Harvia HUUM Hive Heat 12kW LS Wood-Burning Sauna Stove with Firebox Extension - H1012012
The HUUM Hive Heat 12kW LS , featuring a convenient firebox extension, is engineered for an exceptional sauna experience, perfect for medium-sized saunas with its rapid and consistent heat distribution. The innovative firebox extension allows for easy wood loading from an adjacent room, ensuring an uninterrupted and serene sauna session. Renowned for superior craftsmanship, blends traditional techniques with modern design, and the Hive Heat 12kW LS reflects their commitment to quality and sustainability, crafted from premium stainless steel for durability. By incorporating this eco-friendly stove, you minimize your ecological impact while enjoying an authentic sauna experience, all within a stylish design that transforms your wellness space into a serene sanctuary.
What our Experts Think
-
Smart dual-room heating design – The 12kW LS model with firebox extension is built for loading wood from outside the sauna, improving safety, cleanliness, and user convenience.
-
Efficient 12kW output – Ideal for small to medium sauna rooms (approx. 6–13 m³) with fast, stable heat build-up and consistent performance.
-
Premium steam quality – Around 90 kg stone capacity delivers soft, long-lasting löyly, avoiding harsh or dry heat spikes.
-
Clean-burning airflow system – Engineered to direct fresh air into combustion for a stronger, more complete burn with reduced waste and emissions.
-
Firebox extension advantage – Experts highlight it as a major usability upgrade, allowing wood feeding from another room and keeping the sauna space smoke-free.
-
Durable build quality – Stainless steel construction with cast iron door ensures high heat resistance and long service life under repeated use.
-
Traditional sauna experience – Combines real wood fire atmosphere, crackling heat, and modern engineering precision for authentic sauna rituals.
Q&A
Q: What sauna size is this stove suitable for?
A: Designed for small to medium saunas, typically up to ~13 m³ (around 459 ft³).
Q: What type of fuel does it use?
A: It is a wood-burning sauna stove, delivering a traditional, authentic sauna experience.
Q: What is the firebox extension for?
A: It allows you to load wood from an adjacent room, improving safety, cleanliness, and convenience during use.
Q: What is the heating power?
A: It provides 12kW of heat output for efficient and steady sauna warming.
Q: How does it burn wood efficiently?
A: It uses a top-air combustion system that promotes cleaner burning and reduced emissions.
Q: What is the stone capacity?
A: Around 90 kg (≈198 lbs) for smooth, long-lasting steam (löyly).
Q: Is it durable?
A: Yes, built with stainless steel and a cast iron door designed for high heat resistance and long service life.
Q: Does it require professional installation?
A: Yes, proper chimney connection and safety clearances require professional installation.
Q: What kind of sauna experience does it deliver?
A: A soft yet powerful traditional wood-fired heat with excellent steam quality and steady warmth retention.
Maintenance Tips
-
Empty ash tray regularly to maintain strong airflow and efficient burning.
-
Clean firebox and extension chamber after frequent use to prevent soot buildup.
-
Inspect firebox extension joints to ensure secure connection and no heat leakage.
-
Check chimney/flue monthly and remove creosote for safe, smooth exhaust flow.
-
Replace sauna stones every 2–3 months if cracked or deteriorated.
-
Keep air intake vents clear for proper combustion and stable heat performance.
-
Use dry, seasoned firewood only to reduce residue and improve efficiency.
-
Inspect door seals, hinges, and welds periodically for durability and safety.
-
Annual professional servicing recommended for long-term safety and optimal performance.
Damage 
Loss 
Theft 
![Chery Industrial [BARGAIN] 20ft Farm Metal Driveway Gate with Diagonal Tubes - A_IF000054](http://backyardprovider.com/cdn/shop/files/farmgatewith_31.png?v=1775546952)
