{"product_id":"huum-cliff-9-cliff-series-9kw-sauna-heater","title":"HUUM CLIFF 9 CLIFF Series 9kW Sauna Heater","description":"\u003c!-- HUUM CLIFF 9 - 9kW Electric Sauna Heater --\u003e\u003c!-- CLIFF Series | 240V\/1PH | 283-460 cu ft --\u003e\u003c!-- No dimension image needed - heater product description only --\u003e\n\u003cstyle\u003e\n  .sl { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: #1a2a3a; max-width: 900px; margin: 0 auto; line-height: 1.6; }\n  .sl * { box-sizing: border-box; }\n  .sl h4 { font-weight: 700 !important; color: #0f172a !important; margin: 1.5rem 0 0.5rem; line-height: 1.3; }\n  .sl h5 { font-weight: 700 !important; color: #0f172a !important; margin: 0 0 0.5rem; line-height: 1.3; }\n  .sl-hook { font-weight: 500 !important; line-height: 1.75 !important; color: #0f172a !important; padding: 1.1rem 1.4rem; background: #e8f0fa; border-left: 3px solid #2563a8; border-radius: 0 6px 6px 0; margin: 1.5rem 0; }\n  .sl-badges { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 1.75rem; }\n  .sl-badge { background: #e8f0fa; color: #2563a8; font-size: 12px; font-weight: 600; padding: 5px 11px; border-radius: 4px; border: 1px solid #bfd4ef; white-space: nowrap; }\n  .sl-desc p { font-weight: 500 !important; line-height: 1.75 !important; color: #0f172a !important; margin: 0 0 1rem; }\n  .sl-desc p:last-child { margin: 0; }\n  .sl-spec-table { width: 100%; border-collapse: collapse; font-size: 15px; }\n  .sl-spec-table tr:nth-child(odd) { background: #f8fafc; }\n  .sl-spec-table td { padding: 9px 12px; border: 1px solid #e2e8f0; vertical-align: top; }\n  .sl-spec-table td:first-child { color: #64748b; width: 52%; }\n  .sl-spec-table td:last-child { font-weight: 700 !important; color: #0f172a !important; }\n  .sl-spec-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; align-items: start; }\n  .sl-spec-tables { min-width: 0; }\n  .sl-spec-image { min-width: 0; }\n  .sl-spec-block { margin-bottom: 1.5rem; }\n  .sl-spec-block h4 { font-size: 16px; 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width: 7px; height: 7px; border-radius: 50%; background: #2563a8; flex-shrink: 0; }\n  .sl-feat p { font-weight: 500 !important; color: #0f172a !important; line-height: 1.6 !important; margin: 0; font-size: 14px; }\n  .sl-brand1, .sl-brand2 { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; padding: 1.5rem 0; }\n  .sl-brand-img { width: 100%; height: auto; border-radius: 8px; display: block; }\n  .sl-brand-tag { display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 0.09em; text-transform: uppercase; color: #2563a8; background: #e8f0fa; border: 1px solid #bfd4ef; border-radius: 4px; padding: 4px 10px; margin-bottom: 0.75rem; }\n  .sl-brand1 h4, .sl-brand2 h4 { font-size: 22px !important; font-weight: 700 !important; color: #0f172a !important; margin: 0 0 0.75rem; line-height: 1.3 !important; }\n  .sl-brand1 p, .sl-brand2 p { font-weight: 500 !important; line-height: 1.75 !important; color: #0f172a !important; margin: 0 0 0.9rem; }\n  .sl-brand1 p:last-child, .sl-brand2 p:last-child { margin: 0; }\n  .sl-check { list-style: none; padding: 0; margin: 1rem 0 0; }\n  .sl-check li { font-weight: 500 !important; line-height: 1.6 !important; color: #0f172a !important; padding: 10px 0 10px 22px; position: relative; border-bottom: 1px solid #e2e8f0; }\n  .sl-check li:last-child { border-bottom: none; }\n  .sl-check li::before { content: \"\"; position: absolute; left: 4px; top: 16px; width: 7px; height: 7px; border-radius: 50%; background: #2563a8; }\n  .sl-check li strong { color: #0f172a !important; font-weight: 700; }\n  .sl-notice { background: #eff6ff; border: 1px solid #bfd4ef; border-radius: 6px; padding: 0.9rem 1.1rem; margin-bottom: 1.5rem; font-weight: 500 !important; color: #1e3a5f !important; line-height: 1.6 !important; font-size: 14px; }\n  .sl-notice-green { background: #f0fdf4; border: 1px solid #86efac; border-radius: 6px; padding: 0.9rem 1.1rem; margin-bottom: 1.5rem; font-weight: 500 !important; color: #14532d !important; line-height: 1.6 !important; font-size: 14px; }\n  .sl-warranty { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 6px; padding: 1.25rem 1.5rem; }\n  .sl-warranty p { font-weight: 500 !important; color: #0f172a !important; line-height: 1.7 !important; margin: 0; }\n  .sl-manual { background: #fff; border: 1px solid #e2e8f0; border-radius: 6px; padding: 1.25rem 1.5rem; margin-bottom: 1.5rem; }\n  .sl-manual p { font-weight: 500 !important; color: #0f172a !important; line-height: 1.7 !important; margin: 0 0 1rem; }\n  .sl-manual h6 { font-size: 13px; font-weight: 700 !important; color: #64748b !important; margin: 1.25rem 0 0.5rem; text-transform: uppercase; letter-spacing: 0.05em; }\n  .sl-manual h6:first-child { margin-top: 