The Planted Tank Forum - View Single Post - DIY External Heater (56k!)
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post #33 of (permalink) Old 10-05-2007, 04:46 PM
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Location: NW Oregon
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Most heaters have a line marked on them that indicates minimum water height. The thermostat is typically just below this line. it that area's not in contact with the water, you're not going to get good regulation.
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