Aqua-Hot 600-D Installation Manual page 51

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Antifreeze Mixture Water Quality:

In order to ensure maximum performance and longev-

ity of an Aqua-Hot heating system's boiler tank and

associated components, it has been determined that

there is a need to use distilled, de-ionized, or soft water

in combination with concentrated propylene glycol for

the Aqua-Hot's antifreeze and water heating solution.

Please note that this is only necessary when mixing

concentrated propylene glycol antifreeze with water;

suppliers of pre-mixed antifreeze are responsible for

the use of high-quality (distilled, de-ionized, or soft)

water when preparing their antifreeze for sale.

appendix E: antifreeze Mixture Water Quality

600-D Hydronic Heating System Installation Manual

Hard water possesses a high-level of calcium and

magnesium ions, which deplete the propylene glycol an-

tifreeze's corrosion inhibitors. This, in turn, causes the

antifreeze and water heating solution to begin turning

acidic, which can corrode the Aqua-Hot's Boiler tank

and associated components prematurely. Therefore,

concentrated propylene glycol should be diluted with

distilled, de-ionized, or soft water which is 80 ppm or

less in total hardness. The local water agency should

have up-to-date water quality reports which should

indicate if the local tap water is within this guideline.

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