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tankless water heater as a solar water heater backup

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diyguy
diyguy Member Posts: 2
in Domestic Hot Water

Trying to figure out how to use tankless water heater as a backup for Buderus 80 gal indirect water hater with 2 coils Any suggestions. ?

Comments

  • Ironman
    Ironman Member Posts: 7,904

    I’m assuming that the top coil is solar and the bottom connects to a boiler?

    If so, just pipe the tankless in series with the indirect’s hot line going into the tankless’ cold inlet.

    Set the indirect’s aquastat about 10* higher than the tankless.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    bjohnhydiyguy
  • diyguy
    diyguy Member Posts: 2

    There is no boiler I want to use Solar as main source -bottom coil And Tankless as axillary in top coil. I'm in SC

  • hot_rod
    hot_rod Member Posts: 27,566

    typically the solar is the pre heat to the tankless. Tankless in series on the potable side, not to the coil.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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