0; }\n  .sl-doc-links { display: flex; flex-wrap: wrap; gap: 10px; }\n  .sl-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; }\n  .sl-doc-link:hover { background: #e8f0fa; border-color: #bfd4ef; color: #2563a8; }\n  .sl-divider { border: none; border-top: 1px solid #e2e8f0; margin: 1.75rem 0; }\n  @media (max-width: 768px) {\n    .sl-feat-grid { grid-template-columns: 1fr 1fr; }\n    .sl-spec-grid { grid-template-columns: 1fr; gap: 1.5rem; }\n    .sl-brand1, .sl-brand2 { grid-template-columns: 1fr; gap: 1rem; padding: 1rem 0; }\n    .sl-brand2 { display: flex; flex-direction: column-reverse; }\n    .sl-brand1 h4, .sl-brand2 h4 { font-size: 18px !important; }\n  }\n  @media (max-width: 480px) {\n    .sl { padding: 0; }\n    .sl-feat-grid { grid-template-columns: 1fr; gap: 8px; }\n    .sl-feat { padding: 0.8rem 0.9rem; }\n    .sl-inc-grid { grid-template-columns: 1fr; }\n    .sl-spec-grid { gap: 1.25rem; }\n    .sl-spec-table, .sl-spec-table tbody, .sl-spec-table tr, .sl-spec-table td { display: block; width: 100%; }\n    .sl-spec-table { border: none; }\n    .sl-spec-table tr { border: 1px solid #e2e8f0; border-radius: 6px; margin-bottom: 6px; padding: 8px 12px; background: #fff !important; }\n    .sl-spec-table tr:nth-child(odd) { background: #f8fafc !important; }\n    .sl-spec-table td { border: none; padding: 1px 0; }\n    .sl-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    .sl-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    .sl-divider { margin: 1.25rem 0; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"sl\"\u003e\n\u003cdiv class=\"sl-desc\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"layout-stack\"\u003e\n\u003ch2 class=\"element-text element-text--heading-xl\"\u003eHuum Cliff sauna heater\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe HUUM CLIFF 9 is a 9kW floor-mounted electric sauna heater engineered for a specific problem: how do you put a high-capacity heater in a sauna where wall space is tight? The CLIFF's answer is geometry. Where most sauna heaters are wide, boxy units that demand significant clearance from the surrounding walls, the CLIFF is a slim vertical tower - 10.6 inches wide, 10.6 inches deep, and 38.4 inches tall - that requires only 9.45 inches of clearance from walls on the 9kW model. This makes it the logical choice for compact sauna cabins, corner installations, and any room where a conventional heater would compromise bench space or create awkward layout constraints. Despite its slim profile, the CLIFF 9 holds 165 lbs of sauna stones - a generous load that produces the soft, sustained steam that is the mark of a properly loaded sauna heater.\u003c\/p\u003e\n\u003ch4\u003eThe internal air duct system - 25% faster heating\u003c\/h4\u003e\n\u003cp\u003eThe CLIFF's slim profile is made possible by an internal air duct system that serves a dual purpose: it is the structural reason the safety distances are reduced, and it is also the mechanism that makes the heater up to 25% faster at reaching temperature than a conventional heater of equivalent power. The air duct draws cool air from the base of the heater, channels it up through the core, and releases it through the top and sides - creating continuous air circulation through the stone mass rather than relying on passive convection alone. This forced internal circulation means the stones heat more evenly from base to top, that the temperature equilibrium inside the heater is reached faster, and that the surrounding wall materials are actively cooled by the moving air rather than receiving static radiant heat. The result is a heater that is simultaneously faster, safer, and more space-efficient than standard electric sauna heaters.\u003c\/p\u003e\n\u003ch4\u003e165 lbs of stone capacity - soft, long-lasting steam\u003c\/h4\u003e\n\u003cp\u003eThe CLIFF 9 holds up to 165 lbs of sauna stones. This is a substantial stone load - significantly more than many compact heaters of comparable footprint - and it is the primary reason the CLIFF produces the soft, gentle, long-lasting steam that sauna enthusiasts associate with wood-fired heating. Large stone mass stores more thermal energy, releases it more slowly, and absorbs more water per ladle without producing the sharp steam burst that an under-stoned heater creates. HUUM designs the CLIFF so that the stones are in direct contact with the heating elements - rather than surrounding a separate heated core - maximising the proportion of heat that transfers directly to the stones rather than radiating from metal surfaces. Five boxes of HUUM CLIFF-compatible stones (33 lbs each, 165 lbs total) are required for proper operation and to maintain warranty coverage; they are sold separately. HUUM recommends rounded olivine-diabase stones in 5-10cm size for the best steam quality and durability.