VAT and delivery are included in the price.
VAT and delivery are included in the price.
VAT and delivery are included in the price.
VAT and delivery are included in the price.
VAT and delivery are included in the price.
VAT and delivery are included in the price.
VAT and delivery are included in the price.
A reliable external wood-fired heater for self-build hot tub projects
The Octa Heater is a classic choice for DIY hot tub builds, valued for its durability, heating performance, and timeless design. It works well with fibreglass, acrylic, wooden, and barrel-style hot tub configurations.
Installed outside the tub to leave more room inside for comfortable bathing.
A practical solution for self-build wooden hot tubs, flat-pack projects, and custom outdoor bath setups.
Designed for long-term outdoor use and compatible with a wide range of wood-fired hot tub heater setups.
Built into Octa M and Octa L outdoor heaters
Designed for DIY wood-fired hot tub projects, the double-pass heat exchanger helps improve heating efficiency, reduce wood use, and deliver better overall performance.
Hot air travels a longer path inside the heater, helping warm the water more efficiently.
The doubled heat exchange area supports faster and more effective heating.
A more efficient burn means less wood consumption and cleaner performance.
A practical solution for self-build hot tubs, cedar hot tub kits, and off-grid wood-fired bath projects where heating speed and efficiency matter.
Our heaters are engineered with essential safety features. If you're working on a diy wood fired hot tub, safety matters. The external wood fired hot tub stove body stays cool to the touch, as the internal fire chamber is surrounded by a water jacket. The outer surface warms only to water temperature levels.
To support diy wood fired hot tub builders and homemade wood fired hot tub users, the heater chimney features a lower thermal guard to prevent burns. Always follow key fire safety guidelines: maintain a 2-metre distance from roofs or flammable items.
Get the most out of your wood-fired heater with proper fuel
Using the right firewood ensures your wood-fired hot tub heater performs efficiently, heats faster, and produces less smoke.
Oak, ash, birch, maple, and beech provide steady heat and clean burning.
Dense hardwoods burn hotter and longer, improving overall heating efficiency.
Well-seasoned wood with under 20% moisture ensures cleaner combustion and better results.
Gardenvity heaters are designed for safe, efficient, and reliable performance — making them a practical choice for self-build wood-fired hot tub projects
Built with essential safety features for secure and comfortable everyday use.
The double-pass heat exchanger helps heat water faster and more efficiently.
High-quality heater solutions certified to meet EU requirements.
Designed for simple upkeep and reliable long-term performance.
Get expert help choosing the right model, features, delivery option, or anything else on your mind.
