HUUM CLIFF 6STU Pkg CLIFF Series 6kW Sauna Heater Package
The HUUM CLIFF 6STU Package is a complete sauna heater package for rooms from 177 to 318 cubic feet, including the CLIFF 6kW floor-standing heater, UKU sauna control (Local Black or WiFi - selected at checkout), and 165 lbs of rounded olivine diabase sauna stones (5 boxes). The CLIFF 6 is the entry model in the CLIFF floor-standing series - the same Red Dot Award-winning natural stone surface exterior, the same slender tower profile, the same integrated air duct, and the same removable stone basket ribs as the CLIFF 9 and CLIFF 11, now for the smaller 177-318 cu ft room range on a standard 30A / 10 AWG residential circuit. No UKU Extension Box is required at 6kW. The CLIFF 6 is the most electrically accessible model in the CLIFF floor-standing series.
Natural stone surface - the CLIFF aesthetic at 6kW
The CLIFF heater is distinguished from every other HUUM model by its natural stone exterior surface - not a stone-textured coating, but actual natural stone panels that cover the slender tower body and give the heater the visual character of a Nordic cliff face. The Red Dot Award-winning design principle is that the heater should be a stone element in the sauna room, not an appliance. This aesthetic is fully present at 6kW: the same natural stone exterior, the same slim rectangular profile, and the same minimal wall clearances as the larger CLIFF models, now in the output range appropriate for rooms from 177 to 318 cubic feet. For buyers who want the CLIFF's distinctive look in a smaller sauna room - a personal home sauna, a single-bench cabin, or a compact two-person room - the CLIFF 6STU Package delivers it on a standard 30A circuit.
165 lbs of stone and removable ribs - the CLIFF basket design
The CLIFF 6 carries 165 lbs (5 boxes) of rounded olivine diabase stones in 1"-2" (3-5 cm) size - the CLIFF-specific smaller stone specification that fits the narrow tower basket geometry. This smaller stone size is different from the 2"-4" stones used in the DROP, HIVE, and STEEL series. Using oversized stones in the CLIFF basket restricts airflow and can damage the heating elements. The 5 boxes of 1"-2" rounded olivine included in this package are the correct specification. The removable basket ribs make loading 165 lbs of stones into the narrow CLIFF tower more practical - the ribs can be removed to access the basket interior for precise stone placement, then reinstalled. The integrated internal air duct speeds up heating by approximately 25% by directing airflow efficiently through the stone mass from switch-on.
CLIFF 6 vs DROP 6 vs STEEL 6 vs HIVE Mini 6 - the 177-318 cu ft choice
Four HUUM heaters cover the 177-318 cu ft room range on a 30A / 10 AWG circuit. The DROP 6 is wall-mounted with 122 lbs of stones in a water-droplet form. The STEEL 6 is a floor-standing brushed stainless tower with 330 lbs of stones and 2" wall clearances. The HIVE Mini 6 is a floor-standing 18.11" beehive cage with 330 lbs of stones. The CLIFF 6 is a floor-standing natural stone surface tower with 165 lbs of stones and 2" wall clearances. All four run on the same 30A / 10 AWG circuit. The choice between them is mounting style, stone mass, and exterior aesthetic. The CLIFF 6 is the correct choice when a floor-standing heater with natural stone aesthetics, minimal clearances, and CLIFF's specific stone tower form is the priority in this room range.
Complete 6kW floor-standing sauna heater package for rooms from 177 to 318 cubic feet. Includes CLIFF 6kW heater, UKU control (Local Black or WiFi - select at checkout), and 165 lbs of rounded olivine diabase stones (5 boxes). Natural stone surface exterior - Red Dot Award-winning design. Slender tower - minimal safety clearances. Internal air duct - 25% faster heat-up. Removable ribs for precise stone loading. 165 lbs stone capacity - 1"-2" rounded olivine (CLIFF-specific size). No UKU Extension Box required. Single 30A breaker, 10 AWG wire. 240V / 1-phase. Max 230°F. SGS Listed. 5-year warranty (elements excluded). Made in Estonia by HUUM.