\u003c\/p\u003e\n\u003ch4\u003eRed Dot Award design, SGS certified, 230°F maximum\u003c\/h4\u003e\n\u003cp\u003eThe CLIFF received the internationally recognised Red Dot Product Design Award - a recognition of both its aesthetic quality and its engineering innovation. The natural stone surface surrounds the heater on all sides, making it visually resolved from every angle in the sauna room rather than presenting a visible metal housing. The CLIFF is SGS certified (rather than UL listed), which is relevant to the temperature it can reach: SGS standards allow the heater to achieve up to 230°F, compared to the 194°F ceiling imposed on UL-listed heaters. In practice this means the CLIFF can bring a properly sized sauna room to the high temperatures associated with Finnish sauna tradition - temperatures that UL-listed heaters physically cannot reach. The CLIFF operates on a 240V\/1-phase circuit, requires a 50A breaker, and uses 8 AWG wire. A HUUM UKU control unit is required for operation and is sold separately in Local, Wi-Fi, or Glass Wi-Fi configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-hook\"\u003e9kW slim floor-mounted electric sauna heater for rooms from 283 to 460 cubic feet. 10.6\"W x 10.6\"D x 38.4\"H. 35.2 lbs heater weight. 165 lbs stone capacity (5 boxes, sold separately). Internal air duct system - heats up to 25% faster than conventional heaters. Wall safety distance 9.45\" (24 cm). Stones in direct contact with heating elements. Removable ribs and prop blocks for precise stone stacking. Premium stainless steel construction with industrial-grade heating elements. SGS certified - maximum 230°F. Red Dot Award winner. 240V \/ 1-phase, 37.5A, 50A breaker, 8 AWG wire. UKU control sold separately (Local, Wi-Fi, or Glass). Stones sold separately. Optional safety railing and reflector panel available. 5-year warranty. Made in Estonia by HUUM.\u003c\/div\u003e\n\u003cdiv class=\"sl-badges\"\u003e\n\u003cspan class=\"sl-badge\"\u003e9 kW\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003e283 to 460 cu ft\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003e165 lbs stone capacity\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eHeats 25% faster - internal air duct\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003e9.45\" wall safety distance\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eSlim tower - 10.6\"W x 10.6\"D x 38.4\"H\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eFloor-mounted - freestanding\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eStones touch heating elements directly\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eRemovable ribs + prop blocks\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003ePremium stainless steel\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eSGS certified - up to 230°F\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eRed Dot Award winner\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003e240V \/ 1-phase\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eUKU control compatible\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003e5-year warranty\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eMade in Estonia\u003c\/span\u003e\n\u003c\/div\u003e\n\u003chr class=\"sl-divider\"\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"sl-spec-grid\"\u003e\n\u003cdiv class=\"sl-spec-tables\"\u003e\n\u003cdiv class=\"sl-spec-block\"\u003e\n\u003ch4\u003ePower and electrical\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower output\u003c\/td\u003e\n\u003ctd\u003e9 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e240V \/ 1-phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmperage\u003c\/td\u003e\n\u003ctd\u003e37.5 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit breaker required\u003c\/td\u003e\n\u003ctd\u003e50 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire gauge\u003c\/td\u003e\n\u003ctd\u003e8 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003eSGS (fully accepted in USA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax temperature\u003c\/td\u003e\n\u003ctd\u003e230°F (vs 194°F for UL-listed heaters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-spec-block\"\u003e\n\u003ch4\u003ePhysical dimensions and weight\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e10.6\" (270 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth\u003c\/td\u003e\n\u003ctd\u003e10.6\" (270 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e38.4\" (975 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeater weight\u003c\/td\u003e\n\u003ctd\u003e35.2 lbs (16 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping weight (with stones)\u003c\/td\u003e\n\u003ctd\u003e200 