{"product_id":"huum-hive-18-hive-series-18-0kw-sauna-heater","title":"HUUM HIVE 18 HIVE Series 18.0kW Sauna Heater","description":"\u003c!-- HUUM HIVE 15 - 15kW Floor-Standing Sauna Heater, Beehive Cage Form - Standalone --\u003e\u003c!-- SKU: H1003022 | HIVE Series | 530-813 cu ft | Floor-standing beehive cage | Heater only --\u003e\u003c!-- UKU control + UKU Extension Box + 528 lbs stones all sold separately --\u003e\u003c!-- Dual 50A circuits \/ 8 AWG | Heaviest HIVE circuit | SGS Listed | Made in Estonia --\u003e\u003c!-- 5-year warranty (elements excluded) --\u003e\u003c!-- 6 document sections: IOM | Warranty | Element Requirements | Stone Requirements | Certificate of Compliance | Size Your Sauna --\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; 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}\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-yellow { background: #fffbeb; border: 1px solid #fcd34d; border-radius: 6px; padding: 0.9rem 1.1rem; margin-bottom: 1.5rem; font-weight: 500 !important; color: #78350f !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-item { margin-bottom: 1.25rem; padding-bottom: 1.25rem; border-bottom: 1px solid #e2e8f0; }\n  .sl-manual-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }\n  .sl-manual-item h6 { font-size: 14px; font-weight: 700 !important; color: #0f172a !important; margin: 0 0 0.5rem; }\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\u003ch2\u003eHUUM HIVE 18 HIVE Series 18.0kW Sauna Heater\u003c\/h2\u003e\n\u003cp\u003eThe HUUM HIVE 15 is a 15kW floor-standing electric sauna heater for rooms from 530 to 813 cubic feet, with the distinctive open beehive cage form. This listing is the heater only. A UKU control unit, UKU Extension Box, and sauna stones are all required for operation and sold separately. The HIVE 15 is the top-output model in the HUUM HIVE floor-standing series - the highest output and largest room coverage of any full-size HIVE, for rooms from 530 to 813 cubic feet on a dual 50A \/ 8 AWG circuit configuration. The UKU Extension Box is required at 15kW and must be purchased alongside the control and stones when ordering this standalone heater. For a complete installation in a single purchase, see the HUUM HIVE 15STU Package at BathingBrands.\u003c\/p\u003e\n\u003ch4\u003eTop of the HIVE series - 15kW and 530-813 cu ft\u003c\/h4\u003e\n\u003cp\u003eThe full-size HUUM HIVE series runs at two output levels: HIVE 12 (12kW, 424-636 cu ft, dual 30A \/ 10 AWG) and HIVE 15 (15kW, 530-813 cu ft, dual 50A \/ 8 AWG). The HIVE 15 is the higher output, for the larger room range - the top of the full-size HIVE family. For large dedicated sauna rooms from 530 to 813 cubic feet, commercial sauna installations, and high-capacity residential applications where the HIVE 12's 636 cu ft ceiling is insufficient, the HIVE 15 is the correct HIVE choice. Both models use the same 18.11\" (460 mm) open beehive cage form and 528-lb stone capacity - the difference is output, room range, and electrical specification. The HIVE 15's dual 50A \/ 8 AWG circuit is heavier than the HIVE 12's dual 30A \/ 10 AWG: two 50A breaker slots and two 8 AWG wire runs are required.\u003c\/p\u003e\n\u003ch4\u003eDual 50A \/ 8 AWG - the heaviest HIVE electrical configuration\u003c\/h4\u003e\n\u003cp\u003eThe HIVE 15 requires two separate 50A \/ 8 AWG circuits - two 50A breaker slots in the electrical panel and two separate 8 AWG wire runs from the panel to the heater location. This is the heaviest electrical specification of any HUUM HIVE model: the HIVE 12 uses dual 30A \/ 10 AWG (lighter), and the HIVE Mini series uses single circuits at 30A, 50A, or 50A depending on model. Confirm the electrical panel has two available 50A slots before ordering. Two separate circuits means the wire run planning must account for both cables running to the heater location simultaneously. A licensed electrician is required for both circuit connections. Do not connect to GFI\/GFCI breakers.\u003c\/p\u003e\n\u003ch4\u003e528 lbs of stones and three required components\u003c\/h4\u003e\n\u003cp\u003eAs with the HIVE 12, the HIVE 15 requires three separate component purchases alongside the heater: a UKU control unit (Local Black or WiFi), a UKU Extension Box (required at 15kW), and 528 lbs of 2\"-4\" (5-10 cm) rounded olivine diabase stones. All three are sold separately at BathingBrands. The HIVE 15STU Package bundles all four components (heater, control, Extension Box, and stones) in a single purchase. When ordering the standalone heater, confirm all three required components are included in the order before checkout.