While I was house hunting this past summer, I came across this oil burner system. SIX zones. They had a stat in almost every room. I hadn't realized it until I went into the basement. I took this photo. Does anyone have a system like this? BTW, the house was only 1300Sq Ft.
This is my self-installed sytem from Radiantec. Three zones covers about 2200 sq.ft. Mild winters here, but if I was in a colder climate I likely would have went with 5 zones.