I keep the pump running 24\7, and I also have a 007 on the oil burner side of the exchanger that runs 24\7 ,and then when zone valve opens, I have another 007 that comes on and sends it up stair's! I just don't under stand why I can't get the 180 -185 in the house, when my 6048 is @ 195 with no load! Even when it's 60 out and iam sorry I hijacked this post I just realized it, again iam sorry!