I'm just saying it's hard to quantify. not all atmospheric vent through a masonry chimney. Some vent through a b vent through the roof.aqnd wrote: ↑Oct 28th, 2017 11:31 amThey come in both 1 and 2 pipe models. You would want the two pipe model.
Any house that has a chimney is old enough to already be very leaky and have lots of air exchange even without a hole in your house.
Any new house you would not be able to add a chimney, only side wall direct vent. In which case the point is moot, you're going to have the choice of powered or unpowered direct vent anyway.
Heating season is the single largest cost of energy in our homes, I wouldn't discount something by saying it only matters during heating season. That's when it matters the most if you're talking about reducing energy costs.
Power vents only vent to the outside. I think you are referring to a direct vent? In any case you are now looking at even more money for the install and the unit itself for a unit using outside air for combustion.
In a new home, it's definitely moot. And frankly it's much cheaper for builders to power vent than put in b vent so it's not even an options for lots of reasons.
But for someone to switch from atmospheric to PV, expecting to save money? the ROI is just not there to make the decision based on cost savings. There are other factors to consider of course.