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Louisiana code for Backflow preventer on solar hot water systems
I have been talking with a gentlemen in New Orleans about solar thermal. He is having problems selling the systems because the Dept. of health demands that a backflow preventer is put on the main water line coming into the house, thus creating a higher cost to the customer.
I understand why back flow preventers are put on residential and commercial water systems, (kind of, I don't understand where contamination would come from) But why, on a solar thermal system would you need a backflow preventer on the main water system coming into the house?
Here is a link about the Louisiana code:http://www.lses.org/problems-heating-up-for-solar-water-heater-installations-in-la/