HUUM HIVE 18kW Electric Sauna Heater | Complete Package Options

Powerful 18kW Performance

The HIVE 18kW is designed for large traditional sauna rooms where smaller heaters cannot provide enough heat output or stone mass.

Massive Stone Capacity

The HIVE 18 supports a large stone load for steady heat and soft, lasting steam. Your current page lists a large-format HIVE stone capacity around 529–552 lbs, with reduced stone volume when using the included HIVE Air Tunnel.

Authentic Löyly

Pour water over the heated stones to create the steam, humidity, and atmosphere that define a traditional Finnish-style sauna experience.

Sculptural Stainless Steel Design

The rounded stainless steel form gives the sauna interior a refined architectural focal point that feels modern, minimal, and premium.

HUUM UKU Control Compatibility

Pair your HIVE 18 with a required HUUM UKU control system for precise temperature management and optional WiFi app control depending on the selected UKU model.

UKU Extension Box Required

Because this is a large-format 18kW HUUM heater, the HUUM UKU Extension Box is required for operation along with the UKU control and sauna stones.

HIVE Air Tunnel Included

The included HUUM HIVE Air Tunnel helps improve airflow, supports faster heat-up, and reduces the amount of sauna stones needed in the center of the heater. Your current page notes that the HIVE Air Tunnel can speed heating by approximately 25% while helping extend heating-element lifespan.

Designed and Crafted in Estonia

HUUM heaters are designed, engineered, and crafted in Estonia, blending Nordic design with traditional sauna principles.

What Makes HUUM HIVE Different?

More Stones. Softer Heat. Better Steam.

The HIVE series is designed around one of the most important parts of traditional sauna bathing: the stones.

A larger stone mass helps store heat more evenly and creates softer, longer-lasting steam when water is poured over the stones. The open circular design exposes more stone surface area, helping the heater create a beautiful löyly experience that feels gentler and more enveloping than sharp, dry heat alone.

For large sauna rooms, this matters. The HIVE 18kW gives you the power needed for bigger spaces, while the massive stone capacity helps preserve the comfort, atmosphere, and ritual of authentic sauna bathing.

Is the HUUM HIVE 18kW Right for Your Sauna?

Best for Large Traditional Sauna Rooms

The HUUM HIVE 18kW is best suited for large traditional sauna rooms, wellness studios, gyms, spas, hotels, and commercial-style sauna spaces.

Published specifications list the HIVE 18 for sauna rooms approximately 636–1,236 cubic feet.

To calculate your basic sauna room size:

Length × Width × Height = Cubic Feet

Then account for cold surfaces such as:

• Glass walls or large glass doors
  
• Tile
  
• Stone
  
• Brick
  
• Concrete
  
• Log walls
  
• Other uninsulated or heat-absorbing surfaces
  

These surfaces increase the effective heating demand of the sauna room. If your sauna includes significant glass, stone, tile, or other cold surfaces, the adjusted room volume may be larger than the basic cubic footage.

Not sure if the HIVE 18kW is the right size? Contact NW Immersion before ordering and we can help confirm heater sizing, UKU control requirements, extension box requirements, stone package needs, electrical requirements, and installation considerations.

HUUM HIVE 18kW Sauna Heater

Premium floor-standing electric sauna heater designed for large traditional sauna rooms.

Pre-Installed HUUM HIVE Air Tunnel

Supports improved airflow, faster heat-up, and reduced stone volume in the center of the heater.

Adjustable Legs

Included adjustable legs help support proper heater placement and leveling during installation.

Installation & Operation Manual

Manufacturer documentation included for installation, safety clearances, operation, and maintenance.

Required but Sold Separately

• HUUM UKU Control System
  
• HUUM UKU Extension Box
  
• HUUM Sauna Stones
  

The standalone HIVE 18kW heater does not include the controller, extension box, or sauna stones. These items are required for operation and should be selected from the add-ons above when building your heater package.

General

Brand: HUUM

Model: HIVE 18

Heater Type: Electric Sauna Heater

Mounting Style: Floor-Standing

Power Rating: 18kW

Construction: Stainless Steel

Country of Origin: Estonia

Recommended Use: Large traditional sauna rooms, wellness studios, gyms, spas, hotels, and commercial-style sauna spaces

Sauna Room Sizing

Recommended Sauna Room Size: Approx. 636–989 adjusted cu. ft.

