Click here to Find a Contractor in your area.
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Need to contact us? Visit

Heat Loss up chimney for water heater

JfontoJfonto Member Posts: 43
Anyone know what the heat loss for a chimney,with only a hot water heater on it , would be.

I'm think of going to a direct vent unit and block off chimney.


  • JfontoJfonto Member Posts: 43
    To be specific,

    what's the heat loss from the draft drawing out heated air and sucking in cold?
  • chapchap70chapchap70 Member Posts: 130
    It Depends

    Obviously, the colder the outside temperature and/or the higher the water temperature in the heater, the greater the heat loss.  A direct fired water heater can lose 8 degrees per hour when really cold.  A direct vented water heater will have heat loss as well (maybe not quite as much?) unless there is insulated venting with a damper (which I'm not sure is available or practical). 

    My thinking without really investigating it is it would not pay to do this.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!