lbs (91 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting type\u003c\/td\u003e\n\u003ctd\u003eFloor-mounted, freestanding\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-spec-block\"\u003e\n\u003ch4\u003ePerformance and room sizing\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum room volume\u003c\/td\u003e\n\u003ctd\u003e283 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum room volume\u003c\/td\u003e\n\u003ctd\u003e460 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone capacity\u003c\/td\u003e\n\u003ctd\u003e165 lbs (5 boxes required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeating speed advantage\u003c\/td\u003e\n\u003ctd\u003eUp to 25% faster - internal air duct system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWall safety distance\u003c\/td\u003e\n\u003ctd\u003e9.45\" (24 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSteam type\u003c\/td\u003e\n\u003ctd\u003eSoft, long-lasting - wet or dry use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-spec-block\"\u003e\n\u003ch4\u003eConstruction and design\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody material\u003c\/td\u003e\n\u003ctd\u003ePremium stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeating elements\u003c\/td\u003e\n\u003ctd\u003eIndustrial-grade stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone contact\u003c\/td\u003e\n\u003ctd\u003eDirect - stones in contact with heating elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAir duct system\u003c\/td\u003e\n\u003ctd\u003eInternal - circulates air through stone mass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone stacking\u003c\/td\u003e\n\u003ctd\u003eRemovable ribs + prop blocks for stable stacking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExterior surface\u003c\/td\u003e\n\u003ctd\u003eNatural stone surface all around\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign award\u003c\/td\u003e\n\u003ctd\u003eRed Dot Product Design Award\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eMade in Estonia by HUUM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-spec-block\"\u003e\n\u003ch4\u003eControl compatibility\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible controls\u003c\/td\u003e\n\u003ctd\u003eHUUM UKU Local, UKU Wi-Fi, UKU Glass Wi-Fi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl sold separately\u003c\/td\u003e\n\u003ctd\u003eYes - must be purchased separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUKU Local features\u003c\/td\u003e\n\u003ctd\u003eWall panel, remote control, light\/ventilation\/steamer integration, door sensor, overheating protection, child lock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUKU Wi-Fi features\u003c\/td\u003e\n\u003ctd\u003eAll Local features + HUUM app control from smartphone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUKU Glass Wi-Fi\u003c\/td\u003e\n\u003ctd\u003eElegant glass panel with integrated Wi-Fi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e104°F to 230°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-spec-image\"\u003e\n\u003cdiv class=\"sl-spec-block\"\u003e\n\u003ch4\u003eOptional accessories\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety railing\u003c\/td\u003e\n\u003ctd\u003eLight wood profiles - prevents accidental contact, sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflector panel\u003c\/td\u003e\n\u003ctd\u003eStainless steel - mounts on side, reduces wall safety distance by half, sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUKU Extension Box\u003c\/td\u003e\n\u003ctd\u003eRequired for CLIFF 10.5kW only - not needed for 9kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-spec-block\"\u003e\n\u003ch4\u003eRecommended stones\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone type\u003c\/td\u003e\n\u003ctd\u003eRounded olivine-diabase - 5 to 10 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity required\u003c\/td\u003e\n\u003ctd\u003e5 boxes (33 lbs each = 165 lbs total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStones included\u003c\/td\u003e\n\u003ctd\u003eNo - sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWhy rounded\u003c\/td\u003e\n\u003ctd\u003eComplement CLIFF design, produce milder steam, high heat capacity, durable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStones to avoid\u003c\/td\u003e\n\u003ctd\u003eDecorative stones (can break easily at sauna temperatures)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cdiv class=\"sl-inc-grid\"\u003e\n\u003cdiv class=\"sl-inc-item\"\u003eHUUM CLIFF 9kW electric sauna heater\u003c\/div\u003e\n\u003cdiv class=\"sl-inc-item\"\u003eAdjustable floor legs\u003c\/div\u003e\n\u003cdiv class=\"sl-inc-item\"\u003eRemovable ribs for stone stacking\u003c\/div\u003e\n\u003cdiv class=\"sl-inc-item\"\u003eProp blocks for stone stacking stability\u003c\/div\u003e\n\u003cdiv class=\"sl-inc-item\"\u003eInstallation and wiring diagram manual\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 Sauna stones (5 boxes required, sold separately), UKU control unit (required, sold separately), safety railing (optional, sold separately), reflector panel (optional, sold separately).