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If a heater is fully submersible yet has a line on it implying water line, does this mean that if the heater is not at this depth at least then it will not properly measure the temperature of the water?
 

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If you have the water BELOW the waterline on the heater and it is plugged in, you are "running it dry" and you stand a good chance of cracking the glass of the heater. Always keep it below the waterline mark.
 

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Ok. I have another heater question I'll start another thread.

You're probably wondering though what this idiot is thinking. Ok well I'm scaping a tank for a friend. He's got this Hagen heater, bit of a relic. It screws on the rim of the tank. The water line is clearly below the heater line. Ive got the tank topped up full. He has used it for years apparently. Anyway, maybe we will replace it.
 
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