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-hook\"\u003e15kW floor-standing sauna heater for rooms from 530 to 813 cubic feet. Top of the HIVE series. Open 18.11\" beehive cage form. 528 lbs stone capacity - 2\"-4\" rounded olivine. Dual 50A \/ 8 AWG circuits - two separate 50A breakers and 8 AWG wire runs required. UKU Extension Box required - not included in this listing. Required (all sold separately): UKU control (Local Black or WiFi); UKU Extension Box; 528 lbs stones. SGS Listed. 5-year warranty (elements excluded). Made in Estonia by HUUM. See HIVE 15STU Package for complete bundled purchase.\u003c\/div\u003e\n\u003cdiv class=\"sl-badges\"\u003e\n\u003cspan class=\"sl-badge\"\u003e15 kW\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003e530 to 813 cu ft\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eTop of the HIVE series\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eOpen 18.11\" beehive cage form\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003e528 lb stone capacity\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003e2\"-4\" rounded olivine stones (sold separately)\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eDual 50A breakers \/ 8 AWG - two circuits\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eUKU Extension Box required (sold separately)\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eUKU control sold separately\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003eSGS Listed - made in Estonia\u003c\/span\u003e \u003cspan class=\"sl-badge\"\u003e5-year warranty (elements excluded)\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\u003eElectrical\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\u003e15 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e240V \/ 1-phase \/ 60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit configuration\u003c\/td\u003e\n\u003ctd\u003eDual circuits - two separate 50A breakers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire gauge per circuit\u003c\/td\u003e\n\u003ctd\u003e8 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUKU Extension Box\u003c\/td\u003e\n\u003ctd\u003eRequired - sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003eSGS Listed\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\u003eRoom sizing and stones\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoom volume\u003c\/td\u003e\n\u003ctd\u003e530 to 813 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone capacity\u003c\/td\u003e\n\u003ctd\u003e528 lbs\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\u003eStone size\u003c\/td\u003e\n\u003ctd\u003e2\" to 4\" (5-10 cm) rounded olivine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax temperature\u003c\/td\u003e\n\u003ctd\u003e230°F (110°C)\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\u003eDesign and installation\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eForm\u003c\/td\u003e\n\u003ctd\u003eOpen hexagonal beehive cage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e18.11\" (460 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eFloor-standing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eStainless steel cage and elements\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\u003c\/div\u003e\n\u003cdiv class=\"sl-spec-image\"\u003e\n\u003cdiv class=\"sl-spec-block\"\u003e\n\u003ch4\u003eRequired components (sold separately)\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eUKU Local Black\u003c\/td\u003e\n\u003ctd\u003eWall-mounted digital control - on-site operation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUKU WiFi\u003c\/td\u003e\n\u003ctd\u003eHUUM app - iOS and Android - remote preheat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUKU Extension Box\u003c\/td\u003e\n\u003ctd\u003eRequired at 15kW - sold separately at BathingBrands\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStones\u003c\/td\u003e\n\u003ctd\u003e528 lbs (2\"-4\" rounded olivine)\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\u003eHIVE series