The rule of thumb of 1-3 gallons of storage per ft2 of collector will
only get you so far, so it is best to try being creative with
your storage. As your load increases in the winter and
production decreases, you should adjust your storage capacity
accordingly. Even slight changes from day to day in your
production vs. consumption, can dramatically affect total
system performance. Tank prioritization allows you to maintain
a target temperature in one tank while still charging another.
Better yet, you may be able to run directly from your solar field
to your heat load and bypass the tank altogether. With the
use of aquastats and 3-way solenoid valves this can easily be
accomplished for the greatest solar return
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