HUUM CORE Alder CORE Series Sauna Heater, Alder Wood Exterior, Up to 10.5kW
The HUUM CORE Alder is a floor-standing electric sauna heater with an alder wood exterior cladding, available up to 10.5kW. This listing is the heater only. A compatible UKU control unit and sauna stones are sold separately. The CORE is HUUM's distinctive wood-clad heater series - a stainless steel open stone basket surrounded by natural wood panels that give the heater the warmth and texture of a timber sauna element rather than a metal appliance. The Alder variant uses alder wood for its exterior cladding - a lighter, fine-grained Nordic hardwood with a warm pale tone that integrates naturally with light-wood sauna interiors. The CORE Alder Package listing at BathingBrands bundles the heater with a UKU control and stones for a complete single purchase.
The CORE design - stainless basket, natural wood exterior
The HUUM CORE heater combines an open stainless steel stone basket with natural wood panels on the exterior sides. The stones are visible through the open basket structure and the wood cladding wraps the sides of the heater, presenting a warm natural wood face to the sauna room rather than the bare metal of a conventional electric heater. The result is a heater that reads as a wood-and-stone element - visually consistent with the natural timber and stone materials of a traditional sauna interior - while delivering the precision control and efficiency of a modern electric heater with UKU app connectivity. The open basket allows direct stone-to-element contact throughout the full stone load for even heat distribution, and water ladled onto the stones produces soft, consistent steam from stones at multiple temperature levels throughout the basket depth.
Alder wood cladding - the lightest CORE exterior
The CORE series offers multiple wood species for the exterior cladding: Black (painted black finish), alder, thermo-aspen, and aspen. Alder is the lightest and most neutral-toned of the natural wood options - a pale, fine-grained wood with a warm creamy tone that suits sauna rooms with light Nordic timber, white or light grey tile, and pale stone interiors. Where thermo-aspen has the deep brown warmth of thermally modified wood and aspen has the lighter natural softwood tone, alder occupies the mid-warm neutral position - a natural wood look without the golden-yellow tones of some other species. For sauna rooms designed around a light, airy Nordic aesthetic where the heater should feel like a natural wood element without adding warmth to the colour palette, the CORE Alder is the appropriate finish choice in the CORE family.
Up to 10.5kW - output selected at purchase
The CORE series is available in multiple output configurations up to 10.5kW. The specific output selected determines the room coverage and electrical specification. UKU control (Local Black or WiFi) and sauna stones are required for operation and sold separately at BathingBrands. The UKU Local Black provides on-site digital control of temperature, time, and safety functions. UKU WiFi adds HUUM app remote preheat, scheduling, and monitoring on iOS and Android. A compatible UKU Extension Box may be required depending on the output level selected - confirm with the control unit specifications. A licensed electrician is required for all electrical connections. Do not connect to a GFI/GFCI breaker.
Floor-standing electric sauna heater with alder wood exterior cladding. Up to 10.5kW. Open stainless steel stone basket with natural alder wood side panels. Natural wood aesthetics - lighter neutral tone, warm pale alder grain. Control (UKU Local Black or WiFi) and sauna stones sold separately. SGS Listed. 5-year warranty (elements excluded). Made in Estonia by HUUM. See CORE Alder Package listing for complete bundled purchase.
Up to 10.5 kW Alder wood exterior cladding Open stainless steel stone basket Natural wood aesthetics - lighter neutral tone Floor-standing UKU control sold separately Stones sold separately CORE Alder Package available - bundled purchase SGS Listed 5-year warranty (elements excluded) Made in Estonia by HUUM
Specifications
Electrical
| Maximum output |
Up to 10.5 kW |
| Voltage |
240V / 1-phase or 3-phase |
| Control included |
No - UKU Local Black or WiFi sold separately |
| Certification |
SGS Listed |
Stones and room sizing
| Stones included |
No - sold separately |
| Stone specification |
See Stone Requirements document below |
| Room coverage |
Determined by output level selected |
Design
| Exterior cladding |
Alder wood panels |
| Tone |
Pale warm neutral - lighter than thermo-aspen or aspen |
| Stone basket |
Open stainless steel - stones visible on all sides |
| Mounting |
Floor-standing |
| Origin |
Made in Estonia by HUUM |
CORE wood exterior options
| CORE Black |
Painted black finish |
| CORE Alder (this listing) |
Pale warm neutral alder wood |
| CORE Thermo-Aspen |
Deep brown thermally modified aspen |
| CORE Aspen |
Light natural aspen softwood |
| All variants |
Same stainless basket, open design, up to 10.5kW |
Warranty
| Warranty period |
5 years (elements excluded) |
| SKU |
CORE6-ALD-SS |
What's included
HUUM CORE Alder floor-standing sauna heater with alder wood exterior cladding
Installation and operation manual
Required (not included): UKU control unit (Local Black or WiFi, sold separately at BathingBrands); sauna stones (sold separately - see Stone Requirements document). A UKU Extension Box may also be required depending on the output level - confirm with control specifications. A licensed electrician is required. Do not connect to a GFI/GFCI breaker.
