CA, we installed a water treatment system but only for our kitchen. We got the two filter system, one step below RO.
As far as the hot water. Before you install it, I would reference an article in Consumer Reports. They did one a few months back and do not recommend them due to the fact they don't do what they say as far as how hot the water actually gets and the cost payback time.
We had thought of getting it installed in our Alabama house, but changed our minds after reading it.
Army Guy
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Scouts Out!!!! 
NJ, PA, NC, AL, Germany, etc, etc and finally The Village of Bonita.
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