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HUUM CLIFF 6 CLIFF Series 6kW Sauna Heater

by HUUM
Save $452.00 Save $452.00
Original price $2,799.00
Original price $2,799.00 - Original price $2,799.00
Original price $2,799.00
Current price $2,347.00
$2,347.00 - $2,347.00
Current price $2,347.00
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Voltage Phase: 240V/1PH (Home Use)
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HUUM CLIFF 6 CLIFF Series 6kW Sauna Heater

The HUUM CLIFF 6 is a 6kW floor-mounted electric sauna heater for rooms from 176 to 353 cubic feet - HUUM's slimmest and narrowest floor-standing electric heater, and the only model in the HUUM lineup with a minimalist open cage structure made from the recycled cutouts of the STEEL heater manufacturing process. At 10.6"W x 6.3"D x 38.4"H, the CLIFF 6 is narrower and shallower than the STEEL 6 (12.6"W x 12.6"D), and its side clearances of 2.36" (6 cm) from combustible materials make it the most compact floor installation in the HUUM electric lineup. The CLIFF's distinctive cage design - described by HUUM's authorized dealers as inspired by the sheer rock cliffs of Estonia's landscape and winner of design awards - holds 165 lbs of rounded olivine sauna stones (5 boxes, 3-5 cm, sold separately) with removable rib slats for precise, accurate stone stacking. An internal air duct increases heating speed by up to 25%. The UKU Local or UKU Wi-Fi controller is required and sold separately. No UKU Extension Box is needed for the 6kW model. 240V/1PH, 30A, 10AWG. Max 230°F. SGS certified. 5-year limited warranty (excluding elements). Designed and made in Estonia by HUUM.

CLIFF design - recycled steel cage, inspired by Estonian rock cliffs

The CLIFF's cage is not simply a design choice - it has a material story behind it. HUUM's authorized dealers describe it precisely: the minimalist steel cage is made from the recycled cutouts of the HUUM STEEL heater, eliminating material waste to celebrate the nature that inspires the award-winning design. Every CLIFF cage is fabricated from the steel that was removed during STEEL heater manufacturing, turning a production byproduct into a structural and aesthetic feature. The CLIFF's form draws from the vertical, striated profile of the rock cliff faces that HUUM's team encountered in the Estonian landscape - a slim, tall profile with visible structural lines. The result is a heater that authorized dealers consistently describe as looking exceptional in a sauna room and winning design awards for the combination of material story, visual simplicity, and functional purpose.

Removable rib slats - precise stone stacking, no air gaps

A practical feature unique to the CLIFF within the HUUM electric lineup is its removable rib slats. The rib slats can be removed individually to allow more accurate stacking of the sauna stones within the cage structure. Two prop blocks are included with the heater specifically to assist with removing the rib slats during stone loading. This enables the bather or installer to arrange the stones with fewer air gaps and a tighter, more intentional stack - maximizing the stone-to-volume ratio within the CLIFF's open cage and producing more consistent heat distribution and steam quality. Dealers recommend using rounded 3-5 cm olivine stones in the CLIFF to complement the open cage design aesthetically and achieve the mildest possible steam quality from the stone mass.

10.6" wide and 6.3" deep - the narrowest floor heater in the HUUM lineup

The CLIFF 6's 10.6"W x 6.3"D footprint is the slimmest floor heater profile in the HUUM electric lineup. Compared to the STEEL 6's 12.6"W x 12.6"D, the CLIFF 6 is 2" narrower and 6.3" shallower - a substantial difference in a compact sauna room where the stove-to-bench clearance determines how much usable bench space is available. The CLIFF Series also includes a wall-mounted 4kW Mini model for even smaller rooms. Safety clearances of 2.36" (6 cm) at the sides - along with the Reflect C reflector panel accessory (sold separately) that can halve those distances further - give the CLIFF 6 the most compact combined footprint-plus-clearance profile of any HUUM electric floor heater. At 30A/10AWG with the same electrical specification as the STEEL 6, the CLIFF 6 requires no different electrical preparation than the STEEL platform.

