{"product_id":"harvia-black-vulcanite-sauna-stones","title":"Harvia Black Vulcanite Sauna Heater Stones | AC3040 AC3045","description":"\u003cstyle\u003e\n.rca-pdp{font-family:Arial,sans-serif;font-size:15px;line-height:1.7;color:#232323;width:100%;max-width:100%;margin:0;padding:0;box-sizing:border-box}\n.rca-pdp *{box-sizing:border-box;max-width:100%}\n.rca-pdp h2{font-size:22px;font-weight:bold;color:#232323;margin:0 0 12px;line-height:1.3}\n.rca-pdp h3{font-size:18px;font-weight:bold;color:#232323;margin:28px 0 12px}\n.rca-pdp p{margin:0 0 20px}\n.rca-pdp ul,.rca-pdp ol{margin:0 0 28px;padding-left:20px;line-height:1.7;color:#232323}\n.rca-pdp li{margin-bottom:8px}\n.rca-pdp a{color:#323f4e;text-decoration:underline;text-underline-offset:2px}\n.rca-pdp .rca-note{font-size:14px;color:#3F7276;margin-bottom:16px}\n.rca-pdp .rca-flex{display:flex;gap:16px;margin-bottom:28px;flex-wrap:wrap}\n.rca-pdp .rca-box{flex:1 1 260px;min-width:0;border-radius:6px;padding:16px}\n.rca-pdp .rca-box ul{margin:0;padding-left:20px}\n.rca-pdp .rca-best{background:#E8F5E9;border-left:4px solid #4CAF50}\n.rca-pdp .rca-not{background:#FFEBEE;border-left:4px solid #EF5350}\n.rca-pdp .rca-why{background:#E8F4F8;border-left:4px solid #539499;border-radius:6px;padding:16px;margin-bottom:28px}\n.rca-pdp .rca-warn{background:#FFF8E1;border-left:4px solid #F5C842;border-radius:6px;padding:16px;margin-bottom:28px}\n.rca-pdp .rca-req{background:#F5F5F5;border-left:4px solid #CCCCCC;border-radius:6px;padding:16px;margin-bottom:28px}\n.rca-pdp .rca-label{margin:0 0 6px;font-size:13px;font-weight:bold;text-transform:uppercase;letter-spacing:.5px;color:#232323}\n.rca-pdp table{border-collapse:collapse;width:100%;margin-bottom:16px}\n.rca-pdp caption{text-align:left;font-size:14px;color:#3F7276;padding-bottom:8px}\n.rca-pdp th{background:#3F7276;color:#fff;font-weight:bold;padding:10px 12px;text-align:left;font-size:14px}\n.rca-pdp td{padding:10px 12px;border-bottom:1px solid #e5e5e5;color:#232323;vertical-align:top}\n.rca-pdp tbody tr:nth-child(odd){background:#F9F9F9}\n.rca-pdp .rca-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}\n.rca-pdp .rca-swipe{display:none}\n.rca-pdp details{margin-bottom:12px;border-bottom:1px solid #e5e5e5;padding-bottom:12px}\n.rca-pdp summary{font-weight:bold;cursor:pointer;color:#232323;padding:12px 0;min-height:44px;line-height:1.4}\n.rca-pdp details p{padding:10px 0 4px;margin:0}\n@media (max-width:640px){\n.rca-pdp{font-size:16px;padding:0 12px}\n.rca-pdp h2{font-size:20px;line-height:1.35}\n.rca-pdp h3{font-size:17px}\n.rca-pdp .rca-box{min-width:100%}\n.rca-pdp table{font-size:13px}\n.rca-pdp th{padding:8px 6px;font-size:12px;line-height:1.3}\n.rca-pdp td{padding:8px 6px;line-height:1.4;overflow-wrap:anywhere}\n.rca-pdp td:first-child{font-weight:bold}\n.rca-pdp .rca-wide{min-width:640px}\n.rca-pdp .rca-swipe{display:block;font-size:12px;color:#3F7276;margin-bottom:16px}\n}\n\u003c\/style\u003e\n\u003cdiv class=\"rca-pdp\"\u003e\n\n\n\u003ch2\u003eHarvia Black Vulcanite Sauna Stones: volcanic rock for a darker stone bed\u003c\/h2\u003e\n\n\u003cp\u003eOlivine diabase is the default Harvia stone and it is grey. Vulcanite is the alternative: a dark grey volcanic rock roughly two billion years old, split-face like the standard stone but noticeably darker in the basket. It comes in two sizes, the AC3040 at 5 to 10 cm and the AC3045 at 10 to 15 cm, both in 20 kg boxes. Function is the same as any split-face stone; the difference is how the heater looks with the lid off.\u003c\/p\u003e\n\n\u003ch3\u003eWhich size your heater takes\u003c\/h3\u003e\n\n\u003cp\u003eStone size is set by the heater, not by preference. The AC3040 at 5 to 10 cm suits electric heaters, and Harvia also lists it as a top stone for wood-burning heaters. The AC3045 at 10 to 15 cm suits large electric heaters and all wood burners. Check your heater manual for the size it specifies before ordering, because a stone that is too small packs tight and chokes the airflow the elements need.\u003c\/p\u003e\n\n\u003cdiv class=\"rca-warn\"\u003e\n\u003ch4 class=\"rca-label\"\u003eBEFORE YOU ORDER: CHECK YOUR HEATER ACCEPTS SPLIT-FACE STONE\u003c\/h4\u003e\n\u003cp style=\"margin:0;\"\u003eBoth of these are split-face, which Harvia states in its own copy. Some Harvia heaters do not allow split-face stone at all. The Spirit range is the one to watch: its manual states that only rounded stones may be used and that stones with a cleavage surface are not allowed, which rules Vulcanite out entirely. If you own a Spirit you need the rounded R-991 instead. Rinse the dust off before stacking, stack loosely so air can move, and never wedge a stone between heating elements.