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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. 

Step 1: Materials

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 .
<p>Question, just looking at those pumps, did you use a fuse between the pump and the battery?</p>
<p>Wow! might try this modification on what we did. For my birthdays I like to go camping but I also love our Japanese bath so for a special birthday we did something like this but for heat we used an old Zoti water heater for use on propane camp stoves similar to this : </p><p><a href="http://www.hotcampshowers.com/inc/sdetail/484" rel="nofollow">http://www.hotcampshowers.com/inc/sdetail/484 </a> </p><p>by recycling the water through it and supplemented it with pots of water over the fire. Your way though you don't need to use a lot of propane so I like it better (although copper tubing is way pricey now). Either way though it was the best soak and we covered it with pool cover cut to fit and were able to use it again the next day (just wash first before you go in as with Japanese baths)</p>
<p>Genius!</p>
I mean i know that my money value is 2&bull; what yours is but it would make it easyer
Nice but, could you convert in ( ) american money value?
Try a homemade it reflector above the tub. line the underside of a garden parasol etc with reflective aluminized snack packets, Dorreetos are among the best. They are much more durable than space blankets. It DOESN'T need to be in contact. I promise you will be amazed. john
Great idea many thanks
Love photo of the coiling process and your little dog looking at the camera. Too cute :^ D
Thanks - she loves photo-bombing :-)
Great Idea, now for a 'mod'! If you were to cut out most of the bottom of the bin, leaving say a 1&quot; rim inside, you could put a stout mesh inside. Put the bin on a coupla bricks. Then as your fire fuel burnt to ash, the ash'd fall out the bottom making yr unit self cleaning!
great idea! Now a little 'mod' for you! If you cut the bottom out of the bin and put some stout mesh in there, you can stand yr bin on a coupla bricks and as the fire burns, the ash'll fall out the bottom...making it self cleaning!
this is a awesome. we were without electricity for 10 days year before last and my husband and I took ice cold showers. gonna make one of these for emergencies as well!
this is a awesome. we were without electricity for 10 days year before last and my husband and I took ice cold showers. gonna make one of these for emergencies as well!
In the UK we sometimes like the off grid Hillbilly lifestyle :-) - but the heating coil is the same design as a Hillbilly Moonshine still.
you have hillbillies in yhe UK?
Yeah!
&ldquo;Y&rsquo;All Come Back Now, Ya Hear?&rdquo;
Cool idea and I too love innis and gunn my personal favorite is the rum cask.
Thanks ! Nothing better than the rum cask - very smooth and just right for soaking your cares away :-)
You could use this on any pond or paddling pool, maybe even stoke a small fire to stop a fish-pond freezing in winter.
Yes - good idea for fish ponds - just need some wood and a battery to get going.
Great work! very helpful idea!
Thanks - it is a great fun project you can do very easily.
Been using it for a year now with no problems - just have a beer handy to cool everything down :-)
Seems like it could get a bit too hot and the rubber could come apart, but pretty dang fun looking man!

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