Stainless Steel Coil Heat Exchanger for dutch tub,Wood fired hot tub heater coils

Stainless Steel Coil Heat Exchanger for dutch tub

Item: Stainless Steel Coil Heat Exchanger for dutch tub,Wood fired hot tub heater coils,DIY your own wooden fired hot tub project

Short Description: Heater coils for you to DIY a firehot tub project in your back garden.Wood Fired Thermosyphon Heater,hot tub heat exchanger,burning a fire with wood outdoor in coil,as the best important part designed especially for  dutch tub,Pool Heater ,and wood fired outdoor hot tub,burning a fire in the coil to heat cool water,used as heat exchanger,utilizing thermodynamic nature circulation cycle principle to heat the water in the tub,circulate the water through the coil(water comes in at the bottom of coil,heats up,and thus absorb heat energy from hot coil tube,and then flows out at the top back into the tub),thus also named Hot tube heater coil.Made from polished stainless steel food grade 304 with high heat exchanging effience and perfect heat transfer efficiency performance,stability material properties.Has excellent temperature resistance , can prevent Frost Crack evaporator in the low temperature ,will safely working at minus 270 Deg C to 400 Deg C.Maximum Working Pressure:4.5Mpa,can heat more than 200gallon water.Used for water tub for having a outdoor bath.The heater coil is usually used for DIY your own backcountry camping hot tub,dutch tub water heater,then have a bath,relax yourself!

Place of origin: China , Sell to worldwide.

Order or Inquiry on “Stainless Steel Coil Heat Exchanger for dutch tub,Wood fired hot tub heater coils
Models & Details for “SS Coil Heat-Exchanger for dutch tub,Wood fired hot tub heater coils”



Advantage of firehot tub heater coil :
1.The heater spiral coil is made of seamless stainless steel(304) tube,can stand high pressure.
2.Sanitary&Healthy.As the material is Food Grade stainless steel 304;
3.Long service life.As the heater coil is made from quality stainless steel tube,it is anti-corrision,and thus,it is the best choice for the ourdoor enviroment;
4.Not heavy,it is easy to transport and is good choice for camping experience;
5.For manufactuing,we can process it into any shape and size by your design.Customized dimension is accepted.
6.Nice looking,the surface is polished and reached food grade standards.
7.Smooth inner surface and the water can circulate in the coil,small pressure-drop;
8.Has excellent temperature resistance , can prevent Frost Crack evaporator in the low temperature ,will safely working at minus 270 Deg C to 400 Deg C.
9.With stainless steel flanges to attach onto the hot tub;
10.With all accessories for you to build a complete hot tub.
11.Give you a good outdoor bathing experience,enjoy your spare time.

Feature :
[1]Stainless steel have strong material strength ,the tensile strength is better than other materials ,
[2]Stainless steel heat exchanger have many advantages ,such as strong pressure ,stability material properties ,high heat transfer efficiency ,wouldn’t contaminate medium and without refrigerant leakage .
[3]Stainless steel has excellent temperature resistance , can prevent Frost Crack evaporator in the low temperature ,will safely working at minus 270 Deg C to 400 Deg C.
[4]Stainless steel has good mechanical properties and good hot work ability for stamping and bending ,no heating treatment hardening.
[5]Can attach to Fiberglass Soaking Hot Tub,portable waterproof cloth tub,old traditional tin tub,wood tub,and other bath tub.
[6]principle:The basic coil was housed in a heater where firing, fire inside of coil produce heat,and exchanges heat to the water recycling inside the tube;Can use it in a straight sided bath tub;

Application :
Used as hot tub heat exchanger.If you want to build a backcountry camping hot tub,this Stainless steel spiral coil is is the best choice.This coil heat exchanger is widely used for you to DIY build an outdoor hot tub for having a nice bath outdoor and used as Wood Burning Pool Heater.It is the best part for you to DIY your own wood fired hot tub.

