font-size: 15px; font-weight: 700 !important; color: #0f172a !important; width: 100%; word-wrap: break-word; overflow-wrap: break-word; }\n    .pd-divider { margin: 1.25rem 0; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"pd\"\u003e\n\u003cdiv class=\"pd-desc\"\u003e\n\u003ch2 class=\"product-meta__title heading h3\"\u003eHarvia Pro 36 Duo Steel Wood-Burning Sauna Stove\u003c\/h2\u003e\n\u003cdiv class=\"@app\"\u003e\n\u003cdiv class=\"shopify-block shopify-app-block\" id=\"shopify-block-AVDBwR2VFTVRTRFphd__a85eace0-7976-4319-9804-004cb28d3e5f\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe Harvia Pro 36 Duo is a 31kW wood-burning sauna stove and fireplace combination for rooms from 494 to 1,271 cubic feet. DUO means the glass hatch is wall-embedded and faces the adjacent room - firewood is loaded from outside the sauna, ash is removed from outside, and the fire burns behind the glass hatch visible from the adjacent space as a working fireplace. Inside the sauna, bathers receive the full 31kW output and the steam from 132.3 lbs of AC3020 stones without the sauna door ever opening. Harvia's description is precise: the fire behind the glass hatch of the wood-burning heater creates the atmosphere of the fireplace in a room next to the sauna and allows you to heat the sauna from outside. The outer shell of the Pro 36 Duo is stainless steel - different from the graphite black exterior of the standard PRO 36. The DUO configuration also creates more space in the sauna room and allows more freedom when choosing sauna bench solutions, since the firebox access and ash removal are handled entirely from the adjacent space. A chimney-mounted water tank can be added separately. Flue: 115mm (4.5\") top connection - a 6\" North American adapter is required and sold separately. 132.3 lbs AC3020 stones (3 boxes, 10-15 cm) required and sold separately. Pallet delivery - scheduled freight appointment required. CE and EAC certified. Made in Finland by Harvia.\u003c\/p\u003e\n\u003ch4\u003eDUO - fireplace in the adjacent room, sauna heat inside, one fire\u003c\/h4\u003e\n\u003cp\u003eThe PRO 36 Duo's defining feature is the same as all Harvia DUO stoves: two simultaneous experiences from a single fire. The glass hatch is wall-embedded and faces the adjacent room - the person in that room sees the live fire behind the glass as a direct fireplace experience and loads the wood from their side. Inside the sauna, bathers receive the 31kW heat output and the steam from a fully charged 132.3-lb stone bed, with the sauna door staying closed and the session uninterrupted throughout. Ash removal is also done from outside the sauna, so the sauna interior stays clean. Harvia adds a specific benefit of the DUO that applies directly to the sauna room design: the DUO heater creates more space in the sauna and allows more freedom when deciding sauna bench solutions. With the firebox and ash box access fully external, the sauna room can be laid out as if the stove has no user-side access requirements at all.\u003c\/p\u003e\n\u003ch4\u003eStainless steel outer shell - different from the standard PRO 36\u003c\/h4\u003e\n\u003cp\u003eThe Pro 36 Duo's outer shell is stainless steel, not the graphite black of the standard PRO 36 (WKPR36M). This is a key visual and material difference between the two models. Stainless steel resists heat discolouration and is easy to clean without special treatment - relevant for the portion of the stove body that is visible in the adjacent room as part of the fireplace presentation. The large steel-framed glass door faces the adjacent room. The fire visible through the glass illuminates the adjacent space with the warm light of a working fire. For a combined sauna and lounge space where the visible side of the stove is the fireplace face in the lounge, the stainless steel finish integrates with a wider range of interior aesthetics than a painted surface would.