HUUM Cliff 6kW Review: The Best Sauna Heater for Compact Spaces

HUUM Cliff 6kW Sauna Heater and UKU wi-fi control device with a beautifully designed wooden sauna in the background, showcasing its sleek and modern design.

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When you think of sauna heaters, you probably imagine a utilitarian metal box tucked away in a corner. But imagine a heater that doesn’t just blend into the background—it stands out like a sculpture in a gallery.

Meet the HUUM Cliff 6kW, a piece of functional art designed to elevate your sauna and your spirits.

Engineered for efficiency, this model uses carefully recycled materials, ensuring every sauna session is as green as it is steamy. Winner of the Red Dot Award in 2021, this isn’t just a sauna heater—it’s a statement.

In this HUUM Cliff 6kW Review, I’ll break down what it’s like to use this heater and if it lives up to the hype.

Key Takeaways

TL;DR: For a quick verdict, jump straight to my Personal Experience and Verdict on the HUUM Cliff 6kW Sauna Heater.

  1. Design and Build: The HUUM Cliff 6kW boasts a beautiful natural stone surface and a sleek, slim profile, making it both a functional and aesthetic centerpiece for your sauna.
  2. Heating Efficiency: An internal air tunnel increases heating efficiency by 25%, ensuring your sauna heats up quickly and maintains consistent heat.
  3. Eco-Friendly: Crafted from recycled stainless steel offcuts, this heater is designed with sustainability in mind.
  4. Modern Controls: Equipped with UKU Wi-Fi control, you can manage your sauna settings conveniently via a mobile app.
  5. Installation and Setup: Requires a certified electrician for installation, which adds to the initial setup cost but ensures safety and compliance.
  6. User Experience: Users praise its quick heating, consistent heat levels, and the convenience of mobile app control despite its higher initial cost and specific stone requirements.

Overview of the HUUM Cliff 6kW Sauna Heater

The HUUM Cliff 6kW is not just a heater but the centerpiece of your wellness retreat. With its stunning natural stone surface that echoes the rugged beauty of Nordic cliffs, this model brings a touch of the natural world into your personal space.

Image Credit: Amazon

Designed with environmental consciousness at its core, the HUUM Cliff 6kW utilizes stainless steel offcuts, ensuring no material goes to waste. Its slim profile fits snugly in smaller saunas, while an internal air tunnel boosts heating efficiency by 25%, reducing wait times and extending element life.

I have rated this heater as the best Sauna heater for compact spaces in my roundup review article on the Best Sauna Heaters this year.

Ideal for those looking for both aesthetic appeal and functionality, the HUUM Cliff 6kW transforms any sauna into a sanctuary of health and relaxation, proving that good things come in sustainable, beautifully designed packages.

HUUM Cliff 6kW: Detailed Specifications

Country of ManufactureCrafted in Estonia, where tradition meets contemporary design
Brand ReputationHUUM has earned a reputation for leading innovations in modern sauna technology.
Power6 kW
Dimensions10.6 x 10.6 x 38.4 inches
Heater Weight35.2 lbs
Sauna Capacity176-353 cubic feet
Stone Capacity165.4 lbs
ControlsUKU Wi-Fi control
Safety DistancesMinimal due to slim and compact design
Heating Speed25% faster due to internal air tunnel
Model VariantsAlso available in 9 kW and 10.5 kW models
Warranty5 years (excludes heating elements)

Features & Pros of the HUUM Cliff 6kW Electric Sauna Heater

The HUUM Cliff 6kW isn’t just a sauna heater; it’s a testament to how innovation and aesthetics can enhance your sauna experience. Each feature is designed with both functionality and the user’s lifestyle in mind.

