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


32mm tubing water heater coil with welded fireguard, all made from 304 stainless steel - great for heating water without electricity. Made from highly-robust materials for long-term outdoor use.  

STAND AND ASHPAN ARE NOT INCLUDED IN THIS LISTING AND ARE FOR ILLUSTRATION PURPOSES ONLY. 

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 (including the fireguard) - approx. 365mm
  • 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)
  • comes with 2 x 2 metre of heat-resistant hose.

The fireguard:
  • made from 0.9mm stainless steel sheet, 250mm tall
  • fitted and welded around the coil
  • enhances the thermo-syphon effect of the coil, containing the heat of the fire and channeling airflow more effectively.
The hose:
  • two x 3 metre lengths of heavy duty, heat-resistant hose and clips for attaching to the coil.

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 also sell brass connectors, stands and ashpans.


We are a small, family-run business in Scotland's central belt. 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.