{"product_id":"huum-extra-small-3-5-cm-sauna-heater-stones","title":"HUUM Extra Small (3-5 cm) Sauna Heater Stones","description":"\u003c!-- HUUM Sauna Heater Stones - Extra Small (3-5 cm, Stones 12, H3099011) and Small (5-10 cm, Stones 24, H3099021) --\u003e\u003c!-- Rounded olivine diabase | 15 kg (33 lb) per box | Stone count per box not stated | Origin not stated --\u003e\u003c!-- Stones 12 (XS): UPC 4744103018017 (Sauna Marketplace) | Stones 24 (S): UPC not found --\u003e\u003c!-- XS 3-5 cm: CLIFF Mini \/ CLIFF \/ STEEL Mini \/ STEEL | S 5-10 cm: DROP \/ HIVE \/ HIVE Mini \/ HIVE Wood \/ CORE (per huum.eu + dealers) --\u003e\u003c!-- Kg per heater from huum.eu; boxes per heater from dealers (Topture, Sauna Marketplace) - approximate, confirm in heater manual --\u003e\u003c!-- Supplier\/dealers note stones are sold with a heater order only (not stated on description) --\u003e\u003c!-- Documents: huum.eu stone preparation and care guide --\u003e\n\u003cstyle\u003e\n  .cp { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; 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border-radius: 6px; padding: 1.25rem 1.5rem; margin-bottom: 1.5rem; }\n  .cp-manual-item { margin-bottom: 1.25rem; padding-bottom: 1.25rem; border-bottom: 1px solid #e2e8f0; }\n  .cp-manual-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }\n  .cp-manual-item h6 { font-size: 14px; font-weight: 700 !important; color: #0f172a !important; margin: 0 0 0.5rem; }\n  .cp-doc-link { display: inline-flex; align-items: center; gap: 7px; font-size: 14px; font-weight: 500; color: #4a5568; background: #fff; border: 1px solid #d1d5db; border-radius: 5px; padding: 8px 14px; text-decoration: none; max-width: 100%; word-break: break-word; }\n  .cp-doc-link:hover { background: #e8f0fa; border-color: #bfd4ef; color: #2563a8; }\n  .cp-divider { border: none; border-top: 1px solid #e2e8f0; margin: 1.75rem 0; }\n\n  @media (max-width: 768px) {\n    .cp-feat-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }\n    .cp-spec-grid { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }\n    .cp-brand1, .cp-brand2 { grid-template-columns: minmax(0, 1fr); gap: 1rem; padding: 1rem 0; }\n    .cp-brand2 { display: flex; flex-direction: column-reverse; }\n    .cp-brand1 h4, .cp-brand2 h4 { font-size: 18px !important; }\n  }\n\n  @media (max-width: 480px) {\n    .cp { padding: 0; }\n    .cp-feat-grid { grid-template-columns: minmax(0, 1fr); gap: 8px; }\n    .cp-feat { padding: 0.8rem 0.9rem; }\n    .cp-inc-grid { grid-template-columns: minmax(0, 1fr); }\n    .cp-spec-grid { gap: 1.25rem; }\n    .cp-spec-table, .cp-spec-table tbody, .cp-spec-table tr, .cp-spec-table td { display: block; width: 100%; }\n    .cp-spec-table { border: none; }\n    .cp-spec-table tr { border: 1px solid #e2e8f0; border-radius: 6px; margin-bottom: 6px; padding: 8px 12px; background: #fff !important; }\n    .cp-spec-table tr:nth-child(odd) { background: #f8fafc !important; }\n    .cp-spec-table td { border: none; padding: 1px 0; }\n    .cp-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    .cp-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    .cp-divider { margin: 1.25rem 0; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"cp\"\u003e\n\u003cdiv class=\"cp-desc\"\u003e\n\u003ch2 class=\"product-meta__title heading h3\"\u003eHUUM Sauna Heater Stones - Extra Small (3-5 cm) and Small (5-10 cm)\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\u003eHUUM sauna heater stones are rounded olivine diabase stones made to go with HUUM electric heaters and wood-burning stoves. They store heat and make soft steam (löyly) when you pour water on them. HUUM recommends rounded stones for its open-frame heaters because they let the air flow through the stone bed, give milder steam, and heat evenly. Each box holds 15 kg (33 lbs) of stones, and you can choose between two sizes: Extra Small (Stones 12) at 3-5 cm (1-2 in), and Small (Stones 24) at 5-10 cm (2-4 in). The right size depends on your heater, so check the list below or your heater's manual before you order.