  1. Eco-Friendly Design: The HUUM Cliff 6kW is crafted from stainless steel offcuts from other manufacturing processes, ensuring minimal waste.
    • Pro: This sustainable approach reduces environmental impact while maintaining product durability and quality.
  2. Compact and Slim Profile: Its sleek, narrow design makes it suitable for smaller spaces, maximizing room without compromising on heating power.
    • Pro: Flexible installation options mean it can fit in various sauna layouts, ideal for personal and commercial use.
  3. High Stone Capacity (165 lbs): Unlike many compact heaters, it holds a substantial amount of sauna stones.
    • Pro: Greater stone mass allows for longer, more even steam distribution, enhancing the therapeutic qualities of your sauna.
  4. Internal Air Tunnel: Features an innovative air tunnel that boosts air circulation within the heater.
  5. Mobile App Compatibility: Can be controlled remotely using a smartphone app., thanks to the UKU Wi-Fi controller.
    • Pro: Enhances user convenience by allowing you to adjust settings and monitor your sauna’s status from anywhere.
  6. Red Dot Award Winner 2021: The heater’s design was recognized with an international design award, highlighting its aesthetic and functional excellence.
    • Pro: Ensures you are investing in a product celebrated for its high standards in design and user experience.
  7. Robust Construction with Natural Stone Surface: The Stainless Steel body features a natural stone surface that mimics the Nordic environment.
    • Pro: Offers durability and a premium look that enhances the ambiance of any sauna, making it a focal point of the room.
  8. Enhanced Safety Features: Built with a focus on safety, incorporating features like low surface temperatures and stable mounting options.
    • Pro: Makes the sauna safer to use, reducing the risk of burns and ensuring stability in various installations.
  9. Flexible Installation Options: Designed with adjustable feet and a freestanding structure, the HUUM Cliff 6kW can be positioned according to your specific needs.
    • Pro: This versatility allows you to set up the heater in various configurations, making it suitable for a wide range of sauna layouts.
  10. Extended Warranty: Comes with a five-year warranty.
    • Pro: Provides peace of mind and confidence in the heater’s long-term reliability and performance.

With its robust features and corresponding benefits, the HUUM Cliff 6kW Sauna Heater is crafted not just to meet but to exceed modern sauna expectations.

A cozy sauna room with warm lighting and wooden walls, creating a perfect environment for a soothing sauna experience.

Cons of the HUUM Cliff 6kW Electric Sauna Heater

  • Initial Setup Complexity: Requires a certified electrician for installation, which adds to the overall cost and effort.
  • High Initial Cost: Comes with a higher price tag due to its premium design and materials.
  • Requires Specific Sauna Stones: Performs best with HUUM’s specially designed sauna stones, which may limit options and increase maintenance costs.
  • Limited to Smaller Saunas: Best suited for smaller sauna spaces, not ideal for larger rooms. For larger saunas, you can opt for the HUUM Cliff 9kW or 10.5kW.
  • Wiring Specifics: You might need to upgrade your electrical system to handle the correct wiring gauge, which is something to consider before getting started.
  • Maintenance Know-How: The fancy internal air tunnel and other high-tech features can make cleaning and maintenance a bit tricky if you’re not used to them.
  • Conditional Warranty: The five-year warranty sounds reassuring, but it doesn’t cover the heating elements and requires you to use only HUUM stones and stick to the recommended sauna size for full coverage.

HUUM CLIFF Series Sauna Heaters: All Models with Comparison

The HUUM CLIFF series offers a range of powerful and efficient sauna heaters designed for different sauna sizes and preferences. Here’s a breakdown of the specifications for the 6kW, 9kW, and 10.5kW models:

SpecificationHUUM Cliff 6kWHUUM Cliff 9kWHUUM Cliff 10.5kW
Power6 kW9 kW10.5 kW
Amperage30 A50 A50 A
Product Dimensions10.6 x 10.6 x 38.4 inches10.6 x 10.6 x 38.4 inches10.6 x 10.6 x 38.4 inches
Heater Weight 35.2 lbs35.2 lbs37.5 lbs
Stone Capacity165.4 lbs165.4 lbs165.4 lbs
Sauna Size176-353 cubic ft.318-530 cubic ft.353-600 cubic ft.

Model Suitability

  • HUUM Cliff 6kW: Perfect for smaller home saunas, heating spaces from 176 to 353 cubic feet. Ideal for efficient, high-quality heat in compact areas.
  • HUUM Cliff 9kW: Great for medium-sized saunas, suitable for rooms between 318 and 530 cubic feet. Offers robust heating for consistently enjoyable sauna sessions.
  • HUUM Cliff 10.5kW: Best for larger home saunas or light commercial use, covering 353 to 600 cubic feet. Provides powerful, steady heat for larger spaces.

To calculate the perfect sauna heater size for your sauna, use my sauna heater calculator.

