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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
38
150,
(8600)
530
Sizing of Low-Loss Header in a Commercial Multiple-Boiler Application
Boiler
No. of
Boiler
Model
Boilers
Max.
Flow
Rate
B2HA
2
38
150,
(8600)
530
B2HA
3
38
150,
(8600)
530
B2HA
4
38
150,
(8600)
530
B2HA
5
38
150,
(8600)
530
B2HA
6
38
150,
(8600)
530
B2HA
7
38
150,
(8600)
530
B2HA
8
38
150,
(8600)
530
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.
16
(continued)
Total
Typical System Flow Rates
Flow
Rate
*1
t
38
System Flow
(8600)
Rate
LLH Required
LLH Model
Total
Typical System Flow Rates
Flow
Rate
*1
t
76
System Flow
(17200)
Rate
LLH Required
LLH Model
114
System Flow
(25800)
Rate
LLH Required
LLH Model
152
System Flow
(34400)
Rate
LLH Required
LLH Model
190
System Flow
(43000)
Rate
LLH Required
LLH Model
228
System Flow
(51600)
Rate
LLH Required
LLH Model
266
System Flow
(60200)
Rate
LLH Required
LLH Model
304
System Flow
(68800)
Rate
LLH Required
LLH Model
Vitodens 200-W B2HA 88-150, 311- 530 Technical Data
°F
20
25
(°C)
(11)
(14)
GPM
49.5
39.6
(L/h)
(11243)
(8994)
Yes
Optional
200/120
160/80
°F
20
25
(°C)
(11)
(14)
GPM
99
79
(L/h)
(22487)
(17990)
Yes
Yes
250/150
200/120
GPM
149
119
(L/h)
(33731)
(26985)
Yes
Yes
300/200
300/200
GPM
198
158
(L/h)
(44974)
(35979)
Yes
Yes
400/200
300/200
GPM
247.5
198
(L/h)
(56213)
(44971)
Yes
Yes
400/200
400/200
GPM
297
237.6
(L/h)
(67461)
(53969)
Yes
Yes
450/250
400/200
GPM
346.5
277
(L/h)
(78705)
(62964)
Yes
Yes
450/250
450/250
GPM
396
317
(L/h)
(89949)
(71959)
Yes
Yes
500/300
450/250
30
35
40
(17)
(19.5)
(22)
33
28
25
(7495)
(6424)
(5631)
Optional
Optional
Optional
120/80
120/80
120/80
30
35
40
(17)
(19.5)
(22)
66
57
50
(14991)
(12850)
(11244)
Yes
Yes
Yes
200/120
200/120
200/120
99
85
74
(22487)
(19275)
(16865)
Yes
Yes
Yes
250/150
250/150
200/120
132
113
99
(29983)
(25700)
(22487)
Yes
Yes
Yes
300/200
250/150
250/150
165
141.4
124
(37476)
(32122)
(28107)
Yes
Yes
Yes
300/200
300/200
300/200
198
170
148.5
(44974)
(38549)
(33731)
Yes
Yes
Yes
400/200
300/200
300/200
231
198
173
(52470)
(44974)
(39352)
Yes
Yes
Yes
400/200
400/200
300/200
264
226
198
(59966)
(51399)
(44974)
Yes
Yes
Yes
450/250
400/200
400/200
Viessmann
Low-loss
Temp.
Sensor
Required
Supplied
Viessmann
Low-loss
Temp.
Sensor
Required
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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