Tube size:Tube diamater 25mm * 1.5mm wall thickness
Size of coil part: Dia.340 * 300 height (mm)
Horizontal tail pipes: 460mm (Tail pipe length can be customized)
Tube end:Threaded
Circles:8 circles
Notice:The picture just for reference
Package:1 pcs / carton

Buying  Option 1:  Coil only

Stainless-Steel-Coil-Heat-Exchanger-For-Dutch-Tubss-coil-heat-exchanger  stainless steel polished-pipehot tub tread with cover protector

Buying Option 2: Coil + flange

option-2-coil-and-flangecoil flangeCoil Heat Exchanger For wood fired tub with flange

Buying Option 3: Coil Kit,Comes with accessories
 If you choose option 2 for buying “Stainless Steel Coil Heat Exchanger for dutch tub” from Smartclima,you can get accessories as following:
heater-coil-kit-accessories-1 dutch-tub-coil-kit-parts
 The kit includes:
  • SS coil,used for heat the water in tub;
  • Stainless steel flange,to install the coil onto the tub;
  • Smoke Guard,prevent smoke blow to the person in tub;
  • Wind Guard,prevent fire heat blow to the air.This guard is helpful to keep heat and improve coil working effience;
  • Wood Basket/holder,to hold burning wood under the coil,hold fire;
  • Water flowing stopper.When the heater coil is working,maybe you will feel the water in the tub is hotter and hotter,and then you want to prevent the water into the coil from heating.Then,you can use this accessory-water flowing stopper,very easy to use and stop the water flow into the coil immediately.A very useful item.
Additional option: Support for heater coil
A customized item used as support/bracket for heater coil stand onto the ground.Made from stainless steel,high 100mm,150mm,200mm,250mm,300mm,350mm,… … up to 650mm,upon to your choice,usually,3pcs used for a coil standing.If you want these brackets,note it in the order.
How to order “Stainless Steel Coil Heat Exchanger for dutch tub,Wood fired hot tub heater coils ”
  • The firehot tub coil is available for retail and wholesale;
  • The item takes large packing dimension,therefore,takes much volume weight.The place of origin is in China,when you buy one or two,please consider freight(by air or by sea) into the cost;
  • Accept bulk order with Container delivery;
  • Pls indicate us the quantity you need,so that we can calculate the shipping charges;After you confirm the price,we`ll send the invoice via Paypal for you to pay.We also accept payment method of Western Union or Bank wire;
  • Please contact us to email: heating@smartclima.com
  • To today,we already sold out more than 1100pcs Stainless Steel Coil Heat Exchanger for dutch tub,and get 100% positive feedback!  🙂 
General Knowledge on “Stainless Steel Coil Heat Exchanger for dutch tub,Wood fired hot tub heater coils ”

principle Wood-Fired-Hot-Tub-workingThe Firehot Coil Heat Exchanger works depending on the principle of natural hot circulation.  Natural hot circulation refers to: in a closed system,depending on density difference between hot and cold water,to form circulating liquid to drive an energy transmission. In the dutch tub coils,the cold water flows in from the bottom tail pipe,and goes up in form of spiral state,during this process,absorbing fire heat to let the water inside gradually become hot,and finally flows into the tub.During this cycle,the water in the tub becomes more and more hot…

The wood fired Hot Tub,used as hot tub heat exchanger, was just to utilize the Coil Heat Exchanger works depending on the principe of natural circulation to warm water to have a bath.

Without electricity or gas, you can enjoy bathing in a Wood-Fired Hot Tub in free and relax yourself at most.

This simplicity still appeals to many people. But also the rituals around it, like gathering the wood, burning the wood, regulating the stove and the heat, mixing the water up front. And then enjoy the rising steam and noises from the heater…….

In that respect a Wood fired Hot Tub is a total different product compared with the Jacuzzi from today which is working on electricity.

What is a Wood fired Hot Tub? A Hot Tub generally consists of the following components:

A heater / stove (made of stainless steel) being a sort of metal container below the water in which you can burn the wood. This heater has 2 openings that are above the water, 1 for air and landing with a wooden lid with wooden handle, and 1 for smoke exhaust. All our stoves are made of 2-3 mm stainless steel.

A chimney connected to the air pipe of the stove. This is a long metal pipe with a cap that serves as a spark arrestor.

A protective panel around the stove protecting you from burning on a hot stove.

Benches all around, so you can sit and relax. On request benches are removable for cleaning purposes.

Drink holders depending on the model attached to the cap of the stove, sometimes attached to the exterior. You can keep your drink or snack at a place holder.

A ladder, to be able to take place in the wooden bathtub.

A lockable wooden lid, Wood-Fired Hot Tub at the end when you can not use it. This prevents such leaves may fall, or insects get in the water.dutchtub-works

A stop so you can dirty water drains and evt. aanluitmogelijkheid one can achieve in the stormwater or sewer for dirty water.

Stainless steel around the Wood-Fired Hot Tub. This stainless steel straps are the rings around the Tobbe Tobbe which you can sue. Suppose that Tobbe has shrunk slightly in dry weather, you can tighten the straps slightly. On the stove side you can usually tighten the straps.