\u003c\/p\u003e\n\u003chr class=\"sl-divider\"\u003e\n\u003ch3\u003eWhy the CLIFF 9 stands out\u003c\/h3\u003e\n\u003cdiv class=\"sl-feat-grid\"\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003eSlim tower - 9.45\" wall clearance\u003c\/div\u003e\n\u003cp\u003eAt 10.6\" wide with only 9.45\" required wall clearance, the CLIFF fits in corners, small rooms, and beside benches where conventional heaters cannot go. The internal air duct system achieves this without compromising performance - it actively cools the surrounding structure while heating the stone mass.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003e25% faster heating - internal air duct\u003c\/div\u003e\n\u003cp\u003eThe air duct draws cool air from the base, channels it through the heated stone core, and releases it from the top. This forced internal circulation heats the stones more evenly, reaches equilibrium temperature faster, and produces consistent heat distribution throughout the sauna room.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003e165 lbs of stone capacity\u003c\/div\u003e\n\u003cp\u003eA substantial stone load that stores significant thermal energy and releases it gradually. Stones sit in direct contact with the heating elements for maximum heat transfer efficiency. The result is the soft, long-lasting steam associated with traditional wood-fired saunas - not the sharp steam burst of under-stoned electric heaters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003eSGS certified - up to 230°F\u003c\/div\u003e\n\u003cp\u003eSGS certification (fully accepted in the USA) allows the CLIFF to reach 230°F - 36 degrees higher than the 194°F ceiling imposed on UL-listed heaters. This matters: traditional Finnish sauna is experienced at 176°F to 212°F at bench level. The CLIFF makes that experience genuinely achievable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003eRed Dot Award design\u003c\/div\u003e\n\u003cp\u003eThe natural stone surface surrounds the heater on all four sides, making it visually resolved from every angle inside the sauna room. No exposed metal housing, no visible back panel. The CLIFF is designed to be looked at from all sides - not positioned against a wall to hide it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003eUKU control ecosystem\u003c\/div\u003e\n\u003cp\u003eChoose Local (wall panel + remote control), Wi-Fi (smartphone app + remote preheat), or Glass Wi-Fi (elegant glass panel with integrated Wi-Fi). All UKU units include door sensor, overheating protection, and child lock. Sold separately - can be selected to match your sauna setup and usage preferences.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"sl-divider\"\u003e\n\u003ch3\u003eAbout HUUM\u003c\/h3\u003e\n\u003cdiv class=\"sl-brand1\"\u003e\n\u003cimg alt=\"HUUM CLIFF 9kW electric sauna heater showing slim tower profile with natural stone surface\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0627\/7778\/6508\/files\/huum-cliff-main.jpg\" class=\"sl-brand-img\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"sl-brand-tag\"\u003eMade in Estonia\u003c\/span\u003e\n\u003ch4\u003eHUUM. Precision-crafted sauna heaters that reach temperatures others cannot.\u003c\/h4\u003e\n\u003cp\u003eHUUM is an Estonian sauna heater manufacturer that has made genuine engineering innovation the foundation of its product range. The CLIFF is the expression of a specific engineering question: how much can wall clearance be reduced without compromising the performance or safety of an electric sauna heater? The internal air duct system is HUUM's answer - a structural innovation that actively manages heat distribution rather than relying on passive radiation, enabling the slim tower profile and reduced safety distances that make the CLIFF the most space-efficient high-capacity electric sauna heater available.