GBlist: Solar hot water heat exchange fluids.

McCune (
Wed, 19 Mar 1997 12:13:24 +0000

I'm looking into retrofit alternatives to ethylene glycol for closed
loop solar hot water systems. I've had polyethylene glycol

Who can suggest suppliers of PG? How toxic is it? Are there different
grades available.

I've heard of "food grade" PG.
I've heard that diesels and some rec vehicles use PG, maybe different
What performance differences might be expected compared to EG in this

Thanks for any help,

540-894-5126 Twin Oaks
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