Metric Range: Approx. 18–35 m³

Maximum Temperature: Up to 230°F

Important Sizing Note: Glass, tile, stone, brick, log walls, and other cold surfaces can increase the adjusted room volume. When in doubt, contact NW Immersion before purchase so we can help confirm proper sizing.

Electrical

Supply Voltage: 240V

Phase: Single Phase

Amperage: 75A

Required Circuit Breakers: 50A + 50A

Recommended Wire Size: Confirm with official HUUM installation manual

Professional Installation: Required by a licensed electrician

Required Control: HUUM UKU Control System

Required Extension Box: HUUM UKU Extension Box

The HUUM HIVE 18kW must be installed by a licensed electrician according to the official HUUM installation manual, local code, and all applicable safety requirements. Always confirm final breaker, wiring, and installation requirements with the official manual and your electrician.

Stone Capacity

Stone Capacity: Approx. 529–552 lbs, depending on listed configuration

Stone Capacity with HIVE Air Tunnel: Approx. 463 lbs

Current Required Stone Package: 16 boxes of HUUM sauna stones

Stone Size: 5–10 cm / approx. 2–4"

Stones Required: Yes

Stones Included with Base Heater: No

Required for Operation: HUUM sauna stones must be added separately

Dimensions & Weight

Diameter: 22" / 560 mm

Height: Approx. 29.5" / 750 mm

Heater Weight: Approx. 49.7 lbs

Heater Construction: Stainless steel

Adjustable Legs: Included

Controls & Required Components

Compatible Controls: HUUM UKU Local, HUUM UKU WiFi, or compatible UKU control options

UKU Control Included with Base Heater: No

UKU Extension Box Required: Yes

Sauna Stones Included with Base Heater: No

HIVE Air Tunnel Included: Yes

Adjustable Legs Included: Yes

The HUUM HIVE 18kW must be paired with a compatible UKU control system, UKU extension box, and proper sauna stones before operation.

Plan your HUUM HIVE or HIVE Mini installation with helpful manufacturer resources, including heater manuals, UKU control documentation, main module instructions, wiring diagrams, specification sheets, and installation videos.

Before installation, we recommend sharing these resources with your licensed electrician and sauna installer so they can review heater placement, electrical requirements, control setup, stone loading, safety clearances, and installation requirements in advance.

Always follow the official HUUM installation manuals, local electrical code, and guidance from your licensed electrician. NW Immersion is also here to help with heater sizing, package selection, and general installation planning before your order ships.

Click Here for the HUUM Hive Installation & Owner's Manual

HUUM Hive Spec Diagram

HUUM Stone Requirements

Elements Required

Huum Warranty

Size Your Sauna

Click Here for the HUUM UKU Control Installation & Owner's Manual

Click Here for Video on Installing the UKU Main Module

Click Here for Video on the UKU Control Installation

Click Here for Video on how to connect the UKU Control to WiFi

• Free Shipping: This order qualifies for free shipping within the contiguous United States.
• Processing Time: In-stock items typically leave the warehouse within 1–3 business days. This is the processing period before transit, not the final delivery time.
• Confirm Availability: Inventory can change quickly. Please call, text, or email NW Immersion before ordering if you need confirmation of current stock or have a specific delivery deadline.
• Multiple Packages: The heater, sauna stones, controls, and accessories may ship in separate boxes or on separate pallets. Packages may arrive on different days.
• Tracking: Tracking information will be emailed for each shipment as soon as it leaves the warehouse.
• Inspect Upon Arrival: Check every package for visible damage before accepting delivery. Photograph any damage and contact NW Immersion promptly so we can assist.

Questions about availability, delivery, heater sizing, controls, or installation requirements? Our U.S.-based sauna specialists are available by phone, text, or email.

Click Here for the HUUM Manufacturer Warranty

HUUM Manufacturer Warranty

Backed by HUUM’s manufacturer warranty when installed and used according to HUUM’s official instructions.

Warranty coverage may vary by component, installation type, use environment, maintenance, chimney connection, and fuel use. Sauna stones, chimney components, and accessories may each carry their own warranty terms.

As an Authorized HUUM Dealer, NW Immersion is here to help with stove sizing, product selection, delivery coordination, troubleshooting, warranty guidance, and long-term support.

Always refer to the official HUUM warranty documentation included with your stove for complete terms and final coverage details.