VicS
Well-Known Member
Non toxic antifreeze is required in solar water heating systems. Presumably in case of any leakage between the water in the panel, and the domestic water.
Its also used in heat transfer systems in food processing I beleive. "Coolflow" is the name I know of.
Don't know anything about it but there is apparently an additive that can be used in ethylene glycol based fluids that makes them non toxic ! http://www.hydratech.co.uk/news.html