No electricity! No cables! Just lots of hot water for your wood-fired hot tub :-)


An extra large stainless steel heater coil made from extra wide 32mm (1 and 1/4 inch) tubing - great for heating your hot tub without any need for electrical plug points, extension cables etc made from extremely durable materials. Great for long-term outdoor use.  THE TUBING IN THIS COIL HAS A 50% GREATER INTERNAL VOLUME THAN OUR STANDARD COILS.

The heater coil:
  • 6 metres of 1 and 1/4 inch (32mm) stainless 304 steel tube (with a 1.5mm wall)
  • inner diameter - 300mm
  • outer diameter - approx. 360mm
  • approx. 270mm (6 coils) high - works well with both wood and charcoal
  • comes with 300mm tails (tail length is measured from the outermost edge of the coil to the end of the tail).
The heat-resistant hose:
  • 2 x one metre of 32mm, heavy duty, heat-resistant hose
  • can withstand up to 120 degrees centigrade
  • comes unattached to coil for ease of delivery - snug fit but a firm push will attach it to the tails. Stainless steel jubilee clips provided to secure the hose.

To use, first attach to your hot tub by using any suitable method. Then build a fire within the coil and allow the hot tub water to heat. Heating time will vary depending on water temperature, ambient temperature and hot tub size - be sure to have a means of checking your water temperature before use and of reducing/extinguishing your fire once that temperature is reached.


We are a small, family-run business in Ayrshire, Scotland. We also make custom heater coils for wood-fired hot tubs and other types of heat exchanger coil. Please contact us for any custom requests.