HOW CAN YOU TELL THE TEMPERATURE IN YOUR CURRENT WATER HEATER ?
CURRENTLY, YOU CAN NOT!
The best way to do this is to measure it in the morning, before anyone in your home has used any hot water. Turn on the hot water at the kitchen sink and let it run for 2 minutes. Then, using either an outdoor thermometer or a candy thermometer, hold the thermometer in the stream of the water until the reading stops going up.

With DigaHOT you have no problem to read the temperature at the bottom of your water heater, since you can read it on a back lighten screen with big bright digits.
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