Waterline sizing is a balance: too small can mean noisy, high-velocity runs and pressure loss; too large can waste material and slow hot-water delivery. The planner shows the tradeoff section by section.
WHAT IT DOES
Useful detail without the spreadsheet.
01
Two demand methods
Use WSFU with Hunter’s Curve for diversified demand or direct GPM for a simple peak-flow sum.
02
Independent hot + cold trees
Build each leg separately so fixtures and loads stay attached to the pipe that actually serves them.
03
Hydraulic checks
See actual velocity and Hazen-Williams pressure drop behind the recommended PEX-A size.
USE IT WHEN
The answer needs to travel with the work.
✓Laying out a new house or remodel before rough plumbing
✓Comparing conservative, standard, and aggressive sizing targets
✓Checking whether a long branch needs to step up in size
