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  1. Replies
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    "Overheating" The Heat Exchanger

    That's a great point... but my understanding is that the boiler's controller is smart enough to stop firing if the boiler water temperature (i.e. the input to the DHW Heat exchanger" is likely to...
  2. Well I can now report I've solved this problem...

    Well I can now report I've solved this problem and got it working... see this post Success
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    Hi, I wrote the orignal post in this thread......

    Hi, I wrote the orignal post in this thread... and finally I'm please to report success.

    I now have hot water at the faucets without a dedicated return line using a tankless heater.

    I've...
  4. No, I am not concerned about the warranty - the...

    No, I am not concerned about the warranty - the unit is more than 5 years old now anyhow.

    But I can't open my walls to put in a dedicated recirc line, and I don't have power under the furthest...
  5. Impact of Water + Gas Use vs. Purchase and Install of Pump

    If you can let me know how you did the calculation to reach that conclusion I'd be interested:

    Option 1: Running water for 3 minutes for each shower, dishwasher run, etc. etc. - plus the gas usage...
  6. Selecting Domestic Hot Water Recirc Pump - Tankless - no dedicated return line

    Hi,

    Looking for a little help selecting a pump to drive domestic hot water recirculation in my home (I am the home owner). I have a tankless hot water heater and no-dedicated return line. I...
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    This is very helpful... Do you have a specific...

    This is very helpful...

    Do you have a specific pump (make, model) in mind?

    Thanks
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    Thanks for your response...very helpful... Its...

    Thanks for your response...very helpful...

    Its good to hear the ACT909 does work if you install it close to the tankless rather than under the furthest sink.. a few follow-up questions...

    1....
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    Thanks for your detailed response /...

    Thanks for your detailed response / thinking...much appreciated...

    The flow switch on the tankless closes a normally open input to the tankless controller. I can trigger the controller to see a...
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    This is very helpful...confirms what I had...

    This is very helpful...confirms what I had suspected... but wasn't certain...

    Any reason why the following wouldn't work:
    1. a more powerful pump (like the Laing [24ft head and 8 GPM]), mounted...
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    Thanks...that is a *VERY* good point. I actually...

    Thanks...that is a *VERY* good point. I actually have two comfort system valves installed...so I'm going to try and remove one of the two comfort system valves and see if it works.

    I had thought...
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    More Ideas on Retrofit Tankless Recirculation

    Symptom is no hotwater at the faucet after pump and tankless has been operating for 10 mins.

    I can hear the pump turning, and I can see the tankless firing... but no hot water ever makes it to the...
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    I'll definitely double check for cross-overs, but...

    I'll definitely double check for cross-overs, but I'm pretty certain I don't have any...thanks for the thought.



    Given the pump has to be able to be "on" while the "comfort valves" are closed...
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    Tankless Recirculation - Redux

    Chuck...I've got the same challenge...but I took a different root to try to solve it...perhaps some of the elements of my solution might also work for you...and / or you might have some suggestions...
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    Tankless Recirculation - Redux

    Hi,

    Didn't want to post to the other current thread on tankless recirculation because I have a slightly different situation / idea

    I have a instant-on domestic hot water boiler (NTI Trinity...
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