6kW floor-mounted electric sauna heater for rooms from 176 to 353 cubic feet. CLIFF Series - narrowest floor heater in HUUM lineup: 10.6"W x 6.3"D x 38.4"H. Minimalist open steel cage made from recycled STEEL heater cutouts. Award-winning design inspired by Estonian rock cliffs. Removable rib slats for precise stone stacking. Internal air duct - heats up to 25% faster. Side clearances: 2.36" (6 cm). 165 lbs stones required (5 boxes, 3-5 cm rounded olivine, sold separately). UKU Local or UKU Wi-Fi controller required - sold separately. No UKU Extension Box required for 6kW. Max temperature 230°F. 240V/1PH - 30A - 10AWG. Optional: Rail C safety railing, Reflect C reflector panel (halves clearances), Flange CS bench embedding. Pallet delivery - scheduled freight required. SGS certified. 5-year limited warranty (excluding elements). Designed and made in Estonia by HUUM.
6 kW 176 to 353 cu ft CLIFF Series - narrowest floor heater in HUUM lineup 10.6"W x 6.3"D x 38.4"H Open steel cage - recycled STEEL heater cutouts Award-winning design - inspired by Estonian rock cliffs Removable rib slats - precise stone stacking Internal air duct - 25% faster heat-up Side clearances: 2.36" (6 cm) 165 lbs stones required (5 boxes, 3-5 cm rounded olivine) UKU controller required - sold separately No UKU Extension Box required for 6kW Max temperature 230°F 240V/1PH - 30A - 10AWG Optional Reflect C - halves clearances Optional Rail C safety railing Optional Flange CS bench embedding SGS certified 5-year limited warranty (excl. elements) Designed and made in Estonia by HUUM

Specifications

Performance

Power output 6 kW
Fuel type Electric (240V/1PH)
Room volume 176 to 353 cu ft (5-10 m3)
Max temperature 230°F (110°C)
Stone capacity 165 lbs / 75 kg (5 boxes, 3-5 cm rounded olivine) - sold separately
Stone size 3-5 cm rounded olivine (1-2 in)
Air duct benefit Heats up to 25% faster

CLIFF cage and stone features

Cage design Open minimalist steel cage - stones visible
Cage material origin Made from recycled cutouts of STEEL heater manufacturing
Removable rib slats Yes - for precise and accurate stone stacking
Prop blocks included 2 prop blocks for rib slat removal
Stone visibility Open cage - full stone mass visible inside sauna

Safety distances (combustible materials)

Sides (A) 2.36 in (6 cm)
Front (B) 16.5 in (419 mm)
With Reflect C panel Side distances can be halved (optional accessory)
CLIFF 6 vs STEEL 6 side clearances CLIFF 6: 2.36 in (6 cm) | STEEL 6: 2.0 in (5 cm)

Electrical

Voltage / phase 240VAC, 1-phase, 60Hz
Circuit breaker 30A
Wire size 10AWG
UKU Extension Box Not required (only needed for 10.5kW+ models)
Certification SGS certified

Physical dimensions

Width 10.6 in (270 mm)
Depth 6.3 in (160 mm)
Height 38.4 in (975 mm)
Installation Floor-mounted
Delivery Scheduled pallet freight - appointment required

CLIFF 6 vs STEEL 6 - dimension comparison

Height (both) 38.4 in (975 mm) - identical
Width - CLIFF 6 10.6 in (270 mm)
Width - STEEL 6 12.6 in (320 mm)
Depth - CLIFF 6 6.3 in (160 mm)
Depth - STEEL 6 12.6 in (320 mm)
Stone capacity - CLIFF 6 165 lbs (5 boxes)
Stone capacity - STEEL 6 330 lbs (10 boxes)
Cage design CLIFF: open recycled-steel cage | STEEL: enclosed cavity

Controller (required - sold separately)

Compatible controllers UKU Local | UKU Wi-Fi | UKU Glass | UKU Mirror | UKU Gold
UKU Local Physical panel - temperature, timer, safety features
UKU Wi-Fi Physical panel + HUUM mobile app remote control
UKU safety features Door sensor, overheating protection, child safety lock

Certifications, warranty, and optional accessories

Certifications SGS certified
Origin Designed and made in Estonia by HUUM
Warranty 5-year limited warranty (excluding elements)
Safety railing Rail C (CLIFF-specific, light wood profiles) - sold separately
Reflector panel Reflect C (CLIFF-specific, halves side clearances) - sold separately
Bench embedding Flange CS (CLIFF-specific) - sold separately

What's included

HUUM CLIFF 6 6kW floor-mounted electric sauna heater with open recycled-steel cage
2 prop blocks for rib slat removal during stone loading
Installation and operation manual
5-year limited warranty (excluding elements)

Required (not included): 165 lbs sauna stones (5 boxes, 3-5 cm rounded olivine - an additional box is recommended); HUUM UKU controller (Local or Wi-Fi). No UKU Extension Box is required for the 6kW model. Optional accessories (sold separately - CLIFF-specific): Rail C safety railing; Reflect C reflector panel (halves side clearances); Flange CS bench embedding. A licensed electrician is required for all wiring: 240V/1PH, 30A circuit breaker, 10AWG wire.


