HUUM CORE BK/ST CORE Series Sauna Heater, Customizable Exterior, Up to 10.5kW

The HUUM CORE BK/ST Sauna Heater is designed to reflect the personality of its owner while delivering exceptional performance, luxurious steam, and a clean Nordic aesthetic. Built for those who value both customization and function, the CORE BK/ST offers powerful heating in a compact, design-forward form.

Crafted in Estonia—where sauna culture is deeply rooted—the CORE BK/ST is constructed from durable stainless steel and arrives without an outer casing, allowing complete customization. The heater can be finished with ceramic tile, stone, glass, or wood, and paired with a choice of inlay finishes to create a truly personalized sauna centerpiece. Its small footprint and minimal safety clearances make it ideal for tight spaces and creative layouts, including full integration into a sauna bench.

Engineered for efficiency, the CORE heats sauna rooms quickly while allowing direct contact between the stones and heating elements. This design produces soft, abundant steam when water is ladled over the stones. Available in multiple power ratings, the CORE BK/ST supports a wide range of sauna room sizes and pairs seamlessly with HUUM UKU controls (sold separately) for precise, effortless control.

Backed by a 3-year limited residential warranty, the HUUM CORE BK/ST Sauna Heater embodies pure Nordic design—offering versatility, durability, and long-lasting relaxation in a customizable, modern form.

Features

• 240V / Single-Phase operation

• Customizable design with choice of inlay finishes

• Allows personalization with ceramic tile, stone, glass, or wood

• Compact footprint with minimal safety clearances

• Can be fully embedded into a sauna bench

• Direct contact between stones and heating elements for superior steam

• Industrial-quality stainless steel heating elements

• Designed, engineered, and manufactured in Estonia

• Compatible with HUUM UKU controls (sold separately)

• 66 lb stone capacity (requires two boxes of stones, sold separately)

• Dimensions: 12.2" W x 12.2" D x 32.7" H (31 x 31 x 83 cm)

Includes

• HUUM CORE BK/ST Sauna Heater

• Adjustable Legs (4)

• Unfinished Metal Shields (4)

• Cover Strips (4)

• Cover Strip Fastening Screws

• Installation and Operation Manual

• 3-Year Limited Residential Warranty

• 1-Year Limited Commercial Warranty (excluding heating elements)

Specifications

Available Models

• CORE BK/ST 6

  • Room Size: 177–318 cu. ft.

  • Wattage: 6.5 kW

  • Amperage: 25

  • Wire Size: AWG 10

• CORE BK/ST 9

  • Room Size: 283–460 cu. ft.

  • Wattage: 9.0 kW

  • Amperage: 37.5

  • Wire Size: AWG 8

• CORE BK/ST 11

  • Room Size: 354–566 cu. ft.

  • Wattage: 10.5 kW

  • Amperage: 43.75

  • Wire Size: AWG 8

General Specifications

• Voltage: 240V

• Phase: Single-Phase

• Amperage Range: 25–43.75

• Circuit Breaker: See Installation and Operation Manual

• Wire Size: AWG 10 or 8

• Safety Listing: CE Certified

• Minimum Ceiling Height: 80" (203 cm)

• Safety Distances: See Installation and Operation Manual

• Stone Capacity: 66 lbs (30 kg)

• Stone Size: 2"–4" (5–10 cm)

• Heater Weight: 41.9 lbs (19 kg)

• Shipping Weight (with stones): 107.9 lbs (48.9 kg)