Kastor Saga T - Through-the-Wall Wood- Burning Sauna Stove

Kastor Saga T through-the-wall, or tunnel sauna heater, is artfully uniting the invigorating heat of a traditional wood-burning sauna stove with the charm of a fireplace. With the heater positioned inside the sauna and the glazed fireplace door opening into an adjacent room - whether a lounge, dressing room, or living area - it creates a seamless flow between sauna bathing and fireside relaxation. 

This design not only enhances the experience but also provides efficient secondary heating for the adjoining space, while maintaining the cleanliness of your sauna interior, as any wood debris remains outside. 

With its meticulously considered proportions, the Kastor Saga T is as much a design feature as it is a high-performance heater. The carefully engineered firebox and expansive stone capacity  with a praiseworthy 140-190kg capacity for sauna stones, ensure long-lasting heat retention, consistent "löyly" (steam rising from the heater), and an atmosphere of refined luxury. 

Kastor Saga T is CE-marked for safety, equipped with adjustable legs for easy installation, and built to deliver years of reliable performance. Designed for those who value both exceptional craftsmanship and immersive sauna culture, it transforms the ritual of sauna bathing into a complete sensory experience.

*Suitable amount of sauna stones, flue kit, front frame and heat shielding to be purchased separately. The front frame shown in the third image is for illustrative purposes only and is not supplied with this product. 

Specification

Kastor Saga T is available in two sizes: Saga 22 T and Saga 30 T, suitable for saunas between 12-30m3.

Inside diameter of the flue: 115mm.

*Please see the Technical Specification tab above for detailed dimensions and recommended sauna room sizes for each model option.

Extras

The following items are available to be purchased separately:  

• 140-190kg of 10-15 cm olivine diabase or vulcanite sauna stones
• Flue kit
• Front Frame for the tunnel section
• Protective base and additional heat shielding 

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.

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 Saga 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.