One of the things we learned at the MREA fair is that it makes good sense to go with a Solar Hot Water System for pre-heating our household water as well as to use it for our radiant floor heat. Obviously if we are going to use it in the winter, we need to protect it from freezing, which is why we need to use some antifreeze. The antifreeze most commonly used in these applications (usually environmentally conscious people) is Propylene Glycol. Interesting enough I learned that Propylene Glycol is used in ice cream (to prevent it from freezing rock hard). Here is a good article from Tom's of Maine about their use of Glycol and alternatives.
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Tuesday, June 21, 2005
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