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Vitodens 100-W, B1HA series & B1KA Combi Technical Data
Maximum Flow Rates
Vitodens 100-W, B1KA 35, 125 with one heating circuit
without LLH
Note:
The use of a low-loss header is recommended if the
water flow rate is less than 1.7 GPM (400 L/h) or
more than 6.2 GPM (1400 L/h).
The low-loss header is available as an accessory part.
System Layout 6
Installation
Model B1KA
35, 125
Output MBH
117
t
30ºF (17ºC) rise GPM (L/h)
7.8 (1772)*
35ºF (19.5ºC) rise GPM (L/h)
6.7 (1522)*
40ºF (22ºC) rise GPM (L/h)
5.9 (1328)
* Requires low loss header or closely spaced tees.
Legend
AV Air
vent
PRV Pressure relief valve (boiler)
DPRV Pressure relief valve (DHW 150 psi)
WSE Water softener equipment
DHW Domestic hot water
DCW Domestic cold water
A
Vitodens 100-W gas-fired condensing boiler
B
External system controller (field supplied)
C
Heating
circuit
D
Heating circuit pump with room thermostat
connection (field supplied)
E
Closely spaced tees, 4x pipe Ø or 12 in. (305 mm)*
1
F
Outdoor temperature sensor (OTS)
*
1
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.
See page 17 for details.
