1. 

   tonyc37 New Member

   Messages:

   1

   Location:

   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.

   tonyc37, Mar 3, 2013

   #1
3. 

   johnjh2o1 Plumbing Contractor for 49 years

   Messages:

   1,141

   Location:

   South*East

   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".
   
   John

   johnjh2o1, Mar 3, 2013

   #2
4. 

   Terry Administrator Staff Member

   Messages:

   14,780

   Location:

   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

   Terry, Mar 3, 2013

   #3

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