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Thread: Tankless replacement question

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  1. #1
    DIY Junior Member Lmd555's Avatar
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    Default Tankless replacement question

    As I discussed yesterday, I have a 65 gallon natural gas heater with a recirculating pump system that may have a leak. I'm considering a couple of replacement options, one of which is another tank.

    I'm also considering a tankless. There is a significant tax credit and rebate from the gas company for doing that.

    Aside from the general pros and cons of tankless, what do you do with the existing recirculating pump/system with a tankless? I suppose one option is to disconnect it.

    If I wanted to keep it, how would you design such a system? Would you have the tankless system on the line ahead of maybe a 5 gallon heater that would utilize the existing recirculating system?

    Would such a system work and provide the best of both worlds? Or maybe it would cost so much interms of installation and energy use so as to defeat the purpose of saving money with tankless? Also, perhaps such a setup would void any tax credits or rebates associated with a tankless.

  2. #2
    Plumber jimbo's Avatar
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    If you need a recirc system now...you would still need it. Tankless does not change that equation. Some tankless work with recir, others don't. You need to get installation instructions from your tankless manufacturer on how to install it with recirc

  3. #3
    DIY Junior Member Lmd555's Avatar
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    Quote Originally Posted by jimbo View Post
    If you need a recirc system now...you would still need it. Tankless does not change that equation. Some tankless work with recir, others don't. You need to get installation instructions from your tankless manufacturer on how to install it with recirc
    But how does tankless work with recirculating? Would it continuously heat water thar runs in a loop?

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    Moderator & Master Plumber hj's Avatar
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    It would until the temperature stabilizee, but the same thing happens with a tank type.
    Licensed residential and commercial plumber

  5. #5
    DIY Junior Member Lmd555's Avatar
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    Could you disable the recirculating system?

  6. #6

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    Quote Originally Posted by Lmd555 View Post
    Could you disable the recirculating system?
    Sure you can.

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