{"product_id":"harvia-pro-36-duo-31kw-wood-burning-sauna-stove","title":"Harvia Pro 36 DUO 31 kW Wood-Burning Sauna Stove with Fireplace","description":"\u003cp style=\"margin-bottom: 16px;\"\u003e\u003cstrong\u003eThe Harvia Pro 36 DUO is a 31 kW wood-burning sauna stove for rooms of 494–1,271 cubic feet. It takes 132 lb of 10-15cm sauna stones (sold separately), needs no electrical supply, and requires a code-compliant chimney.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eThe Pro is the workhorse of Harvia's wood-burning range: a heavy steel firebox with an open stone bed, built to be specified around the room rather than the other way round. Wood sauna layout is nearly always constrained by something — where the chimney can run, whether you can feed the fire from outside the hot room, whether you need hot wash water without a second heater. Harvia builds this firebox in the configurations that solve those constraints without forcing you to change stove size.\u003c\/p\u003e\n\u003cul style=\"margin-top: 8px; padding-left: 18px;\"\u003e\n\u003cli\u003eSophisticated 2-in-1 design\u003c\/li\u003e\n\u003cli\u003eStainless steel outer casing\u003c\/li\u003e\n\u003cli\u003eLarge steel-framed glass door\u003c\/li\u003e\n\u003cli\u003eFloor model with adjustable feet\u003c\/li\u003e\n\u003cli\u003eDoubles as a fireplace in the adjoining room\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 16px; margin-top: 8px;\"\u003e\n\u003cdiv style=\"flex: 1 1 220px; border: 1px solid #ddd; border-radius: 4px; padding: 12px;\"\u003e\n\u003cstrong\u003eIn the Box\u003c\/strong\u003e\u003cbr\u003eSauna Stove, Adjustable Legs, Stove Door, Ash Box, Installation and Operation Manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eRequired to Operate\u003c\/h2\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eThese are not included. You need them before the sauna will run.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 16px; margin-top: 8px;\"\u003e\n\u003cdiv style=\"flex: 1 1 220px; border: 1px solid #ddd; border-radius: 4px; padding: 12px;\"\u003e\n\u003cstrong\u003eSauna Stones\u003c\/strong\u003e\u003cbr\u003e132 lb — Harvia specifies 3 × 44 lb boxes of Harvia AC3020. Never run the unit empty.\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 220px; border: 1px solid #ddd; border-radius: 4px; padding: 12px;\"\u003e\n\u003cstrong\u003eChimney\u003c\/strong\u003e\u003cbr\u003eA listed, code-compliant chimney system, plus floor protection where the manual or local code requires it.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eHarvia Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eWKPR36DUOS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003ePower Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e31 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eSauna Room Volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e494–1,271 adjusted cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eStone Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e132 lbs (59.9 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eRecommended Stones\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eHarvia AC3020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eColor \/ Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eDimensions (W × D × H)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e20\" (510mm) × 31\" (790mm) × 32\" (810mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eWeight (Empty)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e176.4 lbs (80 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eWeight Loaded with Stones\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eapprox. 308 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eFloor Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eCertification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eCE, EAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2 years (consumer use, +1 year if registered with Harvia); 6 months (commercial use)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eShips\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eLTL freight, curbside\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eMade In\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eFinland\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 0.9em; color: #666; margin-top: 6px;\"\u003eHarvia lists this model with CE, EAC marks. These are the European and Eurasian conformity marks, not a UL or ETL listing for North America — confirm requirements with your building department and insurer.\u003c\/p\u003e\n\u003ch2\u003eSizing\u003c\/h2\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003e\u003cstrong\u003eThe Harvia Pro 36 DUO is rated for 494–1,271 adjusted cubic feet.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eAdjusted cubic feet = width × depth × height in feet, plus 45 cu ft for every square foot of glass, tile, concrete or stone, plus 15 cu ft for every square foot of exposed log wall. A 6 × 7 ft room with a 7 ft ceiling is 294 raw cu ft — add a full-glass door and it becomes 834. Always size to the adjusted number.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f7f7f7; text-align: left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f7f7f7; text-align: left;\"\u003eOutput\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f7f7f7; text-align: left;\"\u003eRoom Volume\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f7f7f7; text-align: left;\"\u003eStones\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003ca href=\"\/products\/harvia-pro-20-24-1kw-wood-burning-sauna-stove\"\u003ePro 20\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e24.1 kW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e283–706 cu ft\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e88 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003ca href=\"\/products\/harvia-pro-20-duo-24-1kw-wood-burning-sauna-stove\"\u003ePro 20 DUO\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e24.1 kW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e282–706 cu ft\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e88 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003ca href=\"\/products\/harvia-pro-20-es-24-1kw-wood-burning-sauna-stove\"\u003ePro 20 ES\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e24.1 kW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e283–706 cu ft\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e88 