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Hot Water - Fixture Units

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Is there something special that needs to be done to calculate Hot Water fixture units? They never seem to calculate back from each fixture point where the fixed unit is applied. I double checked to make sure the arrows are pointing away from the water heater towards each fixture, as well as making sure the sizing table is all the same.

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Looking at the project you sent previous, it looks like the initial pipes in your hot water systems are 0-length pipes. They are vertical pipes that start and end at the same elevation. If you adjust that to give them length, the calculation should work.

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