Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.
Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.
We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.
Sauna and heater customers also receive free shipping on sauna accessories for life.
Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Open the 3D planner.
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Contents vary by configuration. Check the row for the option selected above.
| Heat Source | Electric |
|---|---|
| Sauna Room Size | 6.5 kW: 177 to 318 cu ft · 9 kW: 283 to 460 cu ft · 10.5 kW: 354 to 566 cu ft |
| Sauna Ceiling Height | At least 80 in floor to ceiling |
| Power | 6.5, 9 and 10.5 kW |
| Power Supply | 240 V single-phase or 208 V single-phase |
| Controls | Wall control |
| Phone App | Yes, with the Wi-Fi control |
| Mounting | Floor-standing |
| Stones | 88 lb |
| Warranty | 3 years home use, 1 year commercial use (HUUM Limited Warranty v4) |
| Made in | Estonia |
| Brand | HUUM |
|---|---|
| Catalog Product | HUUM CORE Electric Sauna Heater with Alder Exterior | Black or Stainless Inlay, 6.5-10.5 kW |
| Heater Type | Electric sauna heater |
| Model Number | 6.5 kW / 240 V / 1 phase: CORE ST ALDER 6; 6.5 kW / 240 V / 1 phase: CORE BK ALDER 6; 9 kW / 240 V / 1 phase: CORE ST ALDER 9; 9 kW / 240 V / 1 phase: CORE BK ALDER 9; 10.5 kW / 240 V / 1 phase: CORE ST ALDER 11; 10.5 kW / 240 V / 1 phase: CORE BK ALDER 11 |
| SKU / Part Number | CORE ALDER |
| Maximum Room Volume | 6.5 kW / 240 V / 1 phase: 318 ft³; 9 kW / 240 V / 1 phase: 460 ft³; 10.5 kW / 240 V / 1 phase: 566 ft³ |
|---|---|
| Minimum Room Volume | 6.5 kW / 240 V / 1 phase: 177 ft³; 9 kW / 240 V / 1 phase: 283 ft³; 10.5 kW / 240 V / 1 phase: 354 ft³ |
| Minimum Circuit | 6.5 kW / 240 V / 1 phase: 30 A; 9 kW / 240 V / 1 phase, 10.5 kW / 240 V / 1 phase: 50 A |
|---|---|
| Phase | 1 phase |
| Rated Current | 25 A (6.5 kW), 37.5 A (9 kW), 43.75 A (10.5 kW) |
| Rated Power | 6.5 kW / 240 V / 1 phase: 6.5 kW; 9 kW / 240 V / 1 phase: 9 kW; 10.5 kW / 240 V / 1 phase: 10.5 kW |
| Supply Voltage | 240 V |
| Wire Size | 10 AWG (6.5 kW), 8 AWG (9 and 10.5 kW) |
| Assembled Dimensions | 15.16"W x 15.16"D x 32.7"H |
|---|---|
| Heater Depth | 15.16 in |
| Heater Height | 32.68 in |
| Heater Weight | 41.9 lb |
| Heater Width | 15.16 in |
| Minimum Host-Room Height | 80 in |
| Product Weight | 41.9 lbs |
| Ceiling-Clearance Reference Height Above Finished Floor | 32.68 in |
|---|---|
| Ceiling-Clearance Reference Plane | Top Of Rocks |
| Clearance to Floor | 0.98 in |
| Combustible Perimeter Clearance | 1.97 in |
| Minimum Spacing from Adjacent Surfaces | 1.97 in |
| Top of Rocks Above Finished Floor | 32.68 in |
| Included Components | Sauna Heater, Adjustable Legs (4), Unfinished Metal Shields (4), Cover Strips (4), Wood Panels (4), Cover Strip Fastening Screws, Wood Panel Fastening Screws, Installation and Operation Manual |
|---|---|
| Required, Not Included | HUUM UKU control and 88.2 lb of 2 to 4 in sauna stones (3 × 33 lb boxes) |
| Certifications & Listings | CE |
|---|
| Residential Warranty | 3-Year Limited Residential Warranty and 1-Year Limited Commercial Warranty (Excluding Elements) |
|---|
Use the attached current manual and a qualified installer for final sizing, wiring, clearances, venting, and local-code compliance.
