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glycol instead of drain back?

drain Glycol
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glycol instead of drain back?

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Using glycol and a heat exchanger means absolute freeze protection. There is always a chance that the drain back will fail and pipes will freeze.

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Using glycol and a heat exchanger means absolute freeze protection. There is always a chance that the drain back will fail and pipes will freeze. However, a manual drain back in a basic, manual control integrated system also has 100% freeze protection.

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