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heat exchanger for non barrier tube

Ron Schroeder
Ron Schroeder Member Posts: 995
in THE MAIN WALL
Put the water that goes thru the non-barrier tubing on the part of the indirect that is made of copper, stainless steel or glass lined and put the boiler water on the side that is iron.

If both sides are "stainless" then I would put the boiler on which ever side holds the most water to help in reducing short cycling.

Comments

  • garimech
    garimech Member Posts: 5


    I'm planning on using an indirect hwt as the heat exchanger on an existing system with non barrier tube. In the past I've always used flat plates. My question is should the coil of the indirect be on the boiler side or the tube side? I've been hearing conflicting ideas. The heat source is a Lochinvar two stage boiler (high fire is 270). The system heats a pool, a hot tub and an eighty gallon indirect for domestic as well.
  • hr
    hr Member Posts: 6,106
    My favorite tank for that

    is the Triangle Tube or Weil Gold series. I feel that tank in tank design has the best heat transfer surface area and least effected by hard water build up. Priced about the same and I think they go as small as 30 gallon capacity.

    On glycoled system obviously you want the glycol in the small capacity side :)

    Other than that with two pumped flows the heat transfer should be the same regardless of A or B orientation. The outer tank is generally the boiler side and has 1-1/4" connections.

    Be sure to protect both sides with expansion and relief valves.

    hot rod

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  • garimech
    garimech Member Posts: 5


    Thanks hot rod. Now I can quit mulling this over and go enjoy my Sunday afternoon.
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