Hi Tom, you get appx 1gal. Of sap per tap with gravity on a good days run. It takes 40 gallons of sap to make 1 gallon of syrup. How are you planning to boil it? I started with 5 gallons of sap, a turkey fryer and a roasting pan. 6 hours later, I had 12oz of syrup. Two words of warning:
Stove top boiling, will remove wallpaper.
Success may lead to maple madness, and there is no cure.