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Step 7Bend up the heating coil
Sorry I don't have any pictures of the next step - it all happened in a bit of an excited rush.
I used 3m of 25mm (1 inch) stainless steel tube for the heat exchange coil. This makes about 2 full turns and 2 half turns at approximately the inside diameter of the LPG bottle I used. You may want to increase the number of turns or vary the diameter of the coil depending on the gas bottle you use. The only word of warning I have is that the more coils you have the less well the fire will burn - the cold water in the coil reduces the efficiency of the fire.
I used an ancient manual screw type pipe bender which was a lot of work to use. You might want to take it to a muffler/exhaust shop and get them to bend it for you ( a local high school might let you use their workshop also)
You need to leave about 40 to 50 cm of straight tube at each end of the coil to give you enough distance to the tub (you don't want the flames and smoke to spoil your evening)
I used 3m of 25mm (1 inch) stainless steel tube for the heat exchange coil. This makes about 2 full turns and 2 half turns at approximately the inside diameter of the LPG bottle I used. You may want to increase the number of turns or vary the diameter of the coil depending on the gas bottle you use. The only word of warning I have is that the more coils you have the less well the fire will burn - the cold water in the coil reduces the efficiency of the fire.
I used an ancient manual screw type pipe bender which was a lot of work to use. You might want to take it to a muffler/exhaust shop and get them to bend it for you ( a local high school might let you use their workshop also)
You need to leave about 40 to 50 cm of straight tube at each end of the coil to give you enough distance to the tub (you don't want the flames and smoke to spoil your evening)
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