Kastor Karhu T Wood- Burning Sauna Stove (Through-the-Wall)

The atmospheric Kastor Karhu T, “Bear”, tunnel wood- burning sauna heater - also known as a fireplace-style sauna heater- seamlessly combines the ambience of a traditional wood-burning sauna with the inviting glow of a fireplace. Ingeniously designed, the heater unit is positioned within the sauna, while the fireplace door opens into an adjacent room - whether that's a dressing room, relaxation lounge, or a living area. 

This refined configuration allows you to enjoy the invigorating "löyly" (sauna steam) before transitioning to the warmth and atmosphere of the fireplace. Beyond creating a multi-sensory experience, the Kastor Karhu T also provides efficient secondary heating for the adjoining space, while keeping your sauna floor pristine by ensuring any wood debris remains outside the sauna. 

Meticulously crafted with clean, elegant lines, the Kastor Karhu T complements both modern and traditional sauna interiors. Its expertly engineered firebox and optimised stone compartment deliver lightweight handling without compromising on superior heat performance and longevity. 

Each Kastor Karhu T heater is CE-marked for safety, equipped with adjustable legs for effortless installation and features a 115mm internal flue diameter. Available in models designed for sauna volumes ranging from 12m³ to 30 m³, it offers tailored heating solutions for various sauna sizes. 

Please note: The front frame is sold separately. 

*Suitable amount of sauna stones, flue kit, front frame and heat shielding to be purchased separately.

Browse our sauna flue kits and chimney parts.

Please find the dimensions, recommended stone capacity and technical details in the downloadable files tab, p.32 in the Karhu Home Installation Manual. 

 Please see the Technical Specification tab above for detailed dimensions. 

About our Supplier Helo

Helo has brought health and wellbeing to people all over the world for over 100 years. Founded in 1919, it was the first manufacturer of electric sauna heaters. With innovative technology, smart functionality and stylish design, Helo sauna products upgrade the everyday sauna experience.

Helo electric sauna heaters are made of high-quality materials and handcrafted in Hanko, Finland. True to their Finnish origin, the company is creating opportunities for everyone to experience the Nordic sauna no matter where you are in the world.

Helo is a part of the global Sauna360 group, creating top quality sauna products to be a part of everyday healthy living. The incorporated brands of Sauna360 represent traditional Nordic sauna, steam and infrared wellness experiences for a modern lifestyle.

If you want to browse our wider selection of the Helo Sauna Heaters, click on the following link: Helo Wood Burning Sauna Stoves Collection

Click on the technical specification tab to learn more about the Kastor Karhu models.

Christmas and New Year's Shipping Update (Updated 2nd December 2025)

Please note the following changes to our pallet shipping and DPD delivery service on parcel orders over the Christmas period.

Our warehouse is fully closed for operation over the following days: Wednesday 24 December, Thursday 25 December, Friday 26 December, Wednesday 31 December and Thursday 1 January.

Orders requiring a pallet

The last dispatch date for orders requiring a pallet is Friday 19th December 2025. Pallet orders dispatched on this day must be booked and signed for with one of our sales team in advance.

Please note:

• Pallets dispatched on 19th December will be delivered on either 22nd or 23rd December, depending on your postcode
• We strongly advise against booking deliveries to the Highlands or Channel Islands close to the 19th December, as these may be held at the hub over the festive period
• There may be limited availability for pallet shipping on this day and we cannot guarantee that available slots remain

We will commence our regular pallet shipping service on Monday 5th January 2026.

If you have any questions about your pallet order, please get in touch with our Sales team: +44 (0) 20 8050 2895 or email info@finnmarksauna.com

Small Parcel Orders

DPD will deliver as normal up to and including Tuesday 23rd December 2025. Our daily cut-off for next day delivery is 2pm, with orders placed by 3pm on Tuesday 23rd December being our final dispatch before Christmas. Whilst we use a DPD Next Day delivery service, this is not a guarantee - please order earlier to avoid disappointment.

Limited dispatch service: We will dispatch DPD orders on Monday 29th December and Tuesday 30th December only during the festive closure period.

We will commence our regular delivery service on Monday 5th January 2026.

*Estimated delivery times are applicable to the UK mainland only (excludes Highlands and Islands). Additional delays and charges will be required for Non-UK Mainland and Highlands and Islands deliveries.