3 Technical specifications
13
Tab.4
In IE the following Code of Practice apply:
Standard
Scope
IS 813
Domestic Gas Installations.
The following standards give valuable additional information:
BS 5546
Installation of hot water supplies for domestic purposes.
BS EN
12828
Heating systems in buildings.
BS EN
12831
Heating systems in buildings — Calculation of load.
BS EN
14336
Installation & commissioning of water based heating sys
tems.
BS 7074
Expansion vessels and ancillary equipment for sealed wa
ter systems.
BS 7593
Treatment of water in domestic hot water central heating
systems.
Cogeneration space heater
No
No
3.2
Technical data
Tab.5
Technical settings for combination heaters with boilers
Baxi - Combi (C)
224 Combi 2
228 Combi 2
Condensing boiler
Yes
Yes
Low-temperature boiler
(1)
No
No
B1 boiler
No
No
3.2.1
Technical information
Important
All data in these sections are nominal and subject to normal pro
duction tolerances.
Combination heater
Yes
Yes
Rated heat output
Prated
kW
20
20
Useful heat output at rated heat output and
high temperature setting
(2)
P4
kW
20
20
Useful heat output at 30% of rated heat out
put and low temperature setting
(1)
P1
kW
Seasonal space heating energy efficiency
ƞs
%
Useful efficiency at rated heat output and high
temperature setting
(2)
ƞ4
%
Useful efficiency at 30% of rated heat output
and low temperature setting
(1)
ƞ1
%
6.7
93
88.2
97.9
6.7
93
88
97.8
BS 7074
Expansion vessels and ancillary equipment for sealed wa
ter systems.
BS 7593
Treatment of water in domestic hot water central heating
systems.
BS 4814
Specification for Expansion Vessels using an internal dia
phragm, for sealed hot water systems.
IGE/UP/
7/1998
Guide for gas installations in timber framed housing.
Standard
Scope
Combi 2
