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I plan to install a 48vdc 1000watt water heating element in an old Rheem 20gal water tank to use as a pre-heat buffer tank for an infloor hydronic system I put in this past winter. The infloor system has it's own electric boiler so I am just trying to preheat the water to save on...

2-300watt panels that will be roof mounted 48vdc 1000watt water heating element, but my reading suggests a higher resistence AC element may work better as Panels are rarely working at peak. The infloor system has it's own grid tied electric boiler so I am just trying to preheat the water to...