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Low-Loss Header Information
Low-Loss Header Application
Sizing of Low-Loss Header in a Residential/Commercial Single-Boiler Application
Boiler
No. of
Boiler
Model
Boilers
Max.
Flow
Rate
B2HA
1
25
100,
(5700)
352
Sizing of Low-Loss Header in a Commercial Multiple-Boiler Application
Boiler
No. of
Boiler
Model
Boilers
Max.
Flow
Rate
B2HA
2
25
100,
(5700)
352
B2HA
3
25
100,
(5700)
352
B2HA
4
25
100,
(5700)
352
B2HA
5
25
100,
(5700)
352
B2HA
6
25
100,
(5700)
352
B2HA
7
25
100,
(5700)
352
B2HA
8
25
100,
(5700)
352
Note: for multiple boiler applications when using the Vitodens 200-W, B2HA boilers, refer to the multiple boiler
low-loss distribution manifold installation instructions.
*1 For system t <20°F use low-loss header sizes for t 20°F.
14
(continued)
Total
Typical System Flow Rates
Flow
Rate
t
*1
25
System Flow
(5700)
Rate
LLH Required
LLH Model
Total
Typical System Flow Rates
Flow
Rate
t
*1
50
System Flow
(11400)
Rate
LLH Required
LLH Model
75
System Flow
(17100)
Rate
LLH Required
LLH Model
100
System Flow
(22800)
Rate
LLH Required
LLH Model
125
System Flow
(28500)
Rate
LLH Required
LLH Model
150
System Flow
(34200)
Rate
LLH Required
LLH Model
175
System Flow
(39900)
Rate
LLH Required
LLH Model
200
System Flow
(45600)
Rate
LLH Required
LLH Model
Vitodens 200-W B2HA 88-150, 311- 530 Technical Data
°F
20
25
(°C)
(11)
(14)
GPM
33.3
26.6
(L/h)
(7563)
(6051)
Yes
Yes
120/80
120/80
°F
20
25
(°C)
(11)
(14)
GPM
66.6
53.3
(L/h)
(15128)
(12102)
Yes
Yes
200/120
200/120
GPM
100
80
(L/h)
(22692)
(18153)
Yes
Yes
250/150
200/120
GPM
133
106.6
(L/h)
(30255)
(54204)
Yes
Yes
300/200
250/150
GPM
166.5
133
(L/h)
(37816)
(30253)
Yes
Yes
300/200
300/200
GPM
200
160
(L/h)
(45383)
(36307)
Yes
Yes
400/200
300/200
GPM
233
187
(L/h)
(52947)
(42377)
Yes
Yes
400/200
300/200
GPM
266.4
213
(L/h)
(60510)
(48409)
Yes
Yes
450/250
400/200
30
35
40
(17)
(19.5)
(22)
22.2
19
16.7
(5042)
(4322)
(3781.6)
Optional
Optional
Optional
120/80
80/60
80/60
30
35
40
(17)
(19.5)
(22)
44.4
38.1
33.3
(10085)
(8644)
(7564)
Yes
Yes
Yes
160/80
160/80
120/80
66.6
57
50
(15128)
(12967)
(11346)
Yes
Yes
Yes
200/120
200/120
200/120
89
76
66.6
(20170)
(17289)
(15128)
Yes
Yes
Yes
250/150
200/120
200/120
111
95
83
(25211)
(21609)
(18908)
Yes
Yes
Yes
250/150
250/150
250/150
133
114
100
(30255)
(25933)
(22692)
Yes
Yes
Yes
300/200
250/150
250/150
155.4
133
117
(35298)
(30255)
(26473)
Yes
Yes
Yes
300/200
300/200
250/150
178
152
133
(40341)
(34578)
(30255)
Yes
Yes
Yes
300/200
300/200
300/200
Viessmann
Low-loss
Temp.
Sensor
Required
Supplied
Viessmann
Low-loss
Temp.
Sensor
Required
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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