Tankless Coil - which way to clean?

Discussion in 'Boiler Forum' started by olimazi, Jun 8, 2011.

  1. olimazi

    olimazi New Member

    Jun 8, 2011
    Central NJ
    I have a 5gpm tankless coil in my oil fired boiler;
    I've come to the conclusion that it's clogged with minerals
    from the hard water out of my well.
    The cold water pressure is fine - the hot out of the coil is low.

    I found a guy to clean the coil for $225 (I can do it myself with a small transfer pump and a couple of hoses and some CLR, but my wife has no confidence in my abilities as a handyman :( Isolation valves are in place - but the only thing I'm worried about is a clog when flushing then I'll have no hot water.

    Question is:
    Should the coil be flushed from the cold water side out the hot side - or should the acid be circulated in reverse, from hot side to cold?
    I've heard it has less of a tendency to clog when flushed in reverse, but I don't see how.

    Thanks - any suggestions appreciated.

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