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Green Plumbing

Category - Solar Hot Water

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Which of the following is the most common type of freeze protection for use with open loop solar thermal systems?

Drain-down
Dribble valve
Manual drain-down
Recirculating

Explanation

Answer: D - A recirculating control strategy is the most common type of freeze protection for use with open loop solar thermal systems. The other three options are viable systems as well; all four of them can be used either alone or in combination with one or more of the others, in particular as recirculating freeze protection is only available in a limited geographic area. The piping for supply and return will also need freeze protection.

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