The incoming water from the OWB is nice and hot ranging from 180 to 195. When all 4 zones are calling for heat, the water temp returning to the OWB is a delta T of 20 to 25. I have baseboard emitters throughout my house with exception of the kitchen, it has a wall hung convector. My set up is, I have the water constantly circulating between the oil burner and FPHX. The water temp inside the oil burner fluctuates between 140 and 150 degrees. This causes the wall convector in the kitchen to run continuously, although it's a comfortable 70 degrees in there. The circulators at the OWB and between the oil burner and FPHX are Grundfos 22-99, each set to the number 2 position. My question is; if I turned up the speed on the circ between the oil burner and FPHX to the number 3 position, will it help or hinder with the water temp inside the oil burner? I'm trying to get the water inside my oil burner as hot as I can, which is the reason for turning up the speed on the circ. In my feeble mind, this makes sense. I will add it's a comfortable 70 degrees inside this 1840's farmhouse. The outside temp this morning is around -10 without the windchill factored in. Thanks. Roger