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eBenefits and Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDark grey volcanic rock, visibly darker than standard olivine diabase\u003c\/li\u003e\n\u003cli\u003eSplit-face, so water meets a broad fractured surface\u003c\/li\u003e\n\u003cli\u003eAC3040 at 5 to 10 cm and AC3045 at 10 to 15 cm\u003c\/li\u003e\n\u003cli\u003e20 kg boxes on both sizes\u003c\/li\u003e\n\u003cli\u003eSuits electric heaters and wood burners depending on size\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"rca-flex\"\u003e\n\u003cdiv class=\"rca-box rca-best\"\u003e\n\u003cp class=\"rca-label\"\u003eBEST FOR\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners who want a darker stone bed than grey olivine gives\u003c\/li\u003e\n\u003cli\u003eReplacing stones that have started to crumble\u003c\/li\u003e\n\u003cli\u003eWood burners, using the larger AC3045\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rca-box rca-not\"\u003e\n\u003cp class=\"rca-label\"\u003eNOT IDEAL FOR\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe Harvia Spirit range, which requires rounded stone\u003c\/li\u003e\n\u003cli\u003eAny heater whose manual specifies rounded stone only\u003c\/li\u003e\n\u003cli\u003eUsing a size your heater manual does not call for\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cp class=\"rca-swipe\"\u003eSwipe to see the full table\u003c\/p\u003e\n\u003cdiv class=\"rca-scroll\" tabindex=\"0\" role=\"region\" aria-label=\"Harvia Black Vulcanite Sauna Heater Stones | AC3040 AC3045 specifications\"\u003e\n\u003ctable class=\"rca-wide\"\u003e\n\u003ccaption\u003eHarvia Black Vulcanite sauna stones. Stone type, size and box weight are from Harvia's model pages. Harvia publishes no certification for either size.\u003c\/caption\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePart\u003c\/th\u003e\n\u003cth\u003eStone size\u003c\/th\u003e\n\u003cth\u003eBox weight\u003c\/th\u003e\n\u003cth\u003eSuits\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC3040\u003c\/td\u003e\n\u003ctd\u003e5 to 10 cm\u003c\/td\u003e\n\u003ctd\u003e20 kg\u003c\/td\u003e\n\u003ctd\u003eElectric heaters, top stone for wood burners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC3045\u003c\/td\u003e\n\u003ctd\u003e10 to 15 cm\u003c\/td\u003e\n\u003ctd\u003e20 kg\u003c\/td\u003e\n\u003ctd\u003eLarge electric heaters and all wood burners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eAlso Consider\u003c\/h3\u003e\n\u003cp\u003eIf your heater requires rounded stone, see the Harvia rounded olivine sauna stones. For a heavy-duty stone built for public saunas, see the Harvia Elite Pro range. For the heaters, see our \u003ca href=\"\/collections\/stoves-and-heaters\"\u003esauna heaters\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eWhy buy this from RecovAthlete\u003c\/h3\u003e\n\u003cdiv class=\"rca-why\"\u003e\n\u003cp style=\"margin:0;\"\u003eStone is the one part of a sauna order people get wrong most often, because the size and the type are both set by the heater and neither is obvious. Tell us your heater model and we will tell you the size, the type and the box count. Call 866-861-6317, 9am to 6pm EST, Monday to Friday, or \u003ca href=\"https:\/\/calendly.com\/recvoathlete\/30min\"\u003ebook a call\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eQuestions buyers ask\u003c\/h3\u003e\n\n\u003cdetails\u003e\u003csummary\u003eCan I use Vulcanite in a Harvia Spirit?\u003c\/summary\u003e\n\u003cp\u003eNo. The Spirit manual states that only rounded stones may be used and that stones with a cleavage surface are not allowed. Vulcanite is split-face, so use the rounded R-991 instead.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003cdetails\u003e\u003csummary\u003eHow many boxes do I need?\u003c\/summary\u003e\n\u003cp\u003eDivide your heater stone capacity by 20 kg and round up. Tell us the model and we will do it for you.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003cdetails\u003e\u003csummary\u003eHow often should stones be replaced?\u003c\/summary\u003e\n\u003cp\u003eHarvia advises rearranging them at least once a year and replacing them annually. Knock two together, and if they crack or sound hollow they are done.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Harvia","offers":[{"title":"AC3040 | Black Vulcanite | 5 to 10 cm | 20 kg box","offer_id":49731342893208,"sku":"AC3040","price":72.0,"currency_code":"USD","in_stock":true},{"title":"AC3045 | Black Vulcanite | 10 to 15 cm | 20 kg box","offer_id":49731342925976,"sku":"AC3045","price":72.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0422\/3942\/6712\/files\/2895.jpg?v=1787500250","url":"https:\/\/recovathlete.com\/products\/harvia-black-vulcanite-sauna-stones","provider":"RecovAthlete","version":"1.0","type":"link"}