ok new to this because i never really needed help. So this is what i have going. My sister and my brother inlaw built themselves a nice appartment in the basement so we had to plumb in heat. The system we have is an oil burner boiler setup with two zones and two recirculater pumps,that looks like it is controled by the master relay that has all the sensors and a second one the controls the second pump.To me i see kind of how they work together....confusing....well alittle but i think i got it. Now the new piping is installed the same as the first two zones but the wiring has me unsure how to get the third zone working without an over load on the system....going by how i see it wired now. The question is can i get a switching relay that will work all three zones or should i just get one more relay and wire that in and how. One that does all three would be easy...any help would be great.....thanks.

I have an old ARCO/Ideal heater driving a convection fed hot water/radiator system. The water temperature is manually set, but it needs to go higher when it's colder outside, and lower when I need heat but it's not so cold. Is there an automated way to do that? Generally (night time temps at 20(+/-5)F), the heater will get the system up to heat (120F) in 20-30 minutes or so, and the cast iron will dissipate it over a few hours, so the whole system runs less than an hour a day 95% of the time, but it needs to get to a higher temp (150F) when the outside temp approaches 0. Best case is it automates to a inverted scale evenly over that range.