49 Comments  to  Stainless Steel Coil Heat Exchanger for dutch tub,Wood fired hot tub heater coils

  1. Ciaran Cunningham says:


    I have a 2.5m3 wooden hot tub, that i want to heat with a 22kw woodburner with backboiler, I would like to pump thru 22mm pipe to your coil immersed in the water, the water is 1000mm deep. what size of coil would you recommend and the price of the coil delivered to northern ireland

  2. Irene says:

    Hello! Im interested in purchasing a coil for a stock tank diy hot tub set up. Are you still selling these?
    Do you have any suggestions for which set up to purchase? It looks like flanges and a bottom tray for the fire might be good to have.


    • admin-smartclima says:

      Dear Irene. We have 3 options for you to choose. Option 1 coil only, option 2 coil and flange,and option 3 coil kit .When you choose option 3,please indicate us which height of support leg you need. For more details,our people will contact you by email. Thank you.

    • steve says:

      Irene, did you build this and if so how did it work? i am looking at doing this as well. Thank you

  3. Mr Lasse says:


    I have pool with 2000 liter.
    What coil do you have for that one?
    And what length and diameter options do you have on the coil? Do you have 32mm? What material do you use? What is the weight?
    Please let me know of cost for coil and shipment cost and lead-time to Stockholm, Sweden?

    I also wonder how much is a ready to use “dutch”tub for 4 person and shipping to Stockholm, Sweden.
    Many thanks!

    • admin-smartclima says:

      Ok,will communicate by your private email.We are happy to help you to built hot tub system with our coil heater.

  4. Peter Smith says:


    I would like to know the price and delivery costs in sending a heater coil for options 1,2 and three to Poland.

    Kind regards,

  5. William Killingbeck says:

    I bought coil kit from Smartclima here.It`s my DIY coil heating hot tub project. Works great!

  6. Alina says:

    Hello! I’d like to know how much option 2 of the Heat exchanger would cost with shipping to Germany.

  7. Bartosz Gudowski says:


    I have pool with 2000 liter.
    What coil do you have for that one?
    And what length and diameter options do you have on the coil? Do you have 32mm? What material do you use? What is the weight?
    Please let me know of cost for coil and shipment cost and lead-time to Stockholm, Sweden?

    Many thanks!

    • admin-smartclima says:

      yes,we have 32mm tube coil. For heating much water in hot ,we suggest to use 12circles with 32mm SS tube.

      Thank you.

  8. Badger says:

    Thanks, my coil came pretty quickly. I’ll send pictures when it’s installed on my tub…

  9. James says:

    How much is the SS heater coil shipped to Alberta, Canada? Thanks

  10. Szymon says:


    I’m interested in purchasing heating coil for my hot tub. What is the price range (including shipping) to Poland? What king of information do I need to supply to build a coil for me?


  11. Craig Hardman says:

    I’m after a quote for 1 coil for heat exchanger to be made and shipped to Australia. I’m located in Victoria and would require door to door postage as part of the quote.the application is water heated from engine exhaust at maximum 2000psi for carpet cleaning machine. pump rated at 15 litres per minute.
    dimensions are slightly flexible, 4 layer coil, height between 320 & 350mm, 3/8 stainless tube with 100mm legs at same end to future fit compression fittings.
    approximate centre tube diameter of each coil. 49.5mm, 78.5mm, 107mm, 135.5mm. this should be approx. 30-35metres.
    The housing will be 1555 diam x 430mm long.

  12. Simon Bradley says:

    Hi, could you please send me pricing on the coil heat exchanger for a Dutchtub and also with all the accessories.
    Kind Regards
    Simon Bradley

  13. Will Thomson says:

    Due to the current state of things over here all my fun little projects have been put on hold now.
    Sorry about messy you around like this, it actually came out pretty cheap to make the entire hot tub using your coil and good quality hard wood, which is annoying.

  14. Stokely Morgan says:

    Hello,I`m DIY building my outdoor hot tub in the back garden.Your coil seems very helpful.But I still need you to help me customize a heater coil which suit to my tub.Contact me,please

  15. M.Molavi says:

    I couldn’t express how much I like this coil. The tube is polished,looks very nice,and I feel the water inside can flow smoothly and “happily”. Ago,I had some troubles because of direct flames which burn my clothes when mixing up my potions. But now,with the indirect flame and wind and smoke shield, I can wear cloth leisurely,no worry other thing.