Complete package - control + 165 lbs stones included 6 kW 177 to 318 cu ft Natural stone surface exterior - Red Dot Award design Slender floor-standing tower Minimal safety clearances 165 lb stone capacity - 5 boxes included 1"-2" rounded olivine - correct CLIFF stone size Internal air duct - 25% faster heat-up Removable ribs for precise stone loading No UKU Extension Box required UKU Local Black or UKU WiFi - select at checkout Single 30A breaker - 10 AWG - 240V 1-phase SGS Listed - made in Estonia 5-year warranty (elements excluded)
Specifications
Electrical
| Power output |
6 kW |
| Voltage |
240V / 1-phase / 60 Hz |
| Amperage draw |
25 A |
| Circuit breaker required |
Single 30A (standard 2-pole - no GFI/GFCI) |
| Wire gauge |
10 AWG |
| UKU Extension Box required |
No - not required for 6kW |
| Certification |
SGS Listed |
Room sizing and stones
| Room volume |
177 to 318 cu ft |
| Stone capacity |
165 lbs (5 boxes) |
| Stones included |
Yes - 5 boxes rounded olivine diabase |
| Stone size |
1" to 2" (3-5 cm) rounded - CLIFF-specific |
| Max temperature |
230°F (110°C) |
Design and installation
| Exterior surface |
Natural stone - Nordic cliff face aesthetic |
| Profile |
Slender vertical tower - floor-standing |
| Safety clearances |
Minimal - confirm in IOM for 6kW installation |
| Air duct |
Integrated internal - 25% faster heat-up |
| Stone loading |
Removable ribs for easier precise loading |
| Design award |
Red Dot Award winner |
| Origin |
Made in Estonia by HUUM |
Control options - select at checkout
| UKU Local Black |
Wall-mounted digital control - on-site operation |
| UKU WiFi |
Adds HUUM app remote preheat and scheduling |
| App |
HUUM app - iOS and Android (WiFi variant) |
| UKU Extension Box |
Not required for 6kW |
CLIFF series
| CLIFF 6kW (this listing) |
177-318 cu ft | 30A / 10 AWG | No ext box |
| CLIFF 9kW |
318-530 cu ft | 50A / 8 AWG | No ext box |
| CLIFF 11kW |
354-566 cu ft | 50A / 6 AWG | Ext box included |
| All CLIFF models |
Natural stone surface, 165 lbs stones, 1"-2" rounded olivine |
Warranty
| Warranty period |
5 years (elements excluded) |
| SKU |
534-BDL-CLIFF60STULB |
What's included
HUUM CLIFF 6kW floor-standing sauna heater - natural stone surface exterior
UKU sauna control (Local Black or WiFi - selected at checkout)
Rounded olivine diabase sauna stones - 5 boxes (165 lbs) - 1"-2" CLIFF size
Installation and operation manual
Optional accessories (sold separately): HUUM CLIFF safety railing (recommended), reflector panels (reduce wall clearances further), CLIFF embedding flange (for bench installation). A licensed electrician is required for all electrical connections.
Why the HUUM CLIFF 6STU Package stands out
Natural stone surface at 6kW - on a 30A circuit
The CLIFF 6 delivers the full natural stone exterior aesthetic of the CLIFF series on a standard 30A / 10 AWG residential circuit - the same electrical requirement as the DROP 6, STEEL 6, and HIVE Mini 6. For buyers who want the CLIFF's Red Dot Award-winning stone-face design in a smaller sauna room without requiring a heavier electrical installation, the CLIFF 6 is the entry point to the CLIFF floor-standing series.
Slender tower - minimal footprint and clearances
The CLIFF's slim rectangular tower profile takes up less floor space than round floor-standing heaters and installs with minimal wall clearances that allow placement in tight sauna room corners or end positions where wider heaters cannot fit without violating safety distances. The same CLIFF body dimensions and clearance advantages are present at 6kW as at 9 and 11kW.
