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Thread: discontinue use of tankless coil

  1. #1

    Default discontinue use of tankless coil

    I have an older weil-mclain boiler that has a tankless coil in the top of the boiler. I am going to discontinue using the tankless coil. Do I need to remove it or can I simply disconnect it and leave it in place?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    To provide DHW, this type of boiler tends to maintain internal boiler water temperature higher and more consistent than those that do not have this feature. There may be a separate aquastat and possibly a flow sensor. You'd want to fool the boiler to think that the DHW requirements were met so it wouldn't fire in the summer or other times unnecessarily. Also, some of these have a flow restrictor in them to help ensure adequate heat output. You may need to address that if you do what is described in the next paragraph.

    You may want to still run the output of this coil to your tank as the cold input if you can't disable the controls. Someone with more understanding of the controls may be able to help decide the best route.

    Are you going with an indirect, or a separately fired WH?
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

    Default

    We are going with a seperate unit. Thanks for the help

  4. #4
    In the Trades Bob NH's Avatar
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    I have a tankless coil and wanted to shut down the boiler in the summer because the fuel to keep it hot was so great.

    I connected the tankless coil to the input of an electric water heater. In the winter the oil-fired boiler heats water going to the water heater. In the summer the water heater takes over. The only management of the process is turning off the boiler when heating is not needed.

    I did install valves so the tankless can be isolated from the water heater and bypassed.

    If I were abandoning the tankless coil I would disconnect it, blow out the water with air, and plug both ends. That way, if it ever sprung a leak it would be contained.

  5. #5

    Default more opinions please

    anyone else have ideas on this?
    Quote Originally Posted by Handyman Extraordinaire View Post
    I have an older weil-mclain boiler that has a tankless coil in the top of the boiler. I am going to discontinue using the tankless coil. Do I need to remove it or can I simply disconnect it and leave it in place?

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