An electric sauna heater that heats the room and stone mass for traditional löyly. Treat the heater, control, electrical supply, clearances, ventilation, and stones as one installation system.
Complete the system with these items.
Model-specific replacements and compatible system components.
Compare these options; sizing, power, controls, clearances, and stones may differ.
Current installation and operation manual for the UKU 4.2 controllers sold by Sauna Marketplace. Owners of older UKU 4.1 controllers should use the legacy manual that matches their installed hardware.
Current official HUUM US manual, verified by Sauna Marketplace on 2026-08-08. Applies to the current CORE manual generation.
Current official HUUM limited warranty terms linked from HUUM's U.S. warranty page and verified by Sauna Marketplace on 2026-08-08.
Current US HUUM replacement-element matrix. HIVE Mini 6 uses three SP0008 2.0 kW elements; HIVE Mini 9 uses three SP0009 3.0 kW elements; HIVE Mini 11 uses three SP0010 3.5 kW elements.
Use these only when the document revision matches the installed product.
Legacy manual for existing UKU 4.1 installations only. Sauna Marketplace now sells UKU 4.2. For a new controller, use the UKU 4.2 manual.
Archived by Sauna Marketplace; retained for installed-base and historical-link support.
HUUM CORE electric sauna heater with your choice of Alder, Aspen, or Thermo-Aspen exterior and a Black or Stainless Steel inlay. Available in 6.5, 9, and 10.5 kW.
We recommend UKU Wi-Fi Glass, preselected for new packages.
See your heater and options in 3D ↑
Keep the selected model and required components together before your installer starts.
Open your installation packYour orders and saved documents · Contact Sauna Marketplace · 844-565-1113
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We handle your order from checkout to delivery. We sell at the lowest price the manufacturers allow, and we're a call away long after it arrives.
Choose Affirm at checkout to see your payment options. Approval and terms depend on eligibility.
We teamed up with FLEX to make HSA/FSA payments easier than ever.
The HUUM CORE Electric Sauna Heater combines a compact footprint with a customizable wood exterior. Choose Alder, Aspen, or Thermo-Aspen panels and pair them with a Black or Stainless Steel inlay to match your sauna.
The pre-fitted wood panels create a finished look and help reduce accidental contact with hot metal surfaces. The CORE can also be embedded into a sauna bench where approved clearances are maintained.
Required control and sauna stones (3 boxes) are sold separately.
Bought this one? Yours would be the first. Every rating goes through the same check before it appears.
What customers say about working with our team, word for word. Names are shortened to a first name and last initial, or to initials.
★★★★★“Website very helpful, customer service very good”
★★★★★“Very friendly, informative and great shipping time.”
★★★★★“Excellent customer service”
★★★★★“Website very helpful, customer service very good”
★★★★★“Very friendly, informative and great shipping time.”
★★★★★“Excellent customer service”
★★★★★“Website very helpful, customer service very good”
★★★★★“Very friendly, informative and great shipping time.”
★★★★★“Excellent customer service”
★★★★★“Website very helpful, customer service very good”
★★★★★“Very friendly, informative and great shipping time.”
★★★★★“Excellent customer service”
★★★★★“Website very helpful, customer service very good”
★★★★★“Very friendly, informative and great shipping time.”
★★★★★“Excellent customer service”
★★★★★“Website very helpful, customer service very good”
★★★★★“Very friendly, informative and great shipping time.”
★★★★★“Excellent customer service”
Planning guides: Sauna heater calculator · Electric sauna heater reviews
Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.
Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.
We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.
Sauna and heater customers also receive free shipping on sauna accessories for life.
Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Open the 3D planner.
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Sauna heater, adjustable legs (4), unfinished metal shields (4), cover strips (4), wood panels (4), cover strip fastening screws, wood panel fastening screws, installation and operation manual.
88.2 lb of 2 to 4 in stones (3 × 33 lb boxes).
