Yes I have, I live in Illinois. We installed new plumbing and water heater when bought new house. I recommend to hire some professional backflow companies for example https://www.americanbackflowprevention.com/ they have really skilled technicians in their related fields. Try contact them with your questions.
A best water heater would be an electrical water heater with a coil and a tank that is copper or glasscoated as copper tank water heaters are not in production at a large scale glass coated water heaters with Puf injection in between abs bodies are the best
Brands like Haier ,eurohot and ferroli have these features