You can run on either source, but you can also run on both. Running on both gives you faster "recovery" when you're using the hot water, as it heats the water using both elements.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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