Off-grid DIY wood-fired stock tank hot tub

Sample part list:
1. Stock Tank (Check out your local farm supply store. These are in short supply in 2020)
2. Tank Fitting:
3. Hose Fitting (I use this to fill the coil):

Want to add a pool filter? Check our these items:
1. Summer Waves Return fitting 1.25 inch (Shop around to make sure you buy one with the plug and deflector)
2. Summer Escapes Replacement Suction Wall Fitting for 600 GPH Filter Pumps (make sure it is for the 1.25 hose)
3. Basic Intex Pump (Shop around, prices are inflated)

Video Description:
I turned a 6 foot diameter stock tank into a quick heating hot tub which circulates water using heat (and paddle) alone.I used 50-60 feet of one inch cooper coil, which makes this heat much faster than other examples I've seen.

Please note:
For entertainment purposes only. Heated liquids under pressure are dangerous, do not attempt!

[CollinCooper-yp]

I made one similar. I used a 55 gallon drum. The coils are a little tighter therefore closer to the fire.
The bigger improvement I would recommend is using a fishtank pump to aid the thermal syphon. That helps us heat up our hot tub almost 10° per hour.

[samuelkatherinediozarago]

Few Improvement:
1 Insulate the fire chamber.Close one like a drum barrel with ceramic blanket is better.
2 Bend the copper tubing in a sprial pyramid form and Use it in the MIDDLE of the fire not around it.
That way it will be much more effective

[travelersworldcafellc]

If there is room Lava rocks on the bottom of your fire pit to improve thermal mass... and a few bricks would help... also do you have any foam under your tank? The ground will steal a lot of heat via conduction... Bless and thanks. I have one with a barrel stove in mind

[StarPathAcademy]

look at the beautiful family, good for you! nice project, thinking about replicating it.

[TheNora_]

Love this!! I am in Tenerife so I will try this with garden hose in the sun only… solar power only

[straightdapointD]

Pretty simple and it looks efficient, 40 degrees is a lot for a tank of that size.

[ernestoespinoza]

I might do this. But I’ll insulate the outside with closed cell foam, put some sort of liner inside, bury it to make it about ground level and make a cover for it which should help with the heating. Also will run a pump and filter setup. Hopefully it comes out well. I’m thinking 🤔 if I should do it

[Trvlrxxx]

Really ought to have a pump and filter on that tank. The pump will circulate the water and help warm it up quicker. Not to mention keep the pool clean.

[rdannyb]

Really really nice build. Now if I could figure out how to do similar, but without a pump, with an unground pool.

[DivineZeal]

Great idea! I want to try this offgrid on my land

[brentkelly]

Gotta insulate the tub. Cover / sides/ maybe even bottom. probably would get to temp in a hr or less. Does it have to be a coil? Could it not just be a 2" pipe, U shaped sitting in fire sort of kicked horizontal. everyone uses a coil

[Mpayne]

Suggestion
Cover the tub
The water will heat quicker
👍

[kathybogantes]

Hello, I love the idea and we want to do it in our house.
But I have a question, how does water pass through fire?
Does it use a pump or is it gravity? Thaks

[matthewkleinmann]

I have a softtub brand hot tub. This brand uses the waste heat from the motor to heat the water. It is a clever idea, but it can take a long time in the winter to get the water hot enough for you to want to be in it, and the only time I like being in the hot tub is in the coldest of winter nights. I try and keep the water balanced from about October through about April. More often than not I will need a mid winter change. We have a 30 or 40 gallon hot water thank and the tub holds about 350 gallons. I have been pondering a copper loop in a fire for a long time now, and I think you have convinced me to do it. BRW how is that metal tank holding up with your choice of sanitizer?

[losttribe]

U can also do the same with a camp stove

[dcan]

do you have solder joints in the fire? or is the coil just 1 length?

[noahno]

Ive watched a few DiY videos on this now and it seems like most are getting up to temp around 3 hours, which honestly...is a little long for anyone who doesnt have a ton of time in the day to relax. Any simple ways to halve this- adding a second coil maybe?

[victorcooper]

I have ran one just that way but it can be dangerous can make steam safer if the coil Is in water

[simplemindsme]

I love it!! Question...the thermal heated water cycles on it's own and continues untill fire is out???? How did the first water go in the pipeline..

[tomohawkravenmoon]

how about a small 12 volt heat tolerant circulating pump, warm up time is quicker and you don't have to tip over or bail out the pool when you are done. i don't know about the availability of such a pump but it would be worth it.