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Vitodens 100-W, B1HA series & B1KA Combi Technical Data
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
The Vitodens 100-W B1HA/B1KA comes with a built-in
boiler pump.
All other pumps are field supplied and should be sized
based on pressure drop.
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 17 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 17) or if system flow rate is unknown,
Viessmann strongly recommends the installation of
a low-loss header. See page 17 for low-loss header
information or refer to the Vitodens Venting System
Installation Instructions.
IMPORTANT
Operation
Flow rate
Supply head pressure (water)
