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Domestic coil tie in to tankless water heater

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by Flem, Jul 6, 2013.

  1. Flem

    Flem Member

    Joined:
    Dec 12, 2009
    Messages:
    131
    Loc:
    Western MD
    Is it possible to tie in an Ecosmart tankless water heater passed my boiler's domestic coil? I was thinking about shutting the oil boiler off during warm months and just use it to heat the domestic water when it is already fired up during colder months. Make any sense?

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  2. mustash29

    mustash29 Feeling the Heat

    Joined:
    Feb 6, 2012
    Messages:
    341
    Loc:
    SE CT
    I would plumb it in a series / parallel configuration with extra isolation valves so you can easily run it either way.

    It would be ok to run the DHW through the furnace coil first, and then let it's output feed the Ecosmart (as a backup function) during heating season. I would not run it this way when the boilers is off line though, your cold incoming water will cause bad condensation in the oil boiler.

    During oil boiler off periods, bypass the boilers coil and run your cold feed directly to the Ecosmart.

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