Why the HUUM CORE Alder stands out
Alder wood exterior - pale, warm, and neutral
Alder wood brings a pale, fine-grained natural wood texture to the CORE exterior - warmer than raw metal but lighter than thermo-aspen or darker wood species. In sauna rooms with light Nordic timber, pale tile, or white and grey stone surfaces, alder's neutral warm tone integrates as a natural material element that complements the palette without introducing strong colour contrast.
Open stone basket - natural wood and stone visible
The CORE's open stainless steel basket allows the stones to be visible through the structure on all sides, with the alder wood panels framing the stone mass. The visual combination of natural wood exterior and visible stone interior gives the heater the character of a wood-and-stone sauna element rather than a metal appliance - consistent with the natural materials of a traditional Nordic sauna room.
Up to 10.5kW - versatile output range
The CORE Alder is available up to 10.5kW, covering a wide range of sauna room sizes depending on the output configuration selected. The specific output determines the room coverage, electrical requirements, and whether a UKU Extension Box is needed. Confirm the output level and corresponding electrical specification before ordering - and check the Size Your Sauna document below for room sizing guidance.
UKU WiFi compatible - HUUM app remote preheat
The CORE Alder is compatible with both UKU Local Black (on-site digital control) and UKU WiFi (HUUM app remote preheat, scheduling, and monitoring on iOS and Android). Both control variants are sold separately at BathingBrands. The UKU WiFi option is recommended for regular sauna users who want the convenience of starting the sauna remotely before arriving.
CORE Alder Package - complete bundled option
For a single purchase that includes the heater, UKU control, and stones, the CORE Alder Package listing at BathingBrands bundles all required components together. The standalone heater listing here is for buyers sourcing the heater separately - replacing a heater in an existing CORE installation, completing a multi-component order, or pairing with a specific control already on hand.
SGS Listed - 5-year warranty - made in Estonia
The HUUM CORE Alder is SGS Listed for safety compliance and manufactured in Estonia by HUUM, whose heaters are used in sauna installations across North America and Europe. The 5-year limited warranty covers defects in manufacturing and materials under normal use conditions, with heating elements carrying their own separate warranty period.
About HUUM
Made in Estonia - SGS Listed
HUUM CORE Alder. Up to 10.5kW. Alder wood exterior. Open stone basket. UKU compatible.
HUUM is an Estonian sauna heater company. The CORE Alder is HUUM's floor-standing heater with alder wood exterior cladding - an open stainless steel stone basket framed by natural alder wood panels for a warm, neutral Nordic aesthetic in the sauna room. This listing is the heater only. UKU control (Local Black or WiFi) and sauna stones are required and sold separately at BathingBrands. See the CORE Alder Package for a complete bundled purchase. We are an authorized HUUM dealer.
-
Alder wood exterior cladding - pale warm neutral tone
-
Open stainless steel stone basket - stones visible all sides
-
Up to 10.5kW - multiple output configurations available
-
UKU Local Black or WiFi compatible - both sold separately
-
Stones sold separately - CORE Alder Package also available
Manuals and Documents
Warranty
5-year limited warranty (elements excluded)
The HUUM CORE Alder is covered by HUUM's 5-year limited warranty 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, 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 for all electrical connections. Do not connect to a GFI/GFCI breaker. Proof of purchase from an authorized HUUM dealer is required. We are an authorized HUUM dealer.