\u003c\/p\u003e\n\u003ch4\u003e31kW for 494 to 1,271 cu ft - same output and room range as PRO 36, extended depth\u003c\/h4\u003e\n\u003cp\u003eThe Pro 36 Duo shares the complete 31kW output and 494-1,271 cu ft room range of the standard PRO 36 platform. Stone capacity is 132.3 lbs (3 boxes AC3020, 10-15 cm) - same as the standard PRO 36. The safety clearances to combustible materials are 19.69\" on all sides - same as the standard PRO 36. The key dimensional difference is depth: 31.1\" for the DUO vs 20.08\" for the standard PRO 36, due to the wall-penetrating DUO fire chamber extension. The maximum firewood length is 15.3\" (390mm) with a diameter of 3\" to 6\" (80-150mm). Adjustable feet make installation levelling straightforward. A licensed chimney professional is recommended for all flue installations. The wall penetration for the DUO configuration requires correct preparation per the installation manual before delivery.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-hook\"\u003e31kW wood-burning sauna stove and fireplace combo for rooms from 494 to 1,271 cubic feet. PRO 36 DUO - wall-embedded glass hatch faces adjacent room. Firewood loaded from outside, ash removed from outside. Fire creates fireplace atmosphere in adjacent room while sauna bathers enjoy 31kW heat inside. DUO creates more space in sauna - more freedom for bench layouts. No electricity required. Stainless steel outer shell. Large steel-framed glass door faces adjacent room. 132.3 lbs AC3020 stones required (3 boxes, 10-15 cm, sold separately). Safety distances: 19.69\" all sides (combustible). 3.94\" sides and back (non-combustible). Ceiling 4.1 ft. Top flue connection (115mm) - 6\" adapter required for North America (sold separately). Max firewood 15.3\" \/ 3-6\" diameter. Dimensions: 20.08\"W x 31.1\"D x 3.41 ft H. Optional: WL550 protective sheath, chimney-mounted water tank. Pallet delivery - scheduled freight required. 2-year warranty (consumer). CE and EAC certified. Made in Finland by Harvia.\u003c\/div\u003e\n\u003cdiv class=\"pd-badges\"\u003e\n\u003cspan class=\"pd-badge\"\u003e31 kW\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003e494 to 1,271 cu ft\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003ePRO 36 DUO - wall-embedded glass hatch faces adjacent room\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eFirewood and ash handled from outside the sauna\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eFireplace atmosphere in adjacent room\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eDUO creates more sauna space - bench layout freedom\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eStainless steel outer shell\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eLarge steel-framed glass door\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eWood-burning - no electricity required\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003e132.3 lbs AC3020 stones required (3 boxes, 10-15 cm)\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eSafety: 19.69\" all sides (combustible)\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eTop flue connection - 115mm\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003e115mm flue - 6\" adapter required for North America\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eMax firewood 15.3\" \/ 3-6\" diameter\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003e20.08\"W x 31.1\"D x 3.41 ft H\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eWL550 protective sheath compatible\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eChimney-mounted water tank compatible\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003ePallet delivery required\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003e2-year warranty (consumer)\u003c\/span\u003e \u003cspan class=\"pd-badge\"\u003eCE and EAC certified - made in Finland\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-notice-yellow\"\u003e⚠️ \u003cstrong\u003e132.3 lbs AC3020 stones (3 boxes, 10-15 cm) required - not included. 6\" North American flue adapter required - not included. Pallet delivery.\u003c\/strong\u003e Stones and the 6\" adapter must be purchased separately. An additional box of stones is recommended for selection of best-fitting stones. This stove ships by scheduled pallet freight - a delivery appointment is required. At 176.4 lbs net weight, plan for on-site assistance to move the stove from the pallet delivery point to its installation position. The wall penetration for the DUO fire chamber must be correctly prepared per the installation manual before the stove is delivered. A licensed chimney professional is recommended for all flue installations.