12
4.0 Technical Data
© Baxi Heating UK Ltd 2007
4.3 System 28 HE
Flue Terminal Diameter 100mm
Dimensions Projection 125mm
Outercase Dimensions
Casing Height - 780mm
Overall Height Inc Flue
Elbow - 965mm
Casing Width - 450mm
Casing Depth - 345mm
Clearances
Above Casing 200 mm Min
Below Casing 200 mm Min
Front 450 mm Min (For Servicing)
Front 5 mm Min (In Operation)
L.H. Side 5mm Min
R.H. Side 5mm Min (In Operation)
20mm Min (See Note*)
*NOTE: The boiler can be operated with a
clearance of 5mm at the right. This is also
sufficient for routine maintenance. However a
clearance of 20mm is required if it is necessary to
remove the secondary heat exchanger. This
should be considered when siting the appliance
and in the event of any subsequent alterations in
the area of installation
Weights kg
Packaged Boiler Carton 51
Installation Lift Weight 40.5
Central Heating Primary Circuit
Pressures
bar
Safety Discharge 3
Max Operating 2.5
Min Operating 0.5
Recommend Operating 1-2
Pump
Available Head See graph below
Expansion Vessel - (For Central Heating
only. Integral with appliance)
bar
Min Pre-charge Pressure 0.5
litre
Max Capacity of
CH System 125
Primary Water Content
of Boiler (unpressurised) 1.2
Connections copper tails
Gas Supply - 22mm
Central Heating Flow - 22mm
Central Heating Return - 22mm
Pressure Relief Discharge - 15mm
Temperatures
Flow Temp (adjustable)
35°C to 85°C max (± 5°C)
Heat Input
Max Min
kW 28.9 11.9
Electrical Supply 230V~ 50H
z
(Appliance must be connected to an
earthed supply)
Power Consumption 180W
External Fuse Rating 3A
Internal Fuse Rating
Fuse 2A Fast Blow to BS 4265
Appliance Category CAT II
2H 3P
Max Gas Rate (Natural Gas - G20)
(After 10 Mins)
m
3
/h 3.06
Inlet Pressure (Natural Gas - G20)
mbar 20
Burner Injector (Natural Gas - G20)
15 x 1.25mm Diameter
Burner Pressure (Natural Gas - G20)
Max Rate Min Rate
mbar 10.9 ± 0.5 2.1 ± 0.5
Appliance Type C
12
C
32
C
52
NO
x
Class 3
Electrical Protection
IPX5D
Heat Output (Non-Condensing)
Max Min
kW 28 11
Heat Output (Condensing)
Max Min
kW 29.3 11.3
Condensate Drain 1” BSP
This 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 0051.
SEDBUK Declaration For System 28 HE
The seasonal efficiency (SEDBUK) is 87.3% (87.2% LPG)
Band B
LPG Propane - G31
Burner Injector 0.77mm diameter
Burner Pressure
Propane mbar
Inlet Pressure
mbar
Max Rate
29.4 ± 0.5
Min Rate
5.2 ± 0.2
37
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