Contents vary by configuration. Check the row for the option selected above.
| Heat Source | Electric |
|---|---|
| Sauna Room Size | 6.5 kW: 177 to 318 cu ft · 9 kW: 283 to 460 cu ft · 10.5 kW: 354 to 566 cu ft |
| Sauna Ceiling Height | At least 80 in floor to ceiling |
| Power | 6.5, 9 and 10.5 kW |
| Power Supply | 240 V single-phase or 208 V single-phase |
| Controls | Wall control |
| Phone App | Yes, with the Wi-Fi control |
| Mounting | Floor-standing |
| Stones | 88 lb |
| Warranty | 3 years home use, 1 year commercial use (HUUM Limited Warranty v4) |
| Made in | Estonia |
| Brand | HUUM |
|---|---|
| Catalog Product | HUUM CORE Electric Sauna Heater with Alder Exterior | Black or Stainless Inlay, 6.5-10.5 kW |
| Heater Type | Electric sauna heater |
| Model Number | 6.5 kW / 240 V / 1 phase: CORE ST ALDER 6; 6.5 kW / 240 V / 1 phase: CORE BK ALDER 6; 9 kW / 240 V / 1 phase: CORE ST ALDER 9; 9 kW / 240 V / 1 phase: CORE BK ALDER 9; 10.5 kW / 240 V / 1 phase: CORE ST ALDER 11; 10.5 kW / 240 V / 1 phase: CORE BK ALDER 11 |
| SKU / Part Number | CORE ALDER |
| Maximum Room Volume | 6.5 kW / 240 V / 1 phase: 318 ft³; 9 kW / 240 V / 1 phase: 460 ft³; 10.5 kW / 240 V / 1 phase: 566 ft³ |
|---|---|
| Minimum Room Volume | 6.5 kW / 240 V / 1 phase: 177 ft³; 9 kW / 240 V / 1 phase: 283 ft³; 10.5 kW / 240 V / 1 phase: 354 ft³ |
| Minimum Circuit | 6.5 kW / 240 V / 1 phase: 30 A; 9 kW / 240 V / 1 phase, 10.5 kW / 240 V / 1 phase: 50 A |
|---|---|
| Phase | 1 phase |
| Rated Current | 25 A (6.5 kW), 37.5 A (9 kW), 43.75 A (10.5 kW) |
| Rated Power | 6.5 kW / 240 V / 1 phase: 6.5 kW; 9 kW / 240 V / 1 phase: 9 kW; 10.5 kW / 240 V / 1 phase: 10.5 kW |
| Supply Voltage | 240 V |
| Wire Size | 10 AWG (6.5 kW), 8 AWG (9 and 10.5 kW) |
| Assembled Dimensions | 15.16"W x 15.16"D x 32.7"H |
|---|---|
| Heater Depth | 15.16 in |
| Heater Height | 32.68 in |
| Heater Weight | 41.9 lb |
| Heater Width | 15.16 in |
| Minimum Host-Room Height | 80 in |
| Product Weight | 41.9 lbs |
| Ceiling-Clearance Reference Height Above Finished Floor | 32.68 in |
|---|---|
| Ceiling-Clearance Reference Plane | Top Of Rocks |
| Clearance to Floor | 0.98 in |
| Combustible Perimeter Clearance | 1.97 in |
| Minimum Spacing from Adjacent Surfaces | 1.97 in |
| Top of Rocks Above Finished Floor | 32.68 in |
| Included Components | Sauna Heater, Adjustable Legs (4), Unfinished Metal Shields (4), Cover Strips (4), Wood Panels (4), Cover Strip Fastening Screws, Wood Panel Fastening Screws, Installation and Operation Manual |
|---|---|
| Required, Not Included | HUUM UKU control and 88.2 lb of 2 to 4 in sauna stones (3 × 33 lb boxes) |
| Certifications & Listings | CE |
|---|
| Residential Warranty | 3-Year Limited Residential Warranty and 1-Year Limited Commercial Warranty (Excluding Elements) |
|---|
Use the attached current manual and a qualified installer for final sizing, wiring, clearances, venting, and local-code compliance.
An electric sauna heater that heats the room and stone mass for traditional löyly. Treat the heater, control, electrical supply, clearances, ventilation, and stones as one installation system.
Complete the system with these items.
Model-specific replacements and compatible system components.
Compare these options; sizing, power, controls, clearances, and stones may differ.
