Viessmann Vitodens 100 Series Installation And Service Instructions Manual page 106

Specification
Specification
Residual head of the integral circulation pump
UPS 15-50 (rated heating output 19 kW)
600 60
500 50
400 40
300 30
200 20
100 10
0
0
0
Flow rate in m³/h
A Stage 1
B Stage 2
C Stage 3
106
(cont.)
C
B
A
0.5 1 1.5 2 2.5 3