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The following information addresses the necessary us-
age of a propylene glycol based "boiler" type antifreeze
in the Aqua-Hot. Propylene glycol is a safer alternative
to the more toxic ethylene glycol antifreeze; however,
as mandated by IAPMO (International Association of
Plumbing and Mechanical Officials), only those pro-
pylene glycol based "boiler" type antifreezes deemed
"Generally Recognized as Safe" (GRAS) by the FDA
should be utilized.
Because of the significant impact various types of anti-
freeze 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 explanation regarding two
additional prominent types of antifreeze/coolant avail-
able. The following information 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 prod-
ucts are formulated specifically for "winterizing" appli-
cations 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
© 2008 Aqua-Hot
®
600-D Hydronic Heating System Installation Manual
appendix D: antifreeze types
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, however, 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 prod-
ucts are formulated specifically to protect automotive
engines against corrosion, freezing temperatures, and
overheating. They also have excellent heat transfer and
thermal conductivity characteristics. 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 chemi-
cal rust inhibitors. Due to their potentially hazardous
properties, they should never be used in the Aqua-
Hot's Hydronic Heating System.
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