  16. Rob says:

    Hi, what is the price (+ shipping to new zealand) for option 2 with the additional support for the heater coil.

  17. Steve Roehrs says:

    About 10days ago,I got two coils from Smartclima.Arrived very well,no any broken.The coil is polished,looks very nice.I am DIY building my own wood fired hot tub in back garden.The coil heats up the water in tub very hot and very quickly. I`m pleased with this purchasing experience.Thank you very much.

  18. Neil Subin says:

    Can you tell me the price delivered to Florida, USA?

  19. Jenny Chapman says:

    Please advise quote price for
    Stainless steel Coil Heat exchanger for wood fired hot tub

    Also include delivery quote to Melbourne Australia

    Many thanks

    Jenny Chapman

  20. erik says:


    What is the price for a steel heater coild,
    deleverd to Belgium

    grtz erik

  21. Robert Fairchild says:

    I an interested in the stainless steel heater coild cost and the cost of shipping to Texas, USA.

  22. Mary Ann says:

    Last week,the coil kit was delivered to my house.Have set it up and it is working well.
    There seems to be a slow leak out at the bottom,I know it was caused by my clumsy installation.But no problem,I already fix that and seal it with silicon. Overall,it is a good item.
    I have friends asking me where I got it from,and I already introduced your website, so you might get more orders. ?

  23. Ivan says:

    I ordered one of these heat exchange units delivered to Seattle, US for a custom tub I am building. The price was competitive and delivery was timely. Thank you!

    • admin-smartclima says:

      Glad to know you enjoyed a good purchasing experience.thanks for your comment.if you can share the customed hot tub here,will be very thankful.

  24. Nabil Al bkari says:

    Hello,arrived the heater coil yesterday,same as described on the web.A little pity that there is a small scraping on the tube,I think it is caused during transport,but no problem for the using.Good product and great service,I`m satisfied with the purchasing experience.Thank you.

  25. Peter Powell says:

    The exchanger arrived a few weeks ago.
    Just wanted to say many thanks to you – it looks very good.
    I will send a picture of it when I build the hot tub.

  26. John says:

    Rather than purchasing a pre-made firehot bathing tub, I want to DIY my own bath tub with your heating coil and solid wood.I think it is simple and cheap cost.Could you help me?

  27. Dennis says:

    hello,I`m building my hot tub.The project need coil of stainless steel tubing inside fire wood to heat the flowing water.I need it to include wood basket and SS grade 304 flange fittings which are cast into the tub. I looked into the dutch tub coil and also viewed your website,I found the two are very similiar.Could you quote us the price for above to UK?Thank you very much.

  28. pearce jones says:

    Want to enjoy a hot bathing in cold winter evening and so Interested in purchase the coil kit to Construct a low cost hot tub with wood fire. Please advise price.

  29. Peter Baker says:

    Hi,I gout yout stainless steel heat exchangers coil samples.I`m pleased with them . Could your company make similar ones to a different size, to order ?
    I have joined the two I purchased from you and using them in an indirect heating system I have built to heat a swimming pool using a wood burner. I am thinking of perhaps marketing my prototype wood burner boiler and would need a purpose built larger heat exchange coil, with more turns and possible with a wider diameter. Has your company got the facility to make such variations to to the product I have purchsed from you?

  30. eric says:

    I would like to purchase one of these for a hot tub

  31. Mike says:

    Can you tell me the price of these coils as well as the shopping cost to Canada?

  32. Tomas says:

    Hello, please send me total cost for Stainless steel coil heat exchanger with delivery to Czech Republic? Thank you.

  33. Mick says:

    Hi, how much is the stainless steel heater coil delivered to the UK ?

  34. T. Hartley says:

    Hi, im interested in purchasing a stainlessteel heat exchanger.

  35. Johnson says:

    I live in the Germany and I want to build a wood fired hot tub.Already have wooden tub,and I want to purchase stainless steel coil heat exchanger from your company.Can you sell the coil with two 1″ flangers?Because I already installed corresponding flanges onto my tub tank.If that is ok,I want to buy more.Thank you.

  36. Phil says:

    I’m interested in buying one of these heater coils please tell me the total cost including shipping to Australia.



  37. Julian Llanas says:

    I an interested in the stainless steel heater coild cost and the cost of shipping to Texas, USA.

    Thank you,


  38. David Prisk says:

    How much is the stainless steel heater coild delivered to Auckland New Zealand


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