\u003c\/p\u003e\n\u003ch4\u003eRounded olivine diabase stones\u003c\/h4\u003e\n\u003cp\u003eHUUM describes its stones as made of olivine diabase, an igneous rock with a high thermal capacity that holds up to the extreme temperature swings inside a sauna heater. The rounded shape lets water evaporate gradually, which gives milder steam than sharp-edged stones. The stones are also designed to resist cracking, and the rounded finish suits the clean look of HUUM heaters.\u003c\/p\u003e\n\u003ch4\u003ePick the right size and quantity for your heater\u003c\/h4\u003e\n\u003cp\u003eThe Extra Small 3-5 cm stones are for the CLIFF and STEEL heaters, including their Mini versions. The Small 5-10 cm stones are for the DROP, HIVE, HIVE Mini, CORE, and HIVE Wood stove models. Quantities depend on the heater: for example, HUUM lists about 75 kg (5 boxes) of Extra Small stones for the CLIFF, about 150 kg (10 boxes) of Extra Small stones for the STEEL, and about 55 kg (4 boxes) of Small stones for the DROP. See the tables below for more. These are approximate, so always confirm the stone size and amount in your heater's manual. Please check with us if you are not sure which size your heater takes.\u003c\/p\u003e\n\u003ch4\u003ePreparing and laying the stones\u003c\/h4\u003e\n\u003cp\u003eAccording to HUUM's care guide: wash the stones before first use, because dust from manufacturing and shipping can affect air quality and heater efficiency. Rinse them under running water, and let them dry fully before you place them. Put the larger stones at the bottom for airflow, mixing sizes in layers, and place smaller stones on top for even steam. Do not over-pack the heater, so that air can flow. Before the first real use, heat the stones once to normal sauna temperature and let them cool slowly, without throwing water on them, to protect against thermal shock. Remove and inspect all the stones from time to time, and replace stones that are eroded or noticeably lighter than before. HUUM suggests replacing all stones at the same time. Use natural stones made for sauna heaters, not decorative stones.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cp-hook\"\u003eRounded olivine diabase sauna heater stones for HUUM heaters. Choose Extra Small (3-5 cm, for CLIFF and STEEL) or Small (5-10 cm, for DROP, HIVE, HIVE Mini, CORE and HIVE Wood). 15 kg (33 lbs) per box. Rounded stones give milder steam, high heat capacity, and resist cracking.\u003c\/div\u003e\n\u003cdiv class=\"cp-badges\"\u003e\n\u003cspan class=\"cp-badge\"\u003eRounded olivine diabase\u003c\/span\u003e \u003cspan class=\"cp-badge\"\u003eExtra Small 3-5 cm (1-2 in)\u003c\/span\u003e \u003cspan class=\"cp-badge\"\u003eSmall 5-10 cm (2-4 in)\u003c\/span\u003e \u003cspan class=\"cp-badge\"\u003e15 kg (33 lbs) per box\u003c\/span\u003e \u003cspan class=\"cp-badge\"\u003eMilder steam\u003c\/span\u003e \u003cspan class=\"cp-badge\"\u003eHigh heat capacity\u003c\/span\u003e \u003cspan class=\"cp-badge\"\u003eFor HUUM heaters\u003c\/span\u003e\n\u003c\/div\u003e\n\u003chr class=\"cp-divider\"\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"cp-spec-grid\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"cp-spec-block\"\u003e\n\u003ch4\u003eProduct details\u003c\/h4\u003e\n\u003ctable class=\"cp-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHUUM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003eSauna heater stones\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eRounded olivine diabase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight per box\u003c\/td\u003e\n\u003ctd\u003e15 kg (33 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStones per box\u003c\/td\u003e\n\u003ctd\u003eSold by weight (stone count not