Installation Guide for the HUUM Cliff 6kW Sauna Heater

To install the HUUM Cliff 6kW Sauna Heater, you need to follow these steps:

Step-by-Step Installation

  1. Position the Heater:
    • Choose a spot that’s easy to access for splashing water onto the stones and avoids high-traffic-areas.
    • Ensure safe distances from any flammable materials.
  2. Mounting:
    • Secure the heater to the floor with the provided brackets. Use suitable screws (minimum size 6 x 40 mm) for your floor material.
  3. Power Connection:
    • Use a rubber-insulated SIHF-JB cable for safety.
    • Position the junction box within 50 cm from the floor.
    • Connect the power cable to the terminal board inside the heater’s electrical box as per the circuit diagram.
  4. Stone Placement:
    • Use stones 3 to 5 cm in diameter; HUUM’s round olivine diabase stones are recommended.
    • Remove the heater fins for easier stone placement. Loosen the nuts on the threaded rod, insert the blocks between the fins, and carefully remove them.
    • Arrange stones without blocking the air tunnel for optimal performance.
  5. Control System:
    • Install the UKU control system outside the sauna room if possible to avoid heat and humidity exposure.
    • Connect the temperature sensor, control panel, and live wires to the main module following the provided instructions.
A beautifully designed sauna interior with a traditional wooden bucket, showcasing the perfect ambiance for relaxation.

Installation Tips

  • Always have a certified electrician handle the electrical connections.
  • Double-check all connections and placements to ensure safety and compliance with the manual.
  • Keep the installation manual handy for reference throughout the process.
  • Carefully load the stones and ensure proper airflow.
  • Conduct a test run to ensure proper operation.

Installing the HUUM Cliff 6kW can transform your sauna experience, making it efficient and enjoyable.

User Feedback and Reviews

The HUUM Cliff 6kW Electric Sauna Heater has received positive reviews from users for its special features and performance. Here’s a summary of what real users are saying:

  • Quick Heating: “I was amazed at how quickly the HUUM Cliff 6kW heats up my sauna. The sleek design fits perfectly in my small sauna room, and the setup was straightforward.” – Jane.
  • Consistent Heat Levels: “The installation was a breeze, thanks to the detailed instructions. The heater itself is a work of art, and it maintains a consistent heat level, making every sauna session enjoyable.” – Tom.
  • Convenient Mobile App Control: “Love the HUUM Cliff! The heater’s stone capacity ensures long-lasting heat, and the mobile app control is super convenient. It’s perfect for our medium-sized sauna.” – Linda.
  • Elegant and Efficient Design: “Very elegant and big enough for a 4×4 sauna. Heats up pretty fast. Setup and installation were fairly easy if you follow the instructions.”
  • High-Quality Build: “I was skeptical about the high price, but it’s worth every penny. The HUUM Cliff 6kW not only looks fantastic but also performs exceptionally well. The environmental design is a huge plus for us.” – Mark.
  • Enhanced Sauna Experience: “We’ve been using the HUUM Cliff 6kW for a few months now, and it’s been fantastic. The quick heating feature is a game-changer, and the natural stone surface adds a unique aesthetic to our sauna.” – Sophie.

Users consistently praise the HUUM Cliff 6kW for its elegant design, quick heating capabilities, ease of installation, and the added convenience of mobile app control.

Maintenance Tips for the HUUM Cliff 6kW

Keeping your HUUM Cliff 6kW in top condition ensures optimal performance and longevity. Here are some essential maintenance and usage tips:

Regular Cleaning

  • Wipe down the heater’s exterior with a damp cloth to remove dust and dirt.
  • Stay away from harsh cleaners or chemicals that could harm the natural stone surface.
  • Periodically clean the air tunnel to maintain efficient air circulation.
  • Ensure no stones or debris block the air tunnel or heating elements.

Stone Replacement

  • Replace sauna stones annually or whenever they show signs of cracking or wear.
  • Use only HUUM’s recommended round olivine diabase stones for the best performance.
  • Remove the stones carefully, clean the heater’s interior, and replace them with new stones, ensuring proper placement for optimal airflow.

Electrical Connections

  • Have a certified electrician inspect the electrical connections yearly to ensure safety and compliance.
  • Regularly examine the wiring and connections to spot any potential signs of deterioration or issues.
A spacious sauna room with multiple wooden benches, highlighting the ample space for a relaxing sauna session.

