Kastor Karhu Home Wood Sauna Stove

The most compact yet powerful wood-burning sauna heater in Kastor’s selection, Karhu Home heats up your sauna efficiently (72%), requiring only a modest amount of firewood.

The stone capacity of 77–88 lbs is plenty for strong and sharp löyly (hot steam) but not excessive, which means Karhu Home heats quickly.

Several users mention how effortlessly Karhu Home heats even larger saunas (even at the upper limit of its capacity).

The internal design promotes proper air circulation and firebox ventilation. Some sauna bathers feel it allows them to sauna longer without feeling exhausted and drained afterward. Instead, they feel pleasantly relaxed.

Durable, well-built, and with a robust frame, Karhu Home will serve you for years to come.

Capacities & Dimensions

For sauna rooms from 283 to 706 cubic feet
Nominal heating capacity: 12 kW
Stone capacity: 77–88 lbs
Efficiency: 72%
Dimensions: 17 W × 19 D × 29 H in (435 × 475 × 730 mm)
Heater weight without stones: 99 lbs

🔶 Not sure about sizing? Use our sauna heater size calculator.

Clearances to Combustibles

Ceiling clearance: 51 in (1 300 mm)
Side clearance: 12 in (300 mm)
Front clearance: 20 in (500 mm)
Rear clearance: 12 in (300 mm)

🔶 If you want to reduce these minimum safety distances, metal sheets and cement boards are viable options.

Check out a real-world example: How to Reduce Clearances
📄 Installation manual: Kastor Karhu Home

Features

2-year warranty (in home use)
Made in Finland, CE-certified
Color: dark gray/silver
Material: steel
Floor model with adjustable feet in the front
Reversible glass door (left- or right-hinged)
Stone size: Ø 4–6 in (10–15 cm), required for operation & sold separately
Flue connection location: top/rear
Flue connection diameter: 4.5 in (115 mm) (see our chimney kits)

🔶 Need sauna stones? As they’re hard to find in the US & expensive to ship, we’ve partnered with North Shore Sauna that sells proper sauna stones mined in Minnesota & offers free shipping for orders over $100. When you buy through us, we get a commission and you get a discount code: if you buy six or more boxes, you get $50 off with the code SAUNAIS50.

Complete your setup: Buy real sauna stones