Hey all. As you know in May 2013 many regions will have a new minimum efficiency for furnaces which will require condensing units. I have been notifying clients with older units about this and informing them of the added cost once we can no longer install 80%. I have also let them be aware of the difficulty venting a 90 in many cases.
My question is, does anyone know of any waivers to this new law? Sure enough yesterday I was on a no heat call on one of the original Carrier 80's. That unit with the two boards, one up by the inducer. I got him going but told him he better decide before May what he wants to do. Sure enough this was a condo with no way possible to vent to the outdoors with PVC!
He has a Bvent that runs up through second floor but I did not get into checking it out. This poses another question. Let's say you run into one of these scenes with say a straight shot chimney or Bvent that could be used as a chase for PVC. Years back I used the chimney as a means to run PVC for an Amana HTM/w dhw. My question is if this is doable as a last resort to vent PVC it means the water heater would have to be a PVC vent model as well. Has anyone tied a 90 furnace and fan vented PVC water heater into a common PVC vent?
This DOE ruling is going to open up a rat nest!