\u003c\/div\u003e\n\u003cdiv class=\"pd-notice\"\u003eℹ️ \u003cstrong\u003ePRO 36 Duo WKPR36DUOS vs PRO 36 WKPR36M - DUO exterior access vs standard interior access, same 31kW platform.\u003c\/strong\u003e PRO 36 WKPR36M: standard interior-access configuration - firebox and ash box face into the sauna room, wood loaded and ash removed from inside, graphite black exterior, 20.08\" depth. Choose if interior firebox access is acceptable and a fireplace view in an adjacent room is not a goal. PRO 36 Duo WKPR36DUOS (this listing): DUO exterior-access configuration - wall-embedded glass hatch faces adjacent room, firewood and ash handled from outside, stainless steel exterior, 31.1\" depth. More freedom for bench layout in sauna room. Choose if exterior firebox access, undisturbed sauna sessions, and a fireplace experience in an adjacent room are the installation goals. Both share identical output (31kW), room range (494-1,271 cu ft), stone requirement (132.3 lbs, 3 boxes AC3020), safety clearances (19.69\" all sides combustible), and WL550 compatibility.\u003c\/div\u003e\n\u003chr class=\"pd-divider\"\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"pd-spec-grid\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"pd-spec-block\"\u003e\n\u003ch4\u003ePerformance\u003c\/h4\u003e\n\u003ctable class=\"pd-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower output\u003c\/td\u003e\n\u003ctd\u003e31 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\u003e494 to 1,271 cu ft (14-36 m3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone capacity\u003c\/td\u003e\n\u003ctd\u003e132.3 lbs \/ 60 kg (3 boxes AC3020, 10-15 cm) - sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone size\u003c\/td\u003e\n\u003ctd\u003eO 10-15 cm (AC3020)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax firewood length\u003c\/td\u003e\n\u003ctd\u003e15.3 in (390 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirewood diameter\u003c\/td\u003e\n\u003ctd\u003e3 in to 6 in (80-150 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-spec-block\"\u003e\n\u003ch4\u003eDUO configuration\u003c\/h4\u003e\n\u003ctable class=\"pd-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass hatch position\u003c\/td\u003e\n\u003ctd\u003eWall-embedded, faces adjacent room\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirewood loading\u003c\/td\u003e\n\u003ctd\u003eFrom outside the sauna - adjacent room or exterior\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAsh removal\u003c\/td\u003e\n\u003ctd\u003eFrom outside the sauna\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFireplace effect\u003c\/td\u003e\n\u003ctd\u003eFire visible from adjacent room as live fireplace\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSauna space benefit\u003c\/td\u003e\n\u003ctd\u003eMore room and bench layout freedom - no firebox access needed inside\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter shell\u003c\/td\u003e\n\u003ctd\u003eStainless steel (vs graphite black on standard PRO 36)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-spec-block\"\u003e\n\u003ch4\u003eSafety distances (combustible materials)\u003c\/h4\u003e\n\u003ctable class=\"pd-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront\u003c\/td\u003e\n\u003ctd\u003e19.69 in (500 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLeft side\u003c\/td\u003e\n\u003ctd\u003e19.69 in (500 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRight side\u003c\/td\u003e\n\u003ctd\u003e19.69 in (500 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack\u003c\/td\u003e\n\u003ctd\u003e19.69 in (500 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCeiling clearance\u003c\/td\u003e\n\u003ctd\u003e4.1 ft (1,250 mm) above stove top\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSide \/ back (non-combustible)\u003c\/td\u003e\n\u003ctd\u003e3.94 in (100 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront (non-combustible)\u003c\/td\u003e\n\u003ctd\u003e19.69 in (500 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum room ceiling