The number of collectors depend on two things. One, the number of people using water in the home dictates the gallons of hot water needed per day (a good average is 15-25 gallons a day per person). Panel sizing per person is around 13-16 square feet of panel suface area. For example, a household with two people needs about 32 square feet of panel surface area which translates into one 4' x 8' panel (4' x 8' panel = 32 square feet). Two, the panels need to be facing
due south and at an angle of around 40 degrees for best performance. If the home has a sligthly lower roof pitch or if the roof faces just off of south, it usually is not a noticeable difference in performance, but if it is a concern, the addition of an extra panel can be used.
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