Im aware of strips being different but original FlexWatt had copper showing. I have original 11 inch FlexWatt for back heat that i soldered. But after redoing my plastic rack the top tub is getting less heat than the rest. Tired of resetting thermostat 2-3 times a week. So after investigating my soldering work some of the 3 inch FlexWatt was melted thru, basically not type of connection on several. So ordered THG cause of rivet/grommet design. Easier for me.

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