height\u003c\/td\u003e\n\u003ctd\u003e6.56 ft (2,000 mm)\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=\"pd-spec-block\"\u003e\n\u003ch4\u003ePhysical dimensions\u003c\/h4\u003e\n\u003ctable class=\"pd-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e20.08 in (510 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth (extended for DUO wall)\u003c\/td\u003e\n\u003ctd\u003e31.1 in (790 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e3.41 ft (1,040 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (stove only)\u003c\/td\u003e\n\u003ctd\u003e176.4 lbs (80 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross weight (packaged)\u003c\/td\u003e\n\u003ctd\u003e177.5 lbs (80.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-spec-block\"\u003e\n\u003ch4\u003ePRO 36 Duo vs PRO 36 - key differences\u003c\/h4\u003e\n\u003ctable class=\"pd-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirebox access\u003c\/td\u003e\n\u003ctd\u003eDUO: From outside | PRO 36: From inside sauna\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass hatch faces\u003c\/td\u003e\n\u003ctd\u003eDUO: Adjacent room | PRO 36: Into sauna room\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter shell\u003c\/td\u003e\n\u003ctd\u003eDUO: Stainless steel | PRO 36: Graphite black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth\u003c\/td\u003e\n\u003ctd\u003eDUO: 31.1 in | PRO 36: 20.08 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003eDUO: 176.4 lbs | PRO 36: 154.3 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput, room range, stones\u003c\/td\u003e\n\u003ctd\u003eIdentical - 31kW, 494-1,271 cu ft, 132.3 lbs (3 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety distances, flue\u003c\/td\u003e\n\u003ctd\u003eIdentical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-spec-block\"\u003e\n\u003ch4\u003eFlue, certifications, and optional accessories\u003c\/h4\u003e\n\u003ctable class=\"pd-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlue connection diameter\u003c\/td\u003e\n\u003ctd\u003e115mm (4.5\") - standard European\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlue connection position\u003c\/td\u003e\n\u003ctd\u003eTop connection\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\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eCE \/ EAC certified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eMade in Finland by Harvia\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2-year limited (consumer use)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtective sheath\u003c\/td\u003e\n\u003ctd\u003eHarvia WL550 (specific to PRO 36 \/ PRO 36 Duo)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater heater\u003c\/td\u003e\n\u003ctd\u003eChimney-mounted water tank (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDelivery\u003c\/td\u003e\n\u003ctd\u003eScheduled pallet freight - appointment required\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=\"pd-divider\"\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cdiv class=\"pd-inc-grid\"\u003e\n\u003cdiv class=\"pd-inc-item\"\u003eHarvia Pro 36 Duo wood-burning sauna stove with wall-embedded DUO glass hatch\u003c\/div\u003e\n\u003cdiv class=\"pd-inc-item\"\u003eLarge steel-framed glass door\u003c\/div\u003e\n\u003cdiv class=\"pd-inc-item\"\u003eFrame\u003c\/div\u003e\n\u003cdiv class=\"pd-inc-item\"\u003eGrill\u003c\/div\u003e\n\u003cdiv class=\"pd-inc-item\"\u003eAdjustable feet\u003c\/div\u003e\n\u003cdiv class=\"pd-inc-item\"\u003eInstallation and operating instructions\u003c\/div\u003e\n\u003cdiv class=\"pd-inc-item\"\u003e2-year limited warranty (consumer use)\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 132.3 lbs AC3020 stones - 3 boxes, 10-15 cm (additional box recommended); 6\" North American flue adapter (Harvia WZ115155). \u003cstrong\u003eOptional accessories (sold separately):\u003c\/strong\u003e WL550 protective sheath (specific to PRO 36 \/ PRO 36 Duo); chimney-mounted water tank; flue pipe extensions. A licensed chimney professional is recommended for all flue installations. Wall penetration preparation required per installation manual before delivery.