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5601 189 v1.1
Vitodens 100-W, WB1B Technical Data
Operation
Heating circuit pumps
Waterside Flow (boiler circuit)
The Vitodens 100-W is designed only for closed loop,
forced circulation hot water heating systems.
Pressure drop (primary circuit) of Vitodens 100-W
Heating circuit pumps (field supplied)
Recommended heating pumps with Vitodens 100-W,
WB1B 26, 35 (without an optional CombiPLUS).
g Grundfos 15-58 (3-speed)
g
Taco 00R
or equivalent
Refer to the graph for the proper waterside boiler friction
loss calculations.
Pump selection must be based on accurate system flow
and pressure drop calculations (including DHW sizing).
A low-loss header must be used when the system flow
rate exceeds the maximum (or minimum) flow rate of
the Vitodens 100-W boiler. An alternative method may
be used, such as primary secondary piping using closely
spaced tees.
A low-loss header offers additional
benefits not provided by a pair of closely spaced tees.
Viessmann strongly recommends and prefers the use
of a low-loss header over closely spaced tees.
Please see page 18 for details.
Use standard friction loss method for pipe sizing.
Observe boiler maximum and minimum flow rate limitations.
If system flow rate exceeds boiler maximum flow rate
(as stated on page 18) or if system flow rate is unknown,
Viessmann strongly recommends the installation of
a low-loss header. See page 18 for low-loss header
information or refer to the Vitodens Venting System
Installation Instructions.
IMPORTANT
ft. m
Pressure Drop
Flow rate
USGPM
L/h
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