Aqua-Hot 375-LP Installation Manual download pdf (Page 49)

375-LP Installation Manual

— Page 49 —

APPENDIX C: ANTIFREEZE TYPES

APPENDIX D: ANTIFREEZE MIXTURE WATER QUALITY RECOMMENDATIONS

The following information addresses the necessary

usage of a propylene glycol based “boiler” type anti-

freeze in the Aqua-Hot. Propylene glycol is a safer

alternative to the more toxic ethylene glycol anti-

freeze; however, as mandated by IAPMO

(International Association of Plumbing and Me-

chanical Officials), only those propylene glycol based

“boiler” type antifreezes deemed “Generally Recog-

nized as Safe” (GRAS) by the FDA should be util-

ized.

Because of the significant impact various types of

antifreeze can have on a hydronic heating system,

including the level of safety provided, it has been

recognized that there is a need to provide an expla-

nation regarding two additional prominent types of

antifreeze/coolant available. The following informa-

tion should be utilized as an educational means of

ensuring that the proper type of propylene glycol

based antifreeze is selected:

RV & Marine Antifreeze:

These types of propylene glycol based antifreeze

products are formulated specifically for

“winterizing” applications only. Although RV &

Marine antifreeze is often “Generally Recognized as

Safe” by the FDA, it should never be used in the

Aqua-Hot’s Hydronic Heating System. This type of

antifreeze is not formulated to transfer heat, which is

essential to the heating system’s functionality and

does not contain rust inhibitors. Please note, how-

ever, that RV & Marine antifreeze can be utilized to

winterize the Aqua-Hot’s Domestic Hot Water

Heating System.

Automotive Antifreeze/Coolant:

These types of propylene glycol based antifreeze

products are formulated specifically to protect auto-

motive engines against corrosion, freezing tempera-

tures, and overheating. They also have excellent

heat transfer and thermal conductivity characteris-

tics. Although these types of antifreeze products are

considered less toxic and safer than ethylene glycol

for people, pets, and the environment, they are not

“Generally Recognized as Safe” (GRAS) rated by the

FDA. Therefore, they must be marked with a

“harmful if swallowed” warning. This additional

warning is required because these types of antifreeze

products contain high levels of chemical rust inhibi-

tors. Due to their potentially hazardous properties,

they should never be used in the Aqua-Hot’s Hy-

dronic Heating System.

In order to ensure maximum performance and lon-

gevity 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 propyl-

ene glycol for the Aqua-Hot’s antifreeze and water

heating solution. Please note that this is only neces-

sary when mixing concentrated propylene glycol an-

tifreeze with water; suppliers of pre-mixed antifreeze

are responsible for the use of high-quality (distilled,

de-ionized, or soft) water when preparing their anti-

freeze for sale.

Hard water possesses a high-level of calcium and

magnesium ions, which deplete the propylene glycol

antifreeze’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 pre-

maturely. 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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Aqua-Hot 375-LP Installation Manual Page 49

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