I have a theory. I have never looked at the internals to a heater before. But it would make sense to me to pulse the heat on and off. For the thermistat to work properly you would want the heating element turned off so that you can get a better water temperature. Remember that it will be hotter inside the heater then out.
this is just a theory and not fact...now i feel the need to test this theory with my heaters!
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500G Mixed Reef
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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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