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
What to buy — 5 items
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
Opens at Screwfix, Toolstation and the merchants for your trade. Free account, no card.
Estimates use standard UK trade rules of thumb. Always check the bag/spec on the day.