\u003c\/p\u003e\n\u003chr class=\"pd-divider\"\u003e\n\u003ch3\u003eWhy the Harvia Pro 36 Duo stands out\u003c\/h3\u003e\n\u003cdiv class=\"pd-feat-grid\"\u003e\n\u003cdiv class=\"pd-feat\"\u003e\n\u003cdiv class=\"pd-feat-title\"\u003eFireplace and sauna - one fire, two rooms\u003c\/div\u003e\n\u003cp\u003eThe PRO 36 Duo creates two simultaneous experiences from a single fire. In the adjacent room: the large steel-framed glass hatch provides a direct view of the burning fire - the warmth, light, and atmosphere of a working fireplace. In the sauna: 31kW of wood heat charges 132.3 lbs of AC3020 stones, producing dense, consistent steam for a large group bathing session. Both experiences run simultaneously from a single fire that is tended entirely from the adjacent room side - no interaction with the sauna interior required from anyone. For a combined sauna and lounge, a cabin with an adjoining relaxation room, or any layout where the fire should be accessible and visible from outside the sauna, the PRO 36 Duo delivers both without compromise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-feat\"\u003e\n\u003cdiv class=\"pd-feat-title\"\u003eMore space in the sauna - more bench layout freedom\u003c\/div\u003e\n\u003cp\u003eHarvia directly identifies this as a benefit of the DUO configuration: the DUO heater creates more space in the sauna and allows more freedom when deciding sauna bench solutions. When the firebox faces into the sauna, a loading space in front of the stove and an approach path must be preserved for wood handling and ash removal. When the firebox faces outside, the sauna-side of the stove has no operational requirements - the wall around the stove can be treated like any other wall surface for bench placement purposes. In a large sauna room from 494 to 1,271 cu ft where optimising bench area is a design priority, the DUO layout directly increases usable bench space.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-feat\"\u003e\n\u003cdiv class=\"pd-feat-title\"\u003eUndisturbed sessions - firewood and ash from outside\u003c\/div\u003e\n\u003cp\u003eLoading wood from outside the sauna room means the firebox can be tended, wood added, and the fire adjusted without opening the sauna door, losing heat, or disturbing the bathing session. Ash removal is equally external - the ash box is accessed from the adjacent room side. In a large sauna serving a group over multiple rounds of bathing, the ability to manage the fire from outside means one person can maintain the fire from the lounge or corridor while bathers inside are in session. Harvia states this benefit plainly: adding firewood from outside the sauna is easy and keeps the sauna room clean.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-feat\"\u003e\n\u003cdiv class=\"pd-feat-title\"\u003e31kW - great baths for a great group\u003c\/div\u003e\n\u003cp\u003eHarvia's own tagline for the PRO 36 platform is direct: great baths for a great group of people. At 31kW for rooms from 494 to 1,271 cu ft, the PRO 36 Duo is positioned for large sauna rooms where the session involves multiple bathers in rounds and the stove must sustain heat and steam throughout. The 132.3-lb stone load accumulates substantial thermal energy during the fire and holds it long after the fire dies down - Harvia notes that even if the fire goes out temporarily, the residual heat from the stones keeps the sauna comfortable. The stainless steel air-flow spoiler built into the PRO 36 platform improves combustion efficiency and heat transfer to the stone mass.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-feat\"\u003e\n\u003cdiv class=\"pd-feat-title\"\u003eStainless steel outer shell - visible in the adjacent room\u003c\/div\u003e\n\u003cp\u003eThe Pro 36 Duo's outer shell is stainless steel - the surface that is visible in the adjacent room as the fireplace face of the stove. Stainless steel is durable, resists heat discolouration over years of use, and is easy to clean and maintain. The large steel-framed glass door is set into the stainless steel front face, presenting the fire clearly and cleanly. For a lounge or relaxation space where the visible side of the stove needs to be presentable and easy to keep in good condition across years of daily use, the stainless