Current installation and operation manual for the UKU 4.2 controllers sold by Sauna Marketplace. Owners of older UKU 4.1 controllers should use the legacy manual that matches their installed hardware.
Current official HUUM US manual, verified by Sauna Marketplace on 2026-08-08. Applies to the current CORE manual generation.
Current official HUUM limited warranty terms linked from HUUM's U.S. warranty page and verified by Sauna Marketplace on 2026-08-08.
Current US HUUM replacement-element matrix. HIVE Mini 6 uses three SP0008 2.0 kW elements; HIVE Mini 9 uses three SP0009 3.0 kW elements; HIVE Mini 11 uses three SP0010 3.5 kW elements.
Use these only when the document revision matches the installed product.
Legacy manual for existing UKU 4.1 installations only. Sauna Marketplace now sells UKU 4.2. For a new controller, use the UKU 4.2 manual.
Archived by Sauna Marketplace; retained for installed-base and historical-link support.
3D Studio
Turn it, zoom in and look at it from every side.
Design in 3DOpens the 3D view in the gallery above.
Every new complete HUUM UKU controller ordered from Sauna Marketplace ships as the latest UKU 4.2, on its own or with a HUUM heater package.
The guarantee applies to new complete control systems. A controller is included only when your selected package says so. Replacement parts retain their own model and generation requirements; wood-burning stoves do not use UKU.
See UKU 4.2 controls →Every new complete HUUM UKU controller ordered from Sauna Marketplace ships as the latest UKU 4.2, on its own or with a HUUM heater package.
The included bench sensor measures temperature and humidity, adding a second view of sauna conditions alongside the required safety sensor above the heater. HUUM recommends installing the optional bench sensor high on the wall opposite the heater, 5 29/32 inches below the ceiling. Follow the U.S. UKU 4.2 manual for the exact installation.
Local or Wi-Fi? Local runs the sauna from the wall panel. Wi-Fi adds remote control through the HUUM app. Choose the package and panel finish that suit your sauna.
The guarantee applies to new complete control systems. A controller is included only when your selected package says so. Replacement parts retain their own model and generation requirements; wood-burning stoves do not use UKU.
See UKU 4.2 controls →
The heaters people shopping on our site weighed against the HUUM CORE, side by side. Rows that differ are marked in orange.
Swipe the table to see all 4 →
| Heater |  This heaterHUUM CORE | HUUM HIVE MiniHolds 331 lb of stones |  HUUM CLIFFHolds 165 lb of stones |  Harvia VirtaCosts $1,200 less |
|---|---|---|---|---|
| Price | From $4,384 | From $4,626 | From $4,071 | From $3,176 |
| Price includes | Ready to run with UKU Wi-Fi and stones | Ready to run with UKU Wi-Fi and stones | Ready to run with UKU Wi-Fi and stones | Ready to run with the Xenio control and stones |
| Rated for rooms of | 177 to 566 cu ft | 177 to 566 cu ft | 106 to 566 cu ft | 177 to 494 cu ft |
| Power | 6.5, 9, 10.5 kW | 6, 9, 10.6 kW | 3.5, 6, 9, 10.5 kW | 6, 8, 9 kW |
| Power supply | 240 V single-phase, 208 V single-phase | 240 V single-phase, 208 V single-phase | 240 V single-phase, 208 V single-phase | 240 V single-phase |
| Controls | Wall control | Wall control | Wall control | Wall control |
| Start from a phone | Yes, Wi-Fi control | Yes, Wi-Fi control | Yes, Wi-Fi control | Yes, Wi-Fi control |
| Mounting | Floor | Floor | Floor, Wall | Floor |
| Stones | 88 lb | 331 lb | 132 to 165 lb | 110 lb |
| Ceiling height | At least 6 ft 8 in | At least 6 ft 5 in | At least 7 ft 3 in | At least 6 ft 3 in, up to 7 ft 6 in |
| Warranty | 3 years | 3 years | 3 years | 2 years |
| Made in | Estonia | Estonia | Estonia | Finland |
| Open | See the HUUM HIVE Mini | See the HUUM CLIFF | See the Harvia Virta |
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Prebuilt
Brushes, Whisks and Body Care
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