If you are getting a burst of hot water, and then goes cold, I would have to gamble that the bypass valve is still open. You need to close the valve that goes between the inlet and outlet lines.
If that valve was left open, you may not have gotten a good flush in the water heater, either.
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Chap , DW Joy, and Fur Baby Sango
2017 F350 Lariat CCSB, SRW, 4x4, 6.7 PS
2017 Grand Design Reflection 337RLS
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