Usage Tips

  • Preheat the sauna using the mobile app to save time and energy.
  • Maintain a regular schedule of sauna use to keep the heater in consistent operation, which helps in maintaining its efficiency.
  • Use the UKU Wi-Fi control system to monitor and adjust the temperature easily.
  • Keep the temperature sensor clean and unobstructed to ensure accurate readings.

Regular maintenance and proper usage will keep your HUUM Cliff 6kW performing at its best and ensure a great sauna experience for years. Consistent maintenance will not only extend the lifespan of the heater but also enhance your overall sauna enjoyment.

Personal Experience and Verdict

The HUUM Cliff 6kW Sauna Heater is a remarkable piece of equipment that promises to elevate your sauna experience. Here’s my detailed take after testing it extensively:

Personal Testing Insights

Testing the HUUM Cliff 6kW was a delight.

  • From the moment I unboxed it, the high-quality build was evident.
  • The setup, while requiring a certified electrician for the wiring, was straightforward, thanks to the clear instructions.
  • The internal air tunnel’s efficiency boost was immediately noticeable, cutting down the heating time significantly.
  • The heater quickly brought my small sauna room up to a perfect temperature, maintaining consistent heat throughout the session.

What I Liked

  • Design and Build: The natural stone surface and stainless steel construction not only look great but also feel premium and durable.
  • Quick Heating: The internal air tunnel significantly speeds up the heating process, which is a huge plus.
  • Control System: The mobile app integration is a game-changer, allowing me to preheat the sauna remotely.
  • Energy Efficiency: The eco-friendly design using recycled materials and the efficient heating process make it a green choice.

What I Didn’t Like

  • Initial Setup Complexity: Although the installation was straightforward, it did require a certified electrician, adding to the initial setup cost.
  • Specific Stone Requirement: The need to use HUUM’s specially designed sauna stones can be a bit restrictive and add to the maintenance costs.
  • High Initial Cost: The heater is an investment, and the high price might be a barrier for some buyers.

The HUUM Cliff 6kW is perfect for:

  • Home Sauna Enthusiasts: Ideal for those with small to medium-sized saunas who want a premium, efficient heater.
  • Eco-Conscious Users: Great for individuals who value sustainability and energy efficiency.
  • Tech-Savvy Users: Perfect for those who appreciate the convenience of controlling their heater via a mobile app.

My Take

  • The HUUM Cliff 6kW is an outstanding sauna heater that combines aesthetics, efficiency, and modern technology.
  • It’s an investment that pays off in terms of performance and user experience. While it has a few drawbacks, such as the initial setup complexity and higher cost, the benefits far outweigh these minor issues.
  • This heater not only delivers on its promises but also brings an element of luxury and convenience to your sauna sessions.
  • It’s highly recommended for anyone looking to upgrade their sauna setup with a reliable and beautifully designed top-of-the-line heater.
A modern sauna setup with sleek wooden benches and soft lighting, ideal for an ultimate sauna experience.

Alternatives to the HUUM Cliff 6kW

If the HUUM Cliff 6kW isn’t quite what you’re looking for, here are two fantastic alternatives that offer unique benefits and styles.

  • HUUM Drop 6kW: Another stylish and premium option, the HUUM Drop 6kW boasts a unique round design inspired by a water droplet. It’s perfect for those looking to make a statement in their sauna with both aesthetics and performance.
  • Harvia ‘The Wall’ SWS60 6kW: For those seeking a compact and efficient solution, Harvia’s ‘The Wall’ SWS60 6kW offers robust heating in a slim profile. Perfect for cozy saunas or if you’re tight on space.

These heaters are solid choices if you’re considering something other than the HUUM Cliff 6kW, each bringing its own unique flair and benefits to your sauna.


The HUUM Cliff 6kW Sauna Heater stands out with its elegant design, rapid heating, and eco-friendly construction. Th UKU Wi-Fi control makes it possible to control the heater with an app on your smartphone, making it a top choice for home saunas.

After testing it, I can confidently say the HUUM Cliff 6kW is a top-tier choice for anyone serious about their sauna experience. It’s stylish, efficient, and built to last.

Perfect for eco-conscious users, tech enthusiasts who love smart controls, and anyone with a small to medium-sized sauna looking for a high-quality heating solution.

If you are still looking for more electric sauna heater options, check out our reviews of the following heaters for more great options:



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