Viessmann Vitodens 200-W B2HA Application Manual page 24

Vitodens 200-W, Technical Data
Waterside Flow (primary circuit)
The Vitodens 200-W, B2HA is designed for closed loop,
forced circulation hot water heating systems only. 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 below), falls below the minimum flow rate
or if system flow rate is unknown, Viessmann strongly
recommends the installation of a low-loss header.
An alternative method may be used, such as primary
secondary piping using closely spaced tees.
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A low-loss header offers additional benefits not provided
by a pair of closely spaced tees. Viessmann therefore
strongly recommends and prefers the use of a low-loss
header over closely spaced tees. Once the low-loss header
is connected, the built-in low-loss header logic of the
Vitodens 200-W boiler ensures the required rt across the
system through the sensory communication between the
low-loss header and the boiler.
Flow rate
Flow rate
Pressure drop (primary circuit) for
Vitodens 200-W, B2HA 88, 100
For sizing an on-site circulation system.
Max. flow rate: 25 USGPM (5700 L/h)
Pressure drop (primary circuit) for
Vitodens 200-W, B2HA 112, 150
For sizing an on-site circulation system.
Max. flow rate: 38 USGPM (8600 L/h)