In this instructable I will describe how I built a hot tub for less than $100 NZ ($75ish USD) from an old bulk liquids tank, a gas bottle and some stainless tube and junk that I had laying around.
This tub is cheap and relatively easy to build and is also useful as a plunge pool in hot weather too. Oh and you can cook on the top of it too!
Step 1: Stuff you will need
Parts: - 3 metres of 25mm (1in) stainless tube - 1 old LPG gas bottle (the kind used for barbecue grills) - 1 bulk liquids storage tank (the 1000litre kind with a steel palletised cage) - enough old corrugated iron to cover the outside of the tank - scrap polystyrene packaging - 1 closed cell foam camping mattress - a roll of soft narrow gauge binding wire (or equivalent - you could use cable ties at a pinch) - scrap metal parts for the legs and decoration - a canoe paddle or something similar
Tools: - arc welder (and the safety gear to go with it) - angle grinder with metal cutting and grinding discs - pipe bender large enough to bend 1 inch stainless tube - tin snips - heat gun / paint stripper - box cutter - strong pliers with a sharp cutting edge - the trusty knockometer - various clamps - magnetic welding clamps are handy - hacksaw (omit if you're deft with the angle grinder) - handsaw/drawsaw or equivalent - narrow nail punch/set or a strong nail - cordless drill with a 2 - 3mm bit - a vivid or permanent marker pen
- a gas axe is an optional extra here if you have one and aren't afraid to use it