Tankless Water heater?

NCFord Posted By NCFord, Mar 24, 2013 at 5:43 PM

  1. NCFord

    NCFord
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    Jun 5, 2011
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    I have a tankless hot water heater and was wondering how to most folks are heating their water with their boiler? I could install a hot water tank and heat it in the winter with a sidearm exchanger and just turn of fthe thankless. I also thought of installing a plate heat exchanger prior to the tankless, but I don't know exactly how the tankless works. I think it works on flow not temp? Any suggestions would help, as I am planning my system. Thanks!
     
  2. BoilerMan

    BoilerMan
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    Apr 16, 2012
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    I think it's best to have two seperate systems. A gas fired tankless is great, but is hard to integrate with other types of heating systems. They do not like pre-heated water, and are not boilers so useing them with an indirect is out as well. I'd use the tankless in the summer, and see if you can find a big indirect or a 40+ gallong electric and heat it via-plate exchanger with your wood boiler.
    Electric tankless are very easy to integrate though as they can be used as booster heaters.


    TS
     
  3. woodsmaster

    woodsmaster
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    Jan 25, 2010
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    How much hot water do you use ? I have a side arm on a 80 gallon tank with no circ. on the domestic side. With a family of five I need 150 deg plus water for it to keep up if we are having a high demand period, baths, dishes laundry all close together. I try to schedule my burn for the peak demand and don't have any problems running out hot water. I think if there was a circ. on the domestic side it would recover faster, but Ideally I'd like to have a flat plate on demand setup to eliminate some of the mixing in storage. I'd oversize it a little to take advantage of the storage since I have low temp emitters.
     
  4. NCFord

    NCFord
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    Jun 5, 2011
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    Thanks, a storage tank works for me... easy and not very much $!
     
  5. NCFord

    NCFord
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    Jun 5, 2011
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    central NC
    Does anyone use just a plate exchanger for hot water? I was thinking if I just unplug my gas tankless during the heating season and install a plate exchanger. I don't know if I could get enough hot water on the domestic side though. any thoughts?
     
  6. heaterman

    heaterman
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    Oct 16, 2007
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    Preheating the water going into the tankless will not work for crap. They operate on not only flow but also temp differential. If your incoming water was at say 100* the tankless would never fire at full capacity if it fired at all.

    We always use a storage tank, size would be your choice, and pump both sides of a plate type HX. If you have a good steady supply of 170-180* water from the wood boiler you can make about all the water you could normally use with a 5x12-10 plate HX.
     

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