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Technical Data
Waterside Flow (primary circuit)
The Vitodens 200 is designed only for closed loop, forced circulation
hot water heating systems.
Pressure drop (primary circuit) of Vitodens 200
26
8
23
7
6
19.7
16.4
5
13.1
4
9.8
3
6.6
2
3.3
1
0
0
0
1.1
2.2
0
250
500
Flow rate
Typical System Flow Rates
Model
WB2
6-24C*
∆
t for NG
Output (NG)
81 000
Btu/h
20 ºF rise (GPM)
8.1
25 ºF rise (GPM)
6.5
30 ºF rise (GPM)
5.4
35 ºF rise (GPM)
4.6
40 ºF rise (GPM)
4.1
∆
t for LP
Output (LG)
73 000
Btu/h
20 ºF rise (GPM)
7.3
25 ºF rise (GPM)
5.8
30 ºF rise (GPM)
4.9
35 ºF rise (GPM)
4.2
40 ºF rise (GPM)
3.7
Use standard friction loss method for pipe sizing.
Observe boiler maximum flow rate limitations. If system flow rate exceeds
boiler maximum flow rate (as stated on page 4) or if system flow rate is unknown, Viessmann strongly
recommends the installation of a low-loss header. See page 29 for low-loss header information.
8
4.4
6.6
8.8
1000
1500
2000
6-24
8-32
11-44
81 000 112 000 153 000 205 000
8.1
11.2
15.3
6.5
9.0
12.2
5.4
7.5
10.2
4.6
6.4
8.7
4.1
5.6
7.6
73 000 101 000 138 000 191 000
7.3
10.1
13.8
5.8
8.1
11.0
4.9
6.7
9.2
4.2
5.8
7.9
3.7
5.1
6.9
GPM
11
13.2
15.4
2500
3000
3500
ltr/h
A low-loss header must be used when the system flow
15-60
rate exceeds the maximum flow rate of the Vitodens 200
boiler (as stated on page 4). Once the low-loss header
is connected, the built-in low-loss header logic of the
20.5
Vitodens 200 boiler ensures the required
16.4
system through the sensory communication between the
low-loss header and the boiler.
13.7
11.7
*Please note that the low-loss header cannot be used
10.2
with the Vitodens 200, WB2 6-24C Combi boiler.
19.1
15.3
12.7
10.9
9.6
Pressure drop up to model WB2 8-32
Pressure drop model WB2 11-44 and up
t across the
∆
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