Product Description
TimberIN Nordic External™ Wood-Fired Hot Tub Heater
The TimberIN Nordic External™ is a professional-grade external wood-fired hot tub heater, engineered for fast, reliable water heating and long-term outdoor use. By mounting the heater outside the tub, you preserve internal space while gaining easier access for loading, cleaning, and maintenance.
🔥 Choose the Right Power Output
This model is available in three power variants, each designed for a specific water volume:
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22 kW – ideal for hot tubs up to 1,000 litres
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28 kW – suitable for 1,000–1,500 litres
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40 kW – recommended for large hot tubs above 1,500 litres
Selecting the correct output ensures faster heating, better fuel efficiency, and stable water temperature.
⚙️ Engineered for Performance
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External stainless-steel heater body
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Optimised combustion chamber for efficient heat transfer
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Glass fire door for flame visibility and combustion control
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Integrated ash drawer for easy cleaning
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Standard Ø129 mm flue connection
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G1/2″ water connections for hot tub circulation
🪵 Why Choose an External Wood-Fired Heater?
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Keeps tub interior free from bulky heaters
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Safer and easier firewood loading
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Flexible positioning next to the tub
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Ideal for retrofits and new installations
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No electricity required
The TimberIN Nordic External™ is the ideal solution for customers seeking authentic wood-fired heating with modern efficiency and robust European construction.
TimberIN Nordic External™ – Model Comparison
| Specification | 22 kW | 28 kW | 40 kW |
|---|---|---|---|
| Model code | BFTS-50 | BFTS-75 | BFTS-100 |
| Power output | 22 kW | 28 kW | 40 kW |
| Recommended water volume | Up to 1,000 L | 1,000–1,500 L | 1,500 L+ |
| Heater type | External wood-fired | External wood-fired | External wood-fired |
| Installation | Outside hot tub | Outside hot tub | Outside hot tub |
| Combustion chamber length | 45 cm | 42 cm | 57 cm |
| Overall length | 62 cm | 87 cm | 102 cm |
| Width | 40 cm | 40 cm | 40 cm |
| Height | 67 cm | 67 cm | 67 cm |
| Flue diameter | Ø129 mm | Ø129 mm | Ø129 mm |
| Material | Stainless steel | Stainless steel | Stainless steel |
| Door | Glass fire door | Glass fire door | Glass fire door |
| Ash drawer | Yes | Yes | Yes |
| Connection | G1/2″ | G1/2″ | G1/2″ |
| Best for | Small tubs | Medium tubs | Large tubs / fast heating |
👉 See all our wood-fired hot tub heaters to compare models and outputs.
