Viessmann Vitodens 100 Series Installation And Service Instructions Manual page 108

Specification
Specification
UPS 15-70 (rated heating output 35 kW)
700 70
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
108
(cont.)
A
0.5 1
C
B
1.5 2 2.5 3 3.5