I picked up a 3psi gauge and dialed my presuretrol to cut out at 1.5 pounds and cut in at .5 pounds. But I wonder if I can tweak the pressures to be more efficient. How do I calculate the exact pressures I should be running at?
I can measure my mains and the length of pipe plus elbows. Which one governs? The longest one? Then, what pressures would be correct?
Use your gauge, to see the back-pressure of venting, and add main vents until the pressure is a couple of ounces, during the venting phase.
You probably could heat the house with 2 ounces, unless your boiler is over-sized.--NBC