Here in the UK it's been a great summer and I thought it would be good to relax at the end of the day in a nice hot tub. Trouble is they are quite expensive to buy and run and you need power and chemicals and really how many times would you use one. So I decided to build a low cost hot tub which can be run off grid and can be used quick and cheaply to have some fun.
Knodd 40L bin with lid from your favourite Swedish bin emporium. £15 25 m 10mm micro bore central heating pipe from any plumbers merchants. £ 40 Kids paddling pool - I got a 1.9 m pool from Argos at the end of the season for £30 Aquarium 8mm tubing for pumping the water round your coil. 12v pond or bilge pump to circulate water. 12v power source - a car battery is ideal .