\u003c\/p\u003e\n\u003cul class=\"sl-check\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e9.45\" wall safety distance\u003c\/strong\u003e - the internal air duct actively cools surrounding walls\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 25% faster heating\u003c\/strong\u003e - forced air circulation through the stone mass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e165 lbs stone capacity\u003c\/strong\u003e - direct stone-to-element contact, soft long-lasting steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSGS certified - 230°F maximum\u003c\/strong\u003e - true Finnish sauna temperatures achievable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-year warranty\u003c\/strong\u003e - fully serviceable, replacement parts available\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-brand2\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"sl-brand-tag\"\u003eAbout HUUM\u003c\/span\u003e\n\u003ch4\u003ePrecision sauna heaters, handcrafted in Estonia for the global market\u003c\/h4\u003e\n\u003cp\u003eEvery HUUM heater is produced in Estonia - handcrafted components assembled with careful attention to detail and craftsmanship. HUUM uses high-quality stainless steel throughout, minimising the amount of metal exposed to sauna heat so that the majority of thermal energy derives from the stone mass rather than from metal surfaces. This is the same principle behind traditional wood-fired sauna heating - large stone mass, minimal metal - applied to electric heating technology. The small metal footprint also maximises the proportion of beneficial negative ions in the sauna air, consistent with the known health benefits of traditional Finnish sauna.\u003c\/p\u003e\n\u003cp\u003eThe CLIFF ships from Chicago on a wooden freight pallet. Typical lead time is 7 to 9 days from order. Curbside delivery - a tracking number is provided when the order ships. Installation requires a licensed electrician for the 240V\/1-phase circuit. HUUM recommends having the electrician review the wiring diagram included with the heater before installation. The CLIFF must be installed with the correct stone type and quantity (5 boxes of rounded olivine-diabase) to maintain warranty coverage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"HUUM CLIFF heater installed in sauna room showing slim profile next to bench\" src=\"https:\/\/thesaunaheater.com\/cdn\/shop\/files\/HUUM-Cliff-Electric-Sauna-Heater_550x.jpg?v=1704577763\" class=\"sl-brand-img\"\u003e\n\u003c\/div\u003e\n\u003chr class=\"sl-divider\"\u003e\n\u003ch3\u003eManuals and Documents\u003c\/h3\u003e\n\u003cdiv class=\"sl-manual\"\u003e\n\u003ch5\u003eInstallation manual and wiring diagram\u003c\/h5\u003e\n\u003cp\u003eThe installation manual and wiring diagram are included with the HUUM CLIFF 9 heater and are also available for download below. The wiring diagram shows the 240V\/1-phase circuit requirements including breaker size (50A) and wire gauge (8 AWG). Review the manual before scheduling your electrician to ensure the circuit preparation is correct before the heater arrives. The manual also covers stone placement using the removable ribs and prop blocks, UKU control wiring, and safety distance requirements for the 9kW model (9.45\" from walls).\u003c\/p\u003e\n\u003ch6\u003eDownloads\u003c\/h6\u003e\n\u003cdiv class=\"sl-doc-links\"\u003e\n\u003ca href=\"https:\/\/prod.cms.bathingbrands.com\/sites\/default\/files\/2025-11\/HUUM-CLIFF-Sauna-Heater-IOM.pdf\" class=\"sl-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 CLIFF Installation Manual (PDF) \u003c\/a\u003e \u003ca href=\"https:\/\/prod.cms.bathingbrands.com\/sites\/default\/files\/2025-12\/-HUUM-Stone-Requirements.pdf\" class=\"sl-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 HUUM-Stone-Requirements (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cdiv class=\"sl-warranty\"\u003e\n\u003ch5\u003e5-year HUUM limited warranty\u003c\/h5\u003e\n\u003cp\u003eThe HUUM CLIFF 9kW electric sauna heater is covered by HUUM's \u003cstrong\u003e5-year limited warranty\u003c\/strong\u003e from the date of purchase. The warranty covers defects in materials and workmanship under normal residential use. To maintain warranty coverage, the heater must be installed with the correct stone type and quantity (5 boxes of CLIFF-compatible rounded olivine-diabase stones) and operated with a compatible HUUM UKU control unit. The warranty does not cover damage from improper installation, use with incorrect stones (including decorative stones), operation without the required stone load, or electrical damage from incorrect circuit configuration. The CLIFF is fully serviceable - replacement heating elements and components are available. Proof of purchase is required for warranty claims. We are an authorised HUUM dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HUUM","offers":[{"title":"240V\/1PH (Home Use)","offer_id":52190645715226,"sku":"H1004022","price":2638.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/1690\/0634\/files\/huum-cliff-main.jpg?v=1778268153","url":"https:\/\/mediriser.com\/products\/huum-cliff-9-cliff-series-9kw-sauna-heater","provider":"Mediriser","version":"1.0","type":"link"}