steel exterior is the appropriate specification. The WL550 protective sheath (sold separately, specific to PRO 36 and PRO 36 Duo) can be installed to reduce side and back clearances further when the room layout requires it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-feat\"\u003e\n\u003cdiv class=\"pd-feat-title\"\u003ePRO Series DUO platform - Pro 36 Duo and related configurations\u003c\/div\u003e\n\u003cp\u003eThe WKPR36DUOS is the DUO exterior-access configuration of Harvia's PRO 36 platform. The same 31kW platform is available in standard interior-access (PRO 36, WKPR36M). The Pro Series also includes the PRO 20 platform (24.1kW, 283-706 cu ft) in standard (WKPR20M), DUO (PRO 20 Duo), SL exterior-feed (WKPR20SLM), right-side water tank (PRO 20 RS), and left-side water tank (PRO 20 LS) configurations. The chimney-mounted water tank accessory can be added to the PRO 36 Duo for hot water heating simultaneously with the sauna. CE and EAC certified. Made in Finland by Harvia. We are an authorized Harvia dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"pd-divider\"\u003e\n\u003ch3\u003eAbout Harvia\u003c\/h3\u003e\n\u003cdiv style=\"text-align: start;\" class=\"pd-brand1\"\u003e\n\u003cimg style=\"margin-bottom: 16px; float: none;\" alt=\"Harvia Pro 36 Duo WKPR36DUOS 31kW wood-burning sauna stove fireplace combo stainless steel 494-1271 cu ft\" src=\"https:\/\/mediriser.com\/cdn\/shop\/files\/Harvia_36-Duo_Heaters_2-500x500.jpg?v=1781458985\u0026amp;width=800\" class=\"pd-brand-img\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"pd-brand-tag\"\u003eMade in Finland - CE Certified - Pro Series DUO - Stainless Steel\u003c\/span\u003e\n\u003ch4\u003eHarvia Pro 36 Duo. 31kW. 494-1,271 cu ft. DUO - fire loads from outside, fireplace view in adjacent room.\u003c\/h4\u003e\n\u003cp\u003eHarvia is a Finnish sauna and spa company established in 1950. The Pro 36 Duo is the DUO exterior-access configuration of the 31kW PRO 36 platform - a wall-embedded glass hatch facing the adjacent room creates a fireplace experience outside while 31kW heats the sauna inside. Stainless steel outer shell, large steel-framed glass door, firewood and ash handled from outside, more bench layout freedom in the sauna room. 132.3 lbs AC3020 stones (3 boxes) and a 6\" North American flue adapter are required and sold separately. Pallet delivery. We are an authorized Harvia dealer.\u003c\/p\u003e\n\u003cul class=\"pd-check\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e31kW wood-burning\u003c\/strong\u003e - 494-1,271 cu ft - no electricity required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDUO - wall glass hatch faces adjacent room\u003c\/strong\u003e - firewood and ash from outside\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel outer shell\u003c\/strong\u003e - large steel-framed glass door - fireplace atmosphere\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSafety distances: 19.69\" all sides (combustible) - 3.94\" sides\/back (non-combustible)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e132.3 lbs AC3020 stones (3 boxes) required\u003c\/strong\u003e - 6\" adapter required - both sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\" class=\"pd-brand2\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"pd-brand-tag\"\u003ePRO 36 Duo vs PRO 36 vs PRO 20 SL - exterior access stove comparison\u003c\/span\u003e\n\u003ch4\u003ePRO 36 Duo vs PRO 36 vs PRO 20 SL - exterior access vs interior access stove selection\u003c\/h4\u003e\n\u003cp\u003eThree Pro Series configurations are relevant for buyers considering the PRO 36 Duo. PRO 36 WKPR36M: same 31kW platform, interior access - firebox and ash box face into the sauna, graphite black exterior, 20.08\" depth, wood loaded and ash removed from inside. Choose if interior firebox access is acceptable and no fireplace view in an adjacent room is needed. PRO 36 Duo WKPR36DUOS (this listing): 31kW, 494-1,271 cu ft, DUO exterior access, stainless steel exterior, 31.1\" depth, wall glass hatch faces adjacent room, firewood and ash from outside, more bench layout freedom. Choose for the 494-1,271 cu ft range where exterior firebox access, undisturbed sessions, and a fireplace in an adjacent room are the goals. PRO 20 SL WKPR20SLM: 24.1kW, 283-706 cu ft, exterior feed, cast-iron glass door faces adjacent room, 88 lbs stones (2 boxes AC3020), 4\" side clearances. Choose for the 283-706 cu ft room range where 24.1kW and the SL exterior-feed configuration are the right specification, with tighter side clearances than the PRO 36 Duo.