comparison\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHIVE 12kW\u003c\/td\u003e\n\u003ctd\u003e424-636 cu ft | Dual 30A \/ 10 AWG | 528 lbs | Ext box req\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHIVE 15kW (this listing)\u003c\/td\u003e\n\u003ctd\u003e530-813 cu ft | Dual 50A \/ 8 AWG | 528 lbs | Ext box req\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHIVE Mini 6kW\u003c\/td\u003e\n\u003ctd\u003e177-318 cu ft | 30A \/ 10 AWG | 330 lbs | No ext box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHIVE Mini 9kW\u003c\/td\u003e\n\u003ctd\u003e318-530 cu ft | 50A \/ 8 AWG | 330 lbs | No ext box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHIVE Mini 10.6kW\u003c\/td\u003e\n\u003ctd\u003e353-706 cu ft | 50A \/ 8 AWG | 330 lbs | Ext box req\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\u003eWarranty\u003c\/h4\u003e\n\u003ctable class=\"sl-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty period\u003c\/td\u003e\n\u003ctd\u003e5 years (elements excluded)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eH1003022\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=\"sl-divider\"\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cdiv class=\"sl-inc-grid\"\u003e\n\u003cdiv class=\"sl-inc-item\"\u003eHUUM HIVE 15kW floor-standing sauna heater - 18.11\" open beehive cage\u003c\/div\u003e\n\u003cdiv class=\"sl-inc-item\"\u003eInstallation and operation manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin-top: 1rem; font-weight: 500; color: #64748b; font-size: 14px;\"\u003e\u003cstrong\u003eRequired (all sold separately):\u003c\/strong\u003e UKU control unit (Local Black or WiFi); UKU Extension Box (required at 15kW); 528 lbs sauna stones (2\"-4\" rounded olivine). \u003cstrong\u003eSee also:\u003c\/strong\u003e HIVE 15STU Package for all components bundled. A licensed electrician is required. Two 50A breakers and two 8 AWG wire runs needed. Do not connect to GFI\/GFCI breakers.\u003c\/p\u003e\n\u003chr class=\"sl-divider\"\u003e\n\u003ch3\u003eWhy the HUUM HIVE 15 stands out\u003c\/h3\u003e\n\u003cdiv class=\"sl-feat-grid\"\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003eTop of the HIVE series - 530-813 cu ft\u003c\/div\u003e\n\u003cp\u003eThe HIVE 15 covers the largest room range of any full-size HIVE model - 530 to 813 cubic feet. For large dedicated sauna rooms, commercial sauna facilities, and high-capacity installations where the HIVE 12's 636 cu ft ceiling is insufficient, the HIVE 15 is the correct and only full-size HIVE choice. At 813 cu ft it covers some of the largest room volumes served by any residential-grade HUUM heater.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003eSame beehive cage as HIVE 12 - more output\u003c\/div\u003e\n\u003cp\u003eThe HIVE 15 uses the same 18.11\" open beehive cage form as the HIVE 12 and the same 528-lb stone capacity. The visible difference in the sauna room between the two models is zero - the same stone column, the same cage diameter, the same visual presence. The difference is entirely in the output (15kW vs 12kW), the room range (530-813 vs 424-636 cu ft), and the heavier dual 50A \/ 8 AWG circuit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003e528 lbs of stone at 15kW - peak HIVE performance\u003c\/div\u003e\n\u003cp\u003eAt 15kW driving 528 lbs of stone mass, the HIVE 15 produces the fastest heat-up of any full-size HIVE model in the large rooms it serves and the greatest capacity to sustain temperature through continuous back-to-back commercial sessions. For a 530-813 cu ft sauna room with multiple bathers in rotation, the 528-lb stone load at 15kW provides the thermal reserve and recovery time that smaller heaters and lighter stone loads cannot match.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003eDual 50A \/ 8 AWG - heaviest HIVE circuit\u003c\/div\u003e\n\u003cp\u003eTwo separate 50A breakers and two 8 AWG wire runs are the heaviest electrical specification of any HUUM HIVE heater. Confirm the panel has two available 50A slots before ordering. The HIVE 12 uses dual 30A \/ 10 AWG - if a lighter dual-circuit configuration is acceptable for the room size, the HIVE 12 is the less demanding electrical option where the room falls within the 424-636 cu ft overlap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003eExtension Box required - essential at 15kW\u003c\/div\u003e\n\u003cp\u003eThe UKU Extension Box is required for the HIVE 15 and is not included in this standalone listing. It is included in the HIVE 15STU Package. When ordering the standalone heater, add the Extension Box to the order with the UKU control and stones. Three separate item purchases are required: control, Extension Box, and stones. The HIVE 15STU Package bundles all four components in one purchase.