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".

  3. Sponsor

    Sponsor Paid Advertisement

  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
Similar Threads: Tankless Water
Forum Title Date
Tankless Water Heater Forum Tankless water heater in crawlspace vent slope. Jun 12, 2017
Tankless Water Heater Forum Exterior vented tankless water heater? May 18, 2017
Tankless Water Heater Forum Tankless water heater maintenance Apr 8, 2017
Tankless Water Heater Forum New to tankless water heater and can't figure it out! Mar 16, 2017
Tankless Water Heater Forum Tankless Water Heater Cleaning Solution? Mar 7, 2017

Share This Page