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg style=\"margin-bottom: 16px; float: none;\" alt=\"Harvia Pro 36 Duo exterior access vs PRO 36 interior access vs PRO 20 SL smaller room exterior feed comparison\" src=\"https:\/\/mediriser.com\/cdn\/shop\/files\/Harvia_36-Duo_Heaters_4-500x500.jpg?v=1781459076\u0026amp;width=800\" class=\"pd-brand-img\"\u003e\n\u003c\/div\u003e\n\u003chr class=\"pd-divider\"\u003e\n\u003ch3\u003eManuals and Documents\u003c\/h3\u003e\n\u003cdiv class=\"pd-manual\"\u003e\n\u003cdiv class=\"pd-manual-item\"\u003e\n\u003ch6\u003eInstallation and Operation Manual\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2026-06\/Harvia-Pro-Duo-%26-SL-Sauna-Heater-IOM.pdf\" class=\"pd-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=\"pd-manual-item\"\u003e\n\u003ch6\u003eData Sheet\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2026-06\/Harvia-WKPR36DUOS-Sauna-Heater-Data-Sheet.pdf\" class=\"pd-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 Data Sheet (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-manual-item\"\u003e\n\u003ch6\u003eSafety Sheet\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2022-02\/Hariva-PRO36-Safety.pdf\" class=\"pd-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 Safety Sheet (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-manual-item\"\u003e\n\u003ch6\u003eDeclaration of Performance\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2022-02\/Hariva-PRO36-DOP.pdf\" class=\"pd-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 Declaration of Performance (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-manual-item\"\u003e\n\u003ch6\u003eStone Requirements\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2026-02\/Harvia%20Stone%20Requirements%2002.27.25.pdf\" class=\"pd-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\u003cdiv class=\"pd-manual-item\"\u003e\n\u003ch6\u003eAccessories\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2022-02\/Hariva-PRO36-Accessories.pdf\" class=\"pd-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 Accessories (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-manual-item\"\u003e\n\u003ch6\u003eParts\u003c\/h6\u003e\n\u003ca href=\"https:\/\/prod-cms.bathingbrands.com\/sites\/default\/files\/2022-02\/Hariva-PRO36-Spare-Parts.pdf\" class=\"pd-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 Parts (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cdiv class=\"pd-warranty\"\u003e\n\u003ch5\u003e2-year limited warranty (consumer use)\u003c\/h5\u003e\n\u003cp\u003eThe Harvia Pro 36 Duo is covered by Harvia's \u003cstrong\u003e2-year limited warranty\u003c\/strong\u003e from the date of purchase for consumer use. The warranty covers defects in manufacturing and materials under normal use conditions. The warranty does not cover damage caused by improper installation, use of incorrect stone type or size (non-AC3020, or stones outside the 10-15 cm specified diameter range), operating without the required stone load, failure to follow the installation and operating guidelines in the manual, damage from inadequate chimney maintenance, soot fires, or improper wall penetration preparation for the DUO fire chamber configuration. A licensed or certified chimney professional is recommended for all flue installation and regular chimney sweep maintenance. Proof of purchase from an authorized Harvia dealer is required for warranty claims. We are an authorized Harvia dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Harvia","offers":[{"title":"Default Title","offer_id":52352036765978,"sku":"WKPR36DUOS","price":3415.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/1690\/0634\/files\/Harvia_36-Duo_Heaters_2-500x500.jpg?v=1781458985","url":"https:\/\/mediriser.com\/products\/harvia-pro-36-duo-wood-sauna-stove-pro-series-31kw","provider":"Mediriser","version":"1.0","type":"link"}