Appendix
69
Technical Data
(continued)
Standard heating boiler
Boiler Model
Model No.
WB1A 8-24
WB1A 8-30
Dimensions
Overall depth
Overall width
Overall height
inches
mm
inches
mm
inches
mm
13.4
340
15.7
400
27.6
700
13.4
340
15.7
400
27.6
700
Gas supply connection
NPTF
(female)“
¾
¾
Flue gas
*5
Temperature (at boiler re-
turn temperature of
86 ºF/30 ºC)
– at rated full load
– at rated partial load
Temperature (at boiler re-
turn temperature of 140
ºF/60 ºC)
ºF/ºC
ºF/ºC
ºF/ºC
127/53
90/32
167/75
131/55
90/32
172/78
Flue gas value
Mass flow rate (of flue
gas)
– at rated full load
– at rated partial load
Available draught
lbs/h
kg/h
lbs/h
kg/h
Pa
mbar
79.2
36.0
33.0
15.0
100
1.0
100.1
45.5
33.0
15.0
100
1.0
Average condensate
flow rate
*
6
with natural gas
– T
S
/T
R
=122/86ºF/50/30
ºC
USG/day
ltr/day
1.8-2.1
7-8
2.1-2.4
8-9
Condensate connec-
tion
*7
hose
nozzle
∅
in
1
1
Boiler flue gas connec-
tion
*8
∅
in/mm
2
3
/
8
/60
2
3
/
8
/60
Combustion air supply
connection
*8
outer
∅
in/mm
4/100
4/100
*5
Measured flue gas temperature with a combustion air temperature of 68 °F/20 °C.
*6
Based on typical boiler cycles, including partial load conditions.
*7
Requires 1”/25 mm tubing. See Vitodens 100-W Installation Instructions for details.
*8
For detailed information refer to the Vitodens Venting System Installation Instructions (PN 5285 268).
"
For information regarding other Viessmann System Technology componentry, please reference documentation of respective product.
5
5
8
1
7
7
5
1
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