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-feat\"\u003e\n\u003cdiv class=\"sl-feat-title\"\u003eHIVE 15STU Package - the complete purchase path\u003c\/div\u003e\n\u003cp\u003eThe HIVE 15STU Package at BathingBrands bundles the HIVE 15 heater, UKU control (Local Black or WiFi at checkout), UKU Extension Box, and 528 lbs of stones in a single purchase. For most new HIVE 15 installations, the Package is the more convenient option. This standalone listing is for buyers replacing just the heater in an existing HIVE 15 installation or sourcing components individually for a staged purchase.\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 class=\"sl-brand-img\" src=\"https:\/\/prod.cms.bathingbrands.com\/sites\/default\/files\/2022-11\/HivePKG1.jpg\" alt=\"HUUM HIVE 15kW floor-standing sauna heater 18.11 inch open beehive cage 528 lbs stone capacity dual 50A circuits top of HIVE series\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"sl-brand-tag\"\u003eMade in Estonia - SGS Listed\u003c\/span\u003e\n\u003ch4\u003eHUUM HIVE 15. 15kW. 530-813 cu ft. 18.11\" beehive cage. 528 lbs of stone. Dual 50A circuits.\u003c\/h4\u003e\n\u003cp\u003eHUUM is an Estonian sauna heater company. The HIVE 15 is the top-output model in the HUUM HIVE floor-standing series - the same 18.11\" open beehive cage and 528-lb stone capacity as the HIVE 12, now at 15kW for rooms from 530 to 813 cubic feet on dual 50A \/ 8 AWG circuits. This listing is the heater only. UKU control, UKU Extension Box, and 528 lbs of stones are all required and sold separately. See the HIVE 15STU Package for a bundled purchase. We are an authorized HUUM dealer.\u003c\/p\u003e\n\u003cul class=\"sl-check\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e15kW, 530-813 cu ft\u003c\/strong\u003e - dual 50A \/ 8 AWG, 240V\/1PH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e18.11\" open beehive cage\u003c\/strong\u003e - 528 lbs stone capacity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop of the HIVE series\u003c\/strong\u003e - largest output and room range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUKU Extension Box required\u003c\/strong\u003e - sold separately (included in PKG)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHIVE 15STU Package available\u003c\/strong\u003e - all components bundled\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-brand2\" style=\"text-align: start;\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"sl-brand-tag\"\u003eHIVE 15 vs HIVE 12 - top vs entry full-size HIVE\u003c\/span\u003e\n\u003ch4\u003eHIVE 15 (dual 50A) vs HIVE 12 (dual 30A) - when each is correct\u003c\/h4\u003e\n\u003cp\u003eBoth full-size HIVE models share the same 18.11\" beehive cage form and 528-lb stone capacity. HIVE 12: 12kW, 424-636 cu ft, dual 30A \/ 10 AWG. HIVE 15: 15kW, 530-813 cu ft, dual 50A \/ 8 AWG. For rooms from 424-530 cu ft, the HIVE 12 is correct - it covers the range on the lighter dual 30A circuit. For rooms from 531-813 cu ft, the HIVE 15 is the only full-size HIVE option. For rooms in the 530-636 cu ft overlap zone, the HIVE 12 is adequate for standard well-insulated rooms; the HIVE 15 provides more output headroom for cold surfaces or high-frequency commercial use. The HIVE 15's dual 50A \/ 8 AWG requirement is significantly heavier than the HIVE 12's dual 30A \/ 10 AWG - confirm panel capacity for both 50A slots before selecting the HIVE 15 in a borderline room. Both require the UKU Extension Box. A licensed electrician is required for both. Do not connect to GFI\/GFCI breakers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg class=\"sl-brand-img\" src=\"https:\/\/mediriser.com\/cdn\/shop\/files\/Hive_201.jpg?crop=center\u0026amp;height=480\u0026amp;v=1779706273\u0026amp;width=480\" alt=\"HUUM HIVE 15kW top of series versus HIVE 12 entry same beehive cage dual 50A versus dual 30A circuit