SOLAR HOT WATER pre-heat systems fall into two basic categories active and passive types with numerous subcategories. A passive solar DHW pre-heater is also known as a breadbox heater or batch heater.
IN LAST MONTH'S column ("Active and passive solar pre-heat systems," pg. 36), the final system we addressed was the closed-loop pressurized system. One of this system's major Achilles heels is the ...
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