Just a quickie post to answer a question. Why all of a sudden, are we getting the hot water heater venting into the room. Well, the furnace is only 1 1/2 years old and last summer was cool. So the possibility of the air being on and then the water heater coming on was very slim. In the morning and evening when we would most likely use the hot water, we'd have the windows open and no air on. In the winter, the furnace has a 2 stage fan, it only uses the high speed when we crank up the heat upon arriving home from work. And we wouldn't use hot water at that point normally either.
This last weekend was very warm, so we had the air on all the time. And that's the only time when the heater comes on, that it vents into the room. And not even all the time then. And remember, if the water heater is on before the air comes on, it's not a problem either.
So since this seems to be a very limited occurrence, I'm not sure what we'll do about it. I guess we'll see how much that fresh air thingy will cost first.
Maybe we'll just make sure we don't run the air when we do laundry. :-)