Instructables

HillBilly Hot Tub

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Picture of HillBilly Hot Tub
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. 
 
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Step 1: Materials

Picture of Materials
2013 20:35.jpg
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 .

Step 2: Construction

Picture of Construction
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2013 20:28.jpg
The beauty of this is that it is so easy to make. We only need to construct our heat exchanger inside the metal bin in order to get tubbing! If you go with the Knodd bin you will see that it is tapered. This allows us to use it as a nice former for our heat exchanger. Start by drilling a hole in the side of the bin and insert the end of the coil from outside to inside the bin. Then start turning the bin smoothing the coil tight against the outside of the bin. After a while you will have a lovely shiny heating coil.
waggy1017 months ago
I mean i know that my money value is 2• what yours is but it would make it easyer
waggy1017 months ago
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
stonky8 months ago
Great idea many thanks
bginlalaland10 months ago
Love photo of the coiling process and your little dog looking at the camera. Too cute :^ D
richiemcb (author)  bginlalaland10 months ago
Thanks - she loves photo-bombing :-)
Ole bally11 months ago
Great Idea, now for a 'mod'! If you were to cut out most of the bottom of the bin, leaving say a 1" 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!
Ole bally11 months ago
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!
richiemcb (author) 11 months ago
In the UK we sometimes like the off grid Hillbilly lifestyle :-) - but the heating coil is the same design as a Hillbilly Moonshine still.
Wifflechicken11 months ago
you have hillbillies in yhe UK?
snotty11 months ago
Yeah!
J-Five11 months ago
“Y’All Come Back Now, Ya Hear?”
rhathaway11 months ago
Cool idea and I too love innis and gunn my personal favorite is the rum cask.
richiemcb (author)  rhathaway11 months ago
Thanks ! Nothing better than the rum cask - very smooth and just right for soaking your cares away :-)
Kiteman11 months ago
You could use this on any pond or paddling pool, maybe even stoke a small fire to stop a fish-pond freezing in winter.
richiemcb (author)  Kiteman11 months ago
Yes - good idea for fish ponds - just need some wood and a battery to get going.
Kevanesoso11 months ago
Great work! very helpful idea!
richiemcb (author)  Kevanesoso11 months ago
Thanks - it is a great fun project you can do very easily.
richiemcb (author) 11 months ago
Been using it for a year now with no problems - just have a beer handy to cool everything down :-)
ilpug11 months ago
Seems like it could get a bit too hot and the rubber could come apart, but pretty dang fun looking man!