comparison\" style=\"margin-bottom: 16px; float: none;\"\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\u003cdiv class=\"sl-manual-item\"\u003e\n\u003ch6\u003eInstallation and Operation Manual\u003c\/h6\u003e\n\u003ca class=\"sl-doc-link\" href=\"https:\/\/prod.cms.bathingbrands.com\/sites\/default\/files\/2025-11\/HUUM-HIVE-Sauna-Heater-IOM.pdf\" target=\"_blank\"\u003e \u003csvg stroke-width=\"2\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\" height=\"14\" width=\"14\"\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=\"sl-manual-item\"\u003e\n\u003ch6\u003eWarranty\u003c\/h6\u003e\n\u003ca class=\"sl-doc-link\" href=\"https:\/\/prod.cms.bathingbrands.com\/sites\/default\/files\/2025-09\/HUUM-Warranty.pdf\" target=\"_blank\"\u003e \u003csvg stroke-width=\"2\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\" height=\"14\" width=\"14\"\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 Warranty Information (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-manual-item\"\u003e\n\u003ch6\u003eElement Requirements\u003c\/h6\u003e\n\u003ca class=\"sl-doc-link\" href=\"https:\/\/prod.cms.bathingbrands.com\/sites\/default\/files\/2025-12\/-HUUM-Element-Requirements.pdf\" target=\"_blank\"\u003e \u003csvg stroke-width=\"2\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\" height=\"14\" width=\"14\"\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 Element Requirements (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-manual-item\"\u003e\n\u003ch6\u003eStone Requirements\u003c\/h6\u003e\n\u003ca class=\"sl-doc-link\" href=\"https:\/\/prod.cms.bathingbrands.com\/sites\/default\/files\/2025-12\/-HUUM-Stone-Requirements.pdf\" target=\"_blank\"\u003e \u003csvg stroke-width=\"2\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\" height=\"14\" width=\"14\"\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=\"sl-manual-item\"\u003e\n\u003ch6\u003eCertificate of Compliance\u003c\/h6\u003e\n\u003ca class=\"sl-doc-link\" href=\"https:\/\/prod.cms.bathingbrands.com\/sites\/default\/files\/2022-09\/HUUM%20Certificate%20of%20Compliance.pdf\" target=\"_blank\"\u003e \u003csvg stroke-width=\"2\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\" height=\"14\" width=\"14\"\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 Certificate of Compliance (PDF) \u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sl-manual-item\"\u003e\n\u003ch6\u003eSize Your Sauna\u003c\/h6\u003e\n\u003ca class=\"sl-doc-link\" href=\"https:\/\/prod.cms.bathingbrands.com\/sites\/default\/files\/2025-09\/Sizing-Your-HUUM.pdf\" target=\"_blank\"\u003e \u003csvg stroke-width=\"2\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\" height=\"14\" width=\"14\"\u003e\u003cpath d=\"M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6\"\u003e\u003c\/path\u003e\u003cpolyline points=\"15 3 21 3 21 9\"\u003e\u003c\/polyline\u003e\u003cline y2=\"3\" x2=\"21\" y1=\"14\" x1=\"10\"\u003e\u003c\/line\u003e\u003c\/svg\u003e Size Your Sauna (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 limited warranty (elements excluded)\u003c\/h5\u003e\n\u003cp\u003eThe HUUM HIVE 15 is covered by HUUM's \u003cstrong\u003e5-year limited warranty\u003c\/strong\u003e from the date of purchase. The warranty covers defects in manufacturing and materials under normal use conditions. Heating elements are excluded from the 5-year coverage and carry their own separate warranty period. The warranty does not cover damage caused by improper installation, operating without the required UKU Extension Box, use of incorrect or non-approved stones, operating without the required stone load, or failure to follow HUUM's installation and operating guidelines. A licensed electrician is required. Do not connect to GFI\/GFCI breakers. Two separate 50A circuits required. Proof of purchase from an authorized HUUM dealer is required. We are an authorized HUUM dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HUUM","offers":[{"title":"Default Title","offer_id":52281789874458,"sku":"H1003032","price":3088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/1690\/0634\/files\/huum-hive-sauna-heater_d0a54b4a-9d05-4c1a-a36b-854a59c3fc60.jpg?v=1779706224","url":"https:\/\/mediriser.com\/products\/huum-hive-18-hive-series-18-0kw-sauna-heater","provider":"Mediriser","version":"1.0","type":"link"}