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Mega wider tube (32mm) x4 size heater coil with detachable tails

Mega wider tube (32mm) x4 size heater coil with detachable tails

For when you're working with a LOT of water...


Large scale and extremely robust hot tub heater coil, made from twenty four and a half metres of 1 and a quarter inch (32mm) 304 stainless steel tubing. 


This model is only available with 400mm detachable tails (tail length is measured from the outermost edge of the coil to the end of the tail). The tails are attached and detached via 1" BSP threaded ends and 1" brass sockets. This can be particularly helpful if you are looking to fit the coil into an existing metal drum/barrel. Due to the weight of this coil, the tails may be sent to you in a seperate parcel (and will definitely be sent seperately if you also order hose and/or brass connectors).


Ideal for using as part of a set-up to heat very large quantities of water using responsibly-sourced firewood - no electricity required. Please note that this does not mean it will turn a swimming pool into a hot tub - it will take the chill off the water, but it will not heat several thousand litres to a high temperature.


Inner diameter of approx 500mm, outer diameter of 550-570mm. Comes with 400mm tails as standard (tails measured from the outer edge of the coil). Height is approximately 550mm. Please note that if you need the coil to very exact specifications, please contact us first - we can make this coil narrower and taller (within reason) if requested.


You can add heat-resistant hose, brass bulkhead connectors and more to this coil. Check out the other items in our shop and just click 'add to cart'. 


Heat-resistant hose

Brass bulkhead connector options

Safety item - downcomer tube for warm water outlet tube


We can also weld British Standard Pipe threaded ends onto our heater coils. However, this requires your measurements for connecting your heater coil to your hot tub to be very precise. If you are interested in having threaded ends welded to the tails of your heater coil, please contact us via email or telephone first. 




    Ensure that the coil is placed a safe distance from your hot tub and is both stable and secure. Please take particular care of how and where you use your heater coil in any settings where children or animals may be present - safety should be paramount at all times. Any attachments/ connectors/high temperature hose you choose to use should be well clear of the flames.

    It is advisable to conduct a brief common sense safety check of the setup before firing the coil. The coil should be set away from any thoroughfare and flammable materials etc.  

    Please note that your cold water inlet and hot water outlet feeds must be below the water level in your hot tub at all times when your coil is in use. If the water line in your tub is below the level of your warm water outlet feed from your coil (or drops below it while you are using your tub) water will stop flowing through your coil and just sit in it, becoming extremely hot. This is called 'dry firing' the coil, which is extremely dangerous and will result in scalding hot water or steam coming out of the hot water outlet. 

    ​If you have a stocktank style hot tub, we would advise attaching it to your coil with the hot water outlet below the upper ripples in the tank. 

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