Important objectives include the
provision of a solar heating system which is self-pumping by means of
geyser pumping without use of electrical energy or pumps, yet which has
the desirable features of a pumped loop system, namely optimum location
of system components such as a storage receptacle located below the
solar collector; the provision of a system which is self-regulating and
operates on demand when the positive temperature difference between the
solar collector and the storage receptacle is great enough, requiring
no sensors, controllers, or valves; the provision of a system which
does not thermosiphon or pump backward when not operating and,
therefore, does not lose heat from the storage receptacle; the
provision of a system which requires little or no maintenance, has a
long lifetime and a low lifetime cost.
See
US patent number 4,478,211 here.
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