Why the HUUM CLIFF 6 stands out

Recycled steel cage - material story as design feature

The CLIFF cage is fabricated from the recycled cutouts produced during STEEL heater manufacturing. HUUM's own description of the intent: eliminating material waste to celebrate the nature that inspires the award-winning design. Every CLIFF in the market was made from material that would otherwise have been production scrap, and the cage structure makes this material origin visible. The open-cage format showcases the stones inside the sauna room rather than concealing them - the stones become a visual element of the sauna interior rather than a hidden functional component. For a buyer who cares about the material story of their heater alongside its performance, the CLIFF is the only HUUM heater with this specific provenance.

Narrowest floor heater in the HUUM lineup - 10.6"W x 6.3"D

At 10.6" wide and 6.3" deep, the CLIFF 6 is the narrowest and shallowest floor heater HUUM produces. The STEEL 6 is 12.6" wide and 12.6" deep - twice the depth and nearly 2" wider. For a compact sauna room where the combination of heater width, depth, and side clearances directly determines how much bench space is available alongside the stove, the CLIFF 6 occupies the smallest floor area of any HUUM floor heater. The optional Reflect C reflector panel further reduces the side clearances from 2.36" to approximately half, making the effective combined footprint even more compact in tight sauna layouts.

Removable rib slats - better stone loading than any enclosed heater

The CLIFF's open cage with removable rib slats allows the stones to be loaded and stacked with precision that an enclosed heater cavity simply cannot offer. The rib slats can be individually removed using the included prop blocks, and stones can be arranged to minimize air gaps and maximize the stone-to-volume ratio within the cage. HUUM's description of the benefit: more accurate stacking of stones. A tighter stone arrangement with fewer air gaps produces more consistent heat distribution through the stone mass and more even steam production across the stone surface. Two prop blocks are included with every CLIFF 6 specifically for this purpose.

Award-winning design - Estonian rock cliff aesthetic

The CLIFF's visual identity draws from Estonia's landscape - specifically from the vertical, striated profile of the country's distinctive limestone and sandstone cliff faces. The heater's tall, slim profile with visible structural lines is a direct translation of that landscape reference into a functional product. Authorized dealers describe the CLIFF as one of HUUM's most striking heaters in a sauna interior - and the award recognition the design has received reflects the combination of design discipline, material story, and functional simplicity that the CLIFF achieves. The open cage, visible stones, and slim profile make it a heater that is designed to be noticed as part of the sauna room rather than simply serving as a utilitarian appliance within it.

165 lbs of stones and 25% faster heat-up

The CLIFF 6 holds 165 lbs of rounded 3-5 cm olivine stones (5 boxes) in its open cage. The internal air duct channels air through the stone mass to increase heating speed by up to 25% versus heaters without an air tunnel. For a 6kW heater in a 176-353 cu ft room, both the stone capacity and the faster heat-up translate directly to session quality: 165 lbs of stones sustain consistent heat and steam through the full session, and the faster heat-up reduces the time from switch-on to bathing temperature. HUUM recommends rounded olivine stones in the CLIFF specifically to complement the open-cage design and produce the mildest, most pleasant steam quality from the visible stone mass.

CLIFF Series - 6kW floor and CLIFF Mini 4kW wall models

The H1004012 is the 6kW floor-standing configuration of the HUUM CLIFF Series. The CLIFF Series also includes a CLIFF Mini (4kW, wall-mounted, for even smaller sauna rooms - HUUM describes it as an even slimmer model particularly suitable for very small sauna rooms). The CLIFF 9 and CLIFF 10.5 are larger output floor models for bigger rooms - those models require 9.45" (24 cm) side clearances and the CLIFF 10.5 requires the UKU Extension Box. The CLIFF-specific optional accessories - Rail C safety railing, Reflect C reflector panel, and Flange CS bench embedding flange - are designed specifically for the CLIFF platform and differ from the equivalent STEEL accessories. Designed and made in Estonia by HUUM. We are an authorized HUUM dealer.


