New Tankless Water Heater

Discussion in 'Tankless Water Heater Forum' started by tonyc37, Mar 3, 2013.

  1. tonyc37

    tonyc37 New Member

    Mar 3, 2013
    Lenexa, KS
    I need a new water heater and I am thinking about a tankless unit.What I want to know is can I vent it through the existing vent from my old water heater or do I have to run a new vent.
  2. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Aug 9, 2009
    Tank-less heaters need a 4" vent. Most tank type heaters are 3". Plus you may need a larger gas line. Tank-less are 3/4" and tank type are 1/2".

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  4. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    A tankless water heater is much more efficient which means more moisture in the exhaust. You "can not" use the old chimney.

    You will need either a new plastic or a new stainless. Most are being done with plastic.
    The old galvanized steel won't cut it.
    Last edited: Mar 3, 2013
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