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003ca href=\"\/products\/harvia-pro-20-ls-24-1kw-wood-burning-sauna-stove\"\u003ePro 20 LS\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e24.1 kW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e283–706 cu ft\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e88 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003ca href=\"\/products\/harvia-pro-20-rs-24-1kw-wood-burning-sauna-stove\"\u003ePro 20 RS\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e24.1 kW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e283–706 cu ft\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e88 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003ca href=\"\/products\/harvia-pro-20-sl-24-1kw-wood-burning-sauna-stove\"\u003ePro 20 SL\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e24.1 kW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e283–706 cu ft\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e88 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003ca href=\"\/products\/harvia-pro-26-26-6kw-wood-burning-sauna-stove\"\u003ePro 26\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e26.6 kW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e353–918 cu ft\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e110 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003ca href=\"\/products\/harvia-pro-36-31kw-wood-burning-sauna-stove\"\u003ePro 36\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e31 kW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e494–1,271 cu ft\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e132 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f7f7f7;\"\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003ePro 36 DUO\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e31 kW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e494–1,271 cu ft\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e132 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin-top: 12px;\"\u003e\u003ca href=\"\/pages\/sauna-heater-size-calculator\"\u003eWork out your room with the sauna heater size calculator\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eInstallation \u0026amp; Use Notes\u003c\/h2\u003e\n\u003cul style=\"margin-top: 8px; padding-left: 18px;\"\u003e\n\u003cli\u003eConfirm the flue diameter and whether your chimney connects top or rear before you order chimney components. This is the most common ordering mistake on wood sauna builds.\u003c\/li\u003e\n\u003cli\u003eHarvia wood stoves use 115 mm (4.5 in) European flue pipe. A North American 6 in chimney needs the Harvia WZ115155 adapter.\u003c\/li\u003e\n\u003cli\u003eA solid-fuel appliance usually needs a permit and an inspection in the US, and your insurer will normally want to see the sign-off.\u003c\/li\u003e\n\u003cli\u003eBurn the stove outdoors or with the room ventilated for the first firing to cure the paint. Load stones loosely by hand and re-stack them once a year.\u003c\/li\u003e\n\u003cli\u003eThis is an LTL freight item. It arrives curbside on a pallet and the carrier calls to book a window — have two people and a pallet jack or dolly ready, and note any damage on the delivery receipt before you sign.\u003c\/li\u003e\n\u003cli\u003eStones ship separately on their own freight because of the weight.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\u003ch3\u003eWill the Harvia Pro 36 DUO connect to a US chimney?\u003c\/h3\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eNot directly. Harvia wood stoves are built with 115 mm (4.5 in) European flue pipe, so a North American 6 in system needs the Harvia WZ115155 adapter. Confirm your flue diameter and whether the connection is top or rear before ordering.\u003c\/p\u003e\n\u003ch3\u003eHow does the Harvia Pro 36 DUO work as a fireplace?\u003c\/h3\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eThe DUO firebox passes through the sauna wall, heating the sauna on one side while presenting an open fire view to the adjoining room.\u003c\/p\u003e\n\u003ch3\u003eHow long does the Harvia Pro 36 DUO take to heat up?\u003c\/h3\u003e\n\u003cp style=\"margin-bottom: 16px;\"\u003eHarvia does not publish a figure. As a rule of thumb a correctly sized, well-insulated room with a full stone charge is ready 45 to 75 minutes after lighting, and the stones keep giving heat back long after the fire dies down.\u003c\/p\u003e\n\u003ch2\u003eDownloads\u003c\/h2\u003e\n\u003cdiv style=\"padding: 6px 0; display: flex; flex-direction: column; gap: 8px;\"\u003e\n\u003cdiv style=\"display: flex; align-items: center;\"\u003e\n\u003cimg style=\"width: 20px; height: 20px; margin-right: 8px;\" alt=\"Download Icon\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0903\/2666\/3539\/files\/Icons-10.png?v=1753874853\"\u003e \u003ca rel=\"noopener\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0903\/2666\/3539\/files\/Harvia_Wood-Burning_Sauna_Stove_IOM.pdf?v=1786565109\" target=\"_blank\"\u003eInstallation \u0026amp; Operation Manual\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; align-items: center;\"\u003e\n\u003cimg style=\"width: 20px; height: 20px; margin-right: 8px;\" alt=\"Download Icon\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0903\/2666\/3539\/files\/Icons-10.png?v=1753874853\"\u003e \u003ca rel=\"noopener\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0903\/2666\/3539\/files\/Harvia-WKPR36DUOS-Sauna-Heater-Data-Sheet.pdf?v=1786565106\" target=\"_blank\"\u003eTechnical Data Sheet\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; align-items: center;\"\u003e\n\u003cimg style=\"width: 20px; height: 20px; margin-right: 8px;\" alt=\"Download Icon\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0903\/2666\/3539\/files\/Icons-10.png?v=1753874853\"\u003e \u003ca rel=\"noopener\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0903\/2666\/3539\/files\/Harvia-Warranty-11-2025.pdf?v=1786565109\" target=\"_blank\"\u003eWarranty Statement\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Harvia","offers":[{"title":"Default Title","offer_id":63955123634547,"sku":"WKPR36DUOS","price":3415.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0903\/2666\/3539\/files\/Harvia_Pro20-36Duo_WK200SLUX_WK360SLUX_p1.webp?v=1786565469","url":"https:\/\/allseasonpatio.com\/products\/harvia-pro-36-duo-31kw-wood-burning-sauna-stove","provider":"All Season Patio Company","version":"1.0","type":"link"}