Below is a geographical chart which shows the northern sections, central sections and the southern sections. The northern climates have much colder incoming ground water than the central or southern states. So as an example, say you live in Maine, then you would want to choose a gas or electric tankless based off the blue chart as these will give you nice hot water still due to the colder incoming ground water. If you live say in Florida or one of the southern states where the incoming ground water is warmer than you could use any of the gas or electric tankless water heaters. Then you would need to make a decision on the correct tankless based on the number of sinks, showers washing machines you would use at one time. This information is covered in our Blog called: Determing The Proper Tankless Water Heater.
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