165 lbs of stone - 1"-2" CLIFF specification
The CLIFF 6 carries 165 lbs of 1"-2" (3-5 cm) rounded olivine diabase stones - the CLIFF-specific smaller stone size that fits the narrow tower basket. This stone size is critical: using 2"-4" stones from other HUUM packages in the CLIFF basket restricts airflow and risks element damage. The 5 boxes of correct-specification stones are included. No separate stone sourcing is needed.
Removable ribs - easier stone loading
Loading 165 lbs of stones into a narrow slender tower basket is made practical by the CLIFF's removable internal basket ribs. The ribs can be removed to fully access the basket interior for precise stone placement, ensuring the correct loading pattern per the Stone Requirements document below, then reinstalled. Correct stone placement in the CLIFF is important for element life and steam quality.
Internal air duct - 25% faster heat-up
The integrated internal air duct reduces heat-up time by approximately 25% by directing airflow efficiently through the 165-lb stone mass from the first moment of the heating cycle. It also reduces thermal stress on the elements by improving airflow distribution during warm-up, extending element service life. For a 177-318 cu ft room at 6kW, the heat-up time saving means a shorter wait from switch-on to bathing temperature.
UKU WiFi - remote preheat
Upgrading to UKU WiFi at checkout adds HUUM app control on iOS and Android - remote preheat from anywhere, session scheduling, and temperature monitoring. No UKU Extension Box is required for the 6kW CLIFF. For a 177-318 cu ft room that heats in 20-35 minutes at 6kW, the WiFi option removes the need to be present at switch-on to enjoy a ready sauna.
About HUUM
Made in Estonia - Red Dot Award winner
HUUM CLIFF 6STU. 6kW. 177-318 cu ft. Natural stone surface. 165 lbs of stone. Standard 30A circuit.
HUUM is an Estonian sauna heater company. The CLIFF 6STU Package is the entry model in the CLIFF floor-standing series - the same Red Dot Award-winning natural stone exterior, slender tower profile, internal air duct, and removable basket ribs as the larger CLIFF models, for rooms from 177 to 318 cubic feet on a standard single 30A / 10 AWG circuit. No UKU Extension Box required. 165 lbs of 1"-2" rounded olivine stones included. UKU control (Local Black or WiFi at checkout) included. We are an authorized HUUM dealer.
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Complete package - CLIFF 6kW, UKU control, and 165 lbs 1"-2" rounded olivine stones
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6kW, 177-318 cu ft - single 30A / 10 AWG, 240V/1PH
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Natural stone surface - Red Dot Award design, Nordic cliff aesthetic
- 165 lbs stones, removable ribs, internal air duct
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No UKU Extension Box required - 5-year warranty (elements excluded)
CLIFF series - 6kW, 9kW, 11kW
CLIFF 6 vs CLIFF 9 vs CLIFF 11 - same natural stone design at three output levels
All three CLIFF floor-standing models share the same natural stone surface exterior, the same slender tower form, the same 165-lb stone capacity, the same 1"-2" (3-5 cm) rounded olivine stone specification, the same removable basket ribs, and the same integrated air duct. The differences are output, room range, and electrical specification. CLIFF 6kW: 177-318 cu ft, 30A / 10 AWG, no extension box. CLIFF 9kW: 318-530 cu ft, 50A / 8 AWG, no extension box. CLIFF 11kW: 354-566 cu ft, 50A / 6 AWG, UKU Extension Box required (included). The CLIFF 6 is the only CLIFF model on a standard 30A residential circuit. For rooms from 177-318 cu ft, it is the most electrically accessible CLIFF option. For rooms requiring more output, the 9kW or 11kW steps up in the same stone tower body.
Licensed electrician required. No GFI/GFCI. 1"-2" stones only - do not use 2"-4" stones from other HUUM packages. CLIFF safety railing recommended. Reflector panels and embedding flange sold separately.
Manuals and Documents
Warranty
5-year limited warranty (elements excluded)
The HUUM CLIFF 6STU Package 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 stone type or size (2"-4" stones must not be used - 1"-2" stones required), operating the heater 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.
