13
1293809-W2-E
Use the table below to calculate the actual head of water (x) needed in your
installation.
A = Total length of 15 mm pipe in hot water supply pipe run*
B = Total length of 22 mm pipe in hot water supply pipe run*
C = Total length of 15 mm pipe in cold water supply pipe run*
D = Total length of 22 mm pipe in cold water supply pipe run*
*Measure from the base of the cold water cistern to the relevant inlet port on the
Mira Event XS.
Size
Hot Water Supply
Cold Water Supply
Pipe Run / Qty of Elbows
Head Loss
(mm)
Pipe Run / Qty of Elbows
Head Loss
(mm)
15 mm Pipe A x 120
......... x 120
C x 120
......... x 120
22 mm Pipe B x 20
......... x 20
D x 20
......... x 20
15 mm
Elbow
No of
Elbows
......... x 55
No of
Elbows
......... x 55
22 mm
Elbow
No of
Elbows
......... x 15
No of
Elbows
......... x 15
Add the minimum effective
head required
+80
Add the minimum effective
head required
+80
Required head of water =
x mm
Required head of water =
x mm
Example:
With A = 1.5 m, B = 2.5 m, C = 2.2 m, D = 0 m.
Size
Hot Water Supply
Cold Water Supply
Pipe Run / Qty of Elbows
Head Loss
(mm)
Pipe Run / Qty of Elbows
Head Loss
(mm)
15 mm Pipe A x 120
1.5 m
x 120
180
C x 120
2.2 m
x 120
264
22 mm Pipe B x 20
2.5 m
x 20
50
D x 20
0 m
x 20
0
15 mm
Elbow
No of
Elbows
3
x 55
165
No of
Elbows
3
x 55
165
22 mm
Elbow
No of
Elbows
2
x 15
30
No of
Elbows
0
x 15
0
Add the minimum effective
head required
+80
Add the minimum effective
head required
+80
Required head of water =
x mm
505
Required head of water =
x mm
509