stated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cp-spec-block\"\u003e\n\u003ch4\u003eExtra Small - Stones 12\u003c\/h4\u003e\n\u003ctable class=\"cp-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart number \/ SKU\u003c\/td\u003e\n\u003ctd\u003eH3099011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e4744103018017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone size\u003c\/td\u003e\n\u003ctd\u003e3-5 cm (1-2 in), rounded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCLIFF Mini\u003c\/td\u003e\n\u003ctd\u003eAbout 60 kg (4 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCLIFF\u003c\/td\u003e\n\u003ctd\u003eAbout 75 kg (5 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSTEEL Mini\u003c\/td\u003e\n\u003ctd\u003eAbout 60 kg (4 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSTEEL\u003c\/td\u003e\n\u003ctd\u003eAbout 150 kg (10 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cp-spec-block\"\u003e\n\u003ch4\u003eSmall - Stones 24\u003c\/h4\u003e\n\u003ctable class=\"cp-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart number \/ SKU\u003c\/td\u003e\n\u003ctd\u003eH3099021\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone size\u003c\/td\u003e\n\u003ctd\u003e5-10 cm (2-4 in), rounded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDROP\u003c\/td\u003e\n\u003ctd\u003eAbout 55 kg (4 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHIVE Mini\u003c\/td\u003e\n\u003ctd\u003eAbout 150 kg (10 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHIVE\u003c\/td\u003e\n\u003ctd\u003eAbout 250 kg (16 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCORE\u003c\/td\u003e\n\u003ctd\u003eAbout 40 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHIVE Wood 13\u003c\/td\u003e\n\u003ctd\u003eAbout 90 kg (6 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHIVE Wood 17\u003c\/td\u003e\n\u003ctd\u003eAbout 135 kg (9 boxes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cp-spec-block\"\u003e\n\u003ch4\u003eQuantities and care\u003c\/h4\u003e\n\u003ctable class=\"cp-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmounts\u003c\/td\u003e\n\u003ctd\u003eApproximate; confirm in your heater's manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBefore first use\u003c\/td\u003e\n\u003ctd\u003eWash, dry fully, then heat once without water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLaying\u003c\/td\u003e\n\u003ctd\u003eLarger stones at the bottom, smaller on top; do not over-pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplacing\u003c\/td\u003e\n\u003ctd\u003eReplace eroded or lighter stones, ideally all at once\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=\"cp-divider\"\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cdiv class=\"cp-inc-grid\"\u003e\n\u003cdiv class=\"cp-inc-item\"\u003e1 box of rounded olivine diabase stones, 15 kg (33 lbs)\u003c\/div\u003e\n\u003cdiv class=\"cp-inc-item\"\u003eYour choice of size: Extra Small 3-5 cm or Small 5-10 cm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin-top: 1rem; font-weight: 500; color: #64748b; font-size: 14px;\"\u003e\u003cstrong\u003eNot included:\u003c\/strong\u003e the HUUM heater and controller. Order the number of boxes your heater needs, and follow the heater's installation and operation manual.\u003c\/p\u003e\n\u003chr class=\"cp-divider\"\u003e\n\u003ch3\u003eWhy HUUM sauna stones stand out\u003c\/h3\u003e\n\u003cdiv class=\"cp-feat-grid\"\u003e\n\u003cdiv class=\"cp-feat\"\u003e\n\u003cdiv class=\"cp-feat-title\"\u003eMilder, softer steam\u003c\/div\u003e\n\u003cp\u003eThe rounded shape lets water evaporate gradually, which gives the milder steam HUUM recommends for its heaters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cp-feat\"\u003e\n\u003cdiv class=\"cp-feat-title\"\u003eHigh heat capacity\u003c\/div\u003e\n\u003cp\u003eOlivine diabase is an igneous rock that stores a lot of heat and holds up to the extreme temperature swings in a sauna heater.