3
British Gas 100 & 125 RD2 -
Installation & Servicing
GENERAL
Boiler Size
100
125
Gas Supply Connection
in. BSP
Rc 1/2 (1/2)
Number of Boiler Sections
4
5
Flow and Return Connections
Rc 1 (1" BSP)
MAXIMUM Static Water Head
m (ft.)
30.5 (100)
(3 bar)
MINIMUM Static Water Head
m (ft.)
1.0 (3.3)
Electrical Supply
(Power Consumption)
230 V ~ 50 Hz (150 W)
Fuse Rating
External 3 A
Internal 2A to BS4265
Water Content
litre (gal.)
9.8 (2.1)
12.2 (2.7)
Dry Weight
kg. (lb.)
113 (249)
136 (300)
Boiler Size
Height
mm (in.)
850 (33.5)
Width
mm (in.)
440 (17.4)
Depth
mm (in.)
533 (21.0)
600 (23.6)
Gas Type
Natural 2 H
Gas Supply Pressure
20 mb
Flue duct diameter
mm (in.)
100 (4.0)
Flue duct length (max)
m (ft)
2 (6.5)
1 (3.25)
Table 1 - General Data
CAUTION. To avoid the possibility of injury during the installation, servicing or cleaning of
this appliance, care should be taken when handling edges of sheet steel components.
Boiler Size
100
125
Boiler Input
Nett CV
kW (Btu/h)
33.0 (112 600)
41.3 (141 000)
Gross CV
kW (Btu/h)
36.6 (125 000)
45.8 (156 300)
Gas Consumption
l/s (ft.
3
/h)
0.95 (120.4)
1.18 (150.5)
Boiler Output to Water
kW (Btu/h)
29.3 (100 000)
36.6(125 000)
Burner Setting Pressure (hot)
mbar (in w.g.)
11.5 (4.6)
13.2 (5.3)
Seasonal Effiiciency (SEDBUK)*
Band[ ]%
D[77.6]%
D[77.9]%
Table 2 - Performance Data
Note.
Gas consumption is calculated using a calorific value of 38.7
MJ/m
3
(1038 Btu/ft
3
) gross or 34.9 MJ/m
3
(935 Btu/ft
3
) nett. To
obtain the gas consumption at a different calorific value:-
a.
For l/s - divide the gross heat input (kW) by the gross C.V.
of the gas (MJ/m
3
)
b.
For ft
3
/h - divide the gross heat input (Btu/h) by the gross
C.V. of the gas (Btu/ft
3
)
c.
The appliance is preset at the factory to the nominal rating.
Key to symbols
GB
= United Kingdom (Countries of destination)
PMS
= Maximum operating pressure of water
C
12
= A room sealed appliance designed for connection via
ducts to a horizontal terminal which admits fresh air to
the burner and discharges the products of combustion
to the outside through orifices which, in this case, are
concentric. The fan is down stream of the combustion
chamber.
I
2H
= An appliance designed for use on 2nd Family gas,
Group H only.
*
The value is used in the UK Government's Standard Assessment Procedure (SAP) for energy rating of dwellings.
The test data from which it has been calculated have been certified by BG plc 0087.
