HUUM HIVE Flow Wood Burning Sauna Stove – 9.8kW

The HUUM HIVE Flow is a premium wood-burning sauna stove designed to deliver exceptional heating efficiency, gentle steam, and environmentally responsible performance. Using HUUM’s patent-pending furnace technology , up to 75% of the heat from each log is directed straight into the sauna , dramatically reducing heat loss through the chimney while using less firewood.

Engineered for sauna rooms from 282 to 635 cubic feet , the HIVE Flow provides powerful, even heat paired with soft, long-lasting löyly . Its large 330-pound stone capacity ensures smooth temperature stability and deep, relaxing steam — ideal for traditional wood-heated sauna experiences.

The HIVE Flow is available in two configurations:

• Standard Firebox – wood is loaded from inside the sauna

• External Firebox (LS) – wood is loaded from outside the sauna via a firebox extension

Both versions deliver identical performance, efficiency, and durability — only the loading method and depth differ.

Key Features

• High-performance 9.8kW wood-burning sauna heater

• 75% heat-capture efficiency for lower wood consumption

• Soft, long-lasting steam from large stone mass

• 330 lb stone capacity (10 boxes required, sold separately)

• Patent-pending furnace construction

• Low-emission, eco-friendly design

• BImSchV and CPR certified

• Top or rear flue connection

• Designed, engineered, and manufactured in Estonia

• 3-year residential / 1-year commercial warranty

Technical Specifications (Shared by Both Variants)

Specification Value

Kilowatt Rating 9.8 kW

Primary Fuel Wood

Maximum Firewood Length 16" (40 cm)

Sauna Room Size 282 – 635 cu. ft.

Minimum Room Height 75" (191 cm)

Flue Connection Top or Back

Stone Capacity 330 lbs (10 boxes required)

Width 20.7" (53 cm)

Height 34.8" (88 cm)

Variant Differences

Feature Standard Firebox External Firebox (LS)

Wood Loading From inside the sauna From outside the sauna

Depth 24.8" (63 cm) 29.5" (75 cm)

Heater Weight 148 lbs (67 kg) 161 lbs (73 kg)

Shipping Weight w/ Stones 478 lbs (217 kg) 491 lbs (223 kg)