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Building an Oven with pipes to heat my hot tub?!?!

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  • Building an Oven with pipes to heat my hot tub?!?!

    Is this a new concept? I am building the dome style brick oven near my separate deck and hot tub. I want to run 1" copper pipe under the floor and into tub. Why waste the heat after your pizza is done.
    Any ideas?

  • #2
    People have done things like this not sure if it was on this forum or not. I think it's not worth the trouble to be honest esepecially for the amount of use you may use your oven. If you fired it weekly then maybe you would recoup some savings in using this than your electric heater but you would need safety measures pressure relief and obviously a pump thermostat and or a heat exchanger...doesn't seem worth it unless you were off the grid IMO.

    My Build Pictures


    • #3
      Hey Ricky:

      I agree to your points.

      To me it is a fun project. So I am ok with the cost and intermediate use of the system.

      I will just give it a try and report back.



      • #4
        I have never seen this done before, but I have seen wood burning hot tubs. I like the concept, but I don’t see this working out too well. Taking out the cost and time it takes, the concept doesn’t make sense to me. I don’t think it could heat up a hot tub, because most of the heat comes off the dome rather than the bottom. Maybe in addition to a preexisting hot tub heater, but I’m not sure. I’ve seen wood fired hot tubs but the pipe does not come out of the bottom. Goodluck


        • #5
          I was thinking something simular for the oven and grill to heat my pool, the build is taking toooooo long as it is without making it even more complicated, so I didn't bother.
          My 32" oven, grill & smoker build


          • #6
            The simple reality is that the water pipe (wet back as it's called in New Zealand) will "rob" too much heat from the fire to be able to make pizzas at the same time. So, it can work if you're only trying to heat the hot tub and, for the thermosyphon to work your hot tub will need to be higher than the oven, unless you're using a pump to move the water around. But yes, with a suitable wetback copper vessel and pipe setup you could heat the water. We had an old wood range which we used to heat water and it would boil 200l (about 54 gallons) after about 2 hours of fire. So, certainly possible.
            My 42" build:
            My oven drawings: My oven drawings - Forno Bravo Forum: The Wood-Fired Oven Community


            • #7
              Thanks for the help. I think I will give it a try and report back.