About HUUM

HUUM CLIFF 6 H1004012 6kW floor electric sauna heater 176-353 cu ft 165 lbs stones open recycled cage 10.6 inch wide award-winning design
Designed in Estonia - SGS Certified - CLIFF Series - Award-Winning Design

HUUM CLIFF 6. 6kW. 176-353 cu ft. 10.6"W x 6.3"D. 165 lbs stones. Recycled open cage.

HUUM is an Estonian sauna heater company. The CLIFF 6 is a 6kW floor heater with a minimalist open steel cage made from recycled STEEL heater cutouts - the narrowest floor heater in the HUUM lineup at 10.6"W x 6.3"D, with removable rib slats for precise stone stacking, 2.36" side clearances, and an award-winning design inspired by Estonian rock cliffs. UKU controller and 165 lbs stones (5 boxes, 3-5 cm) required and sold separately. No UKU Extension Box required. Pallet delivery. We are an authorized HUUM dealer.

  • 6kW electric - 176-353 cu ft - CLIFF Series narrowest floor heater
  • 10.6"W x 6.3"D - open recycled-steel cage - removable rib slats
  • 165 lbs stones required (5 boxes, 3-5 cm) - internal air duct 25% faster
  • 2.36" side clearances - award-winning Estonian rock cliff design
  • UKU controller required (no Extension Box) - 30A - 10AWG - SGS certified
CLIFF 6 vs STEEL 6 vs STEEL Mini 4 - HUUM compact electric heater comparison

HUUM CLIFF 6 vs STEEL 6 vs STEEL Mini 4 - slim floor heater selection guide

Three compact HUUM electric heaters cover the small to medium home sauna range. HUUM STEEL Mini 4 H1007012: 3.5kW, 106-177 cu ft (adjusted), wall-mounted, 12.6"W x 6"D, 132 lbs stones (4 boxes, 3-5 cm), 2.5" side clearances, 15A/14AWG, open-air design. Right for the smallest sauna rooms with wall mounting. HUUM CLIFF 6 H1004012 (this listing): 6kW, 176-353 cu ft, floor-standing, 10.6"W x 6.3"D, 165 lbs stones (5 boxes, 3-5 cm), 2.36" side clearances, open recycled-steel cage, removable rib slats, award-winning design, 30A/10AWG. Right when the CLIFF's narrow floor footprint, open cage design, material story, and 6kW output for the 176-353 cu ft range are the specification. HUUM STEEL 6 H1006012: 6kW, 212-353 cu ft, floor-standing, 12.6"W x 12.6"D, 330 lbs stones (10 boxes, 3-5 cm), 2" side clearances, enclosed cavity, 30A/10AWG. Right when maximum stone capacity (330 lbs vs CLIFF's 165 lbs) and the square-pillar STEEL format are the priority at the same 6kW output. Choose the CLIFF 6 for the 176-353 cu ft range where the narrowest floor footprint, open cage, recycled material story, and CLIFF Series design are the right specification.

HUUM CLIFF 6 narrow open cage vs STEEL 6 enclosed cavity vs STEEL Mini 4 wall-mounted compact electric sauna heater comparison

Manuals and Documents

Installation and Operation Manual
Installation and Operation Manual (PDF)
Element Requirements
Element Requirements (PDF)
Stone Requirements
Stone Requirements (PDF)
Certificate of Compliance
Certificate of Compliance (PDF)
Size Your Sauna
Size Your Sauna (PDF)

Warranty

5-year limited warranty (excluding elements)

The HUUM CLIFF 6 carries HUUM's 5-year limited warranty from the date of purchase. The warranty covers defects in manufacturing and materials under normal use and maintenance conditions. Heating elements are excluded from the 5-year term and carry a separate warranty period per the warranty document. The warranty does not cover damage caused by improper installation, failure to follow the installation and operating guidelines, use of incorrect stone type or size (decorative stones must not be used as they can break under heat; use only rounded olivine 3-5 cm in the CLIFF 6), operating without the required stone load, or damage from inadequate electrical installation. HUUM recommends rounded olivine stones in the CLIFF to complement the open-cage design and achieve milder steam. Proof of purchase from an authorized HUUM dealer is required for warranty claims. We are an authorized HUUM dealer.

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