Pipe Size & Flow
Velocity check (≤1.5 m/s domestic)
L/min
Reading 12 L/min
m/s
Domestic typical 1.5 m/s; mains/risers up to 2.0 m/s.
Results
Velocity
0.62m/s
OK
✓
Pipe ID20.2 mm (22 mm OD)
Flow rate12 L/min
Velocity limit1.5 m/s
Suggested Materials
22mm copper tube (3m length)
Order length to suit run
4 pc
22mm × 90° elbow (end-feed)
8 pc
22mm straight coupling
6 pc
Solder & flux (lead-free)
1 pack
Pipe clip 22mm
20 pc
Estimates use standard UK trade rules of thumb. Always check the bag/spec on the day.