How do I properly size my storage tank for the collector area?

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