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cp-feat\"\u003e\n\u003cdiv class=\"cp-feat-title\"\u003eResists cracking\u003c\/div\u003e\n\u003cp\u003eThe stones are designed to resist fracturing, which matters because broken pieces can block the heater's air holes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cp-feat\"\u003e\n\u003cdiv class=\"cp-feat-title\"\u003eTwo sizes to match your heater\u003c\/div\u003e\n\u003cp\u003eExtra Small 3-5 cm stones suit the CLIFF and STEEL, and Small 5-10 cm stones suit the DROP, HIVE, HIVE Mini, CORE, and HIVE Wood stoves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cp-feat\"\u003e\n\u003cdiv class=\"cp-feat-title\"\u003eBuilt for open-frame heaters\u003c\/div\u003e\n\u003cp\u003eRound stones let air move through the stone bed in HUUM's open-frame heaters, which gives more even heating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cp-feat\"\u003e\n\u003cdiv class=\"cp-feat-title\"\u003ePacked by weight in 15 kg boxes\u003c\/div\u003e\n\u003cp\u003eEach box holds 15 kg (33 lbs), so it is easy to work out how many boxes your heater needs. We are an authorized HUUM dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"cp-divider\"\u003e\n\u003ch3\u003eAbout HUUM\u003c\/h3\u003e\n\u003cdiv class=\"cp-brand1\" style=\"text-align: start;\"\u003e\n\u003cimg alt=\"HUUM rounded olivine diabase sauna heater stones\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0767\/1690\/0634\/files\/4_web-496x580.jpg?v=1792087984\" class=\"cp-brand-img\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"cp-brand-tag\"\u003eHUUM - Sauna Heater Stones - Extra Small and Small\u003c\/span\u003e\n\u003ch4\u003eHUUM sauna heater stones. Rounded olivine diabase in two sizes.\u003c\/h4\u003e\n\u003cp\u003eHUUM is an Estonian sauna heater brand with a minimalist Nordic design, founded by Siim Nellis, who is the third in his family to build sauna stoves. Its heaters and stoves are made in Estonia from stainless steel and other quality materials, and its products have won international design awards, including the Red Dot Award and the European Product Design Award. HUUM recommends rounded stones for its open-frame heaters because they give milder steam and even heating, and it offers them in 3-5 cm and 5-10 cm sizes in 15 kg boxes. We are an authorized HUUM dealer.\u003c\/p\u003e\n\u003cul class=\"cp-check\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eRounded olivine diabase\u003c\/strong\u003e - 15 kg (33 lbs) per box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtra Small 3-5 cm\u003c\/strong\u003e for CLIFF and STEEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall 5-10 cm\u003c\/strong\u003e for DROP, HIVE, HIVE Mini, CORE and HIVE Wood\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMilder steam\u003c\/strong\u003e and high heat capacity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"cp-divider\"\u003e\n\u003ch3\u003eManuals and Documents\u003c\/h3\u003e\n\u003cdiv class=\"cp-manual\"\u003e\n\u003cdiv class=\"cp-manual-item\"\u003e\n\u003ch6\u003eHow to Prepare and Care for Your Sauna Stones\u003c\/h6\u003e\n\u003ca href=\"https:\/\/huum.eu\/how-to-prepare-and-care-for-your-sauna-stones\" class=\"cp-doc-link\" rel=\"noopener\" 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 HUUM Stone Care Guide (web page) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HUUM","offers":[{"title":"3–5 cm","offer_id":53088910180634,"sku":"H3099011","price":80.0,"currency_code":"USD","in_stock":true},{"title":"5–10 cm","offer_id":53088910213402,"sku":"H3099012","price":80.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/1690\/0634\/files\/clean-stones_0_7d81ee76-03d0-4921-82ac-0efae734f034.jpg?v=1792088189","url":"https:\/\/mediriser.com\/products\/huum-extra-small-3-5-cm-sauna-heater-stones","provider":"Mediriser","version":"1.0","type":"link"}