as mentioned before: i have a harmon sf160 add-on wood boiler in line with a utica oil boiler. when i built my house, all of the armstrong circulators were just one speed. last year when i installed my harman, i learned that armstrong now makes them all 3-speed. so, the question: the circulator that runs constant between my two boilers has always been set on 1 (of 3). should i allow it to run faster (to more quickly pull cooler water into the wood boiler. or, should it run slower(the way it has been), so the water spends more time in the wood boiler to heat up before going into the supply side of the oil boiler? 2nd question: i have 4 radiant floors in my house 2 small bathroom, 1 large bath and the kitchen (biggest). all on the first floor except 1 small bath upstairs. lately, i have not felt much warmth in the hallway bath on the first floor (1 small bath) all of the floors are pretty equal distance from the boiler.how do i fine tune the manifold so i have even flow thru all zones? there is a white knob on the bottom of the return-side manifold for each zone. there is also an allen-key screw adjustment behind a brass cap on the supply side manifold for each zone. currently, i have the allen-screws on the supply side for each zone run in halfway. i have the white knob on the return side of (the bath that isnt getting much heat) wide open. all of the others are set about halfway. how should these adjustments be set?