You are fine. You have a check valve at the outlet for your HW. There are almost as many bypass designs as there are floor designs.
This pic show the most common ones. You have #4 circled on the middle right.
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Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired
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