Viessmann WB2B 45 - Page 56

Additional Information
56
Technical Data
Table 4
Boiler Model Model No. WB2B 45 60
Natural gas / liquid propane gas
CSA input
CSA output/DOE
*1
heating capacity
MBH
kW
MBH
kW
60-160
17-47
55-146
16-43
60-212
17-62
55-194
16-57
Net I=B=R rating
*2
MBH 127 169
Heat exchanger surface area ft.
2
m
2
15.76
1.46
15.76
1.46
Min. gas supply pressure
Natural gas
Liquid propane gas
“w.c.
“w.c.
4
10
4
10
Max. gas supply pressure
*3
Natural gas
Liquid propane gas
“w.c.
“w.c.
14
14
14
14
A.F.U.E. % 96.1 96.1
Weight lbs
kg
155
70
155
70
Boiler water content USG
ltr
1.9
7.2
1.9
7.2
Boiler max. flow rate
*4
GPM
ltr/h
15.4
3500
15.4
3500
Max. operating pressure
at 210ºF / 99ºC
psig
bar
60
4
60
4
Boiler water temperature
– Adjustable high limit (AHL)
range
space heating
(steady state)
DHW production
– Fixed high limit (FHL)
ºF/
ºC
ºF/
ºC
ºF/ºC
68 to 165 /
20 to 74
165 /
74
210/99
Boiler connections
Boiler heating supply and return NPTM “
Pressure relief valve NPTF “
Drain valve (male
thread)
Boiler supply/return for
indirect-fired DHW storage tank NPT”
(field supplied)
Gas valve connection, NPTF
1¼
¾
¾
1¼
1
1¼
¾
¾
1¼
1
*1
Output based on 140ºF / 60ºC, 120ºF / 49ºC system supply/return temperature.
*2
Net I=B=R rating based on piping and pick-up allowance of 1.15.
*3
If the gas supply pressure exceeds the maximum gas supply pressure value, a separate gas pressure regulator must be installed upstream of the
heating system.
*4
See “Typical System Flow Rates” on page 28 in this manual.
5418 909 v1.6