Technical data

Additional Information
55
Technical Data
Table 4
Boiler Model Model No. WB2B 19 26 35
Natural gas / Liquid propane gas
CSA input
CSA output/DOE
*1
heating capacity
MBH
kW
MBH
kW
31-67
9-20
28-61
8-18
31-93
9-27
28-85
8-25
31-125
9-37
28-114
8-33
Net I=B=R rating
*2
MBH 53 74 99
Heat exchanger surface area ft.
2
m
2
10.23
0.95
10.23
0.95
10.23
0.95
Min. gas supply pressure
Natural gas
Liquid propane gas
“w.c.
“w.c.
4
10
4
10
4
10
Max. gas supply pressure
*3
Natural gas
Liquid propane gas
“w.c.
“w.c.
14
14
14
14
14
14
A.F.U.E. % 96.1 96.1 96.1
Weight lbs
kg
102
46
102
46
102
46
Boiler water content USG
ltr
0.87
3.3
0.87
3.3
0.87
3.3
Boiler max. flow rate
*4
GPM
ltr/h
6.2
1400
6.2
1400
6.2
1400
Max. operating pressure
at 210 ºF/99 ºC
psig
bar
45
3
45
3
45
3
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
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
*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.
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