My question is this. What temperature setting for the hot water will provide the most economical cost in oil consumption?

I currently keep the low end on the hot water at 130 deg. I dont like the water any hotter than that. But, when the oil burner kicks on to heat the house, naturally, the hot water temp goes way above that, due to the burner heating the water that is flowing through the baseboard heat to the temperature it needs to be to do its' heating.

Does it make sense to kick the temperature of the hot water up a bit, so the furnace doesnt have to kick on as often to heat the water to the temperature that is needed to flow through the baseboard heat.

If I keep the hot water temperature lower, the furnace wont kick on as often. If I raise it, the furnace will come on more frequently to keep the temperature higher, so isn't there really no difference?

And, by the way, what is the temperature that will kick on the heat pump to pump water through the system once it is warmed up?