10
4.0 Technical Data
© Baxi Heating UK Ltd 2013
0
200 400 600 800 1000 1200
0.5
1
1.5
2
2.5
3
3.5
4
Metre (wg)
Flow Rate (l/h)
Pump - Available Head
0
5
5.5
6
4.5
4.1
Flue Terminal Diameter 100mm
Dimensions Projection 125mm
Outercase Dimensions
Casing Height - 763mm
Overall Height Inc Flue Elbow - 923mm
Casing Width - 450mm
Casing Depth - 355mm
Weights
(24/28)
Packaged Boiler Carton 41.5kg
Installation Lift Weight 36kg
(33)
Packaged Boiler Carton 43.5kg
Installation Lift Weight 38kg
(40)
Packaged Boiler Carton 44.5kg
Installation Lift Weight 39kg
Central Heating Primary Circuit
Pressures
bar
Safety Discharge 3
Max Operating 2.5
Min Operating 0.5
Recommended Operating Range 1-2
DHW Circuit bar
Pressures
Max Operating 8
Min Operating 0.15
Flow Rates (24) (28) (33) (40)
l/min l/min l/min l/min
DHW Flow Rate
@ 30
o
C Rise 10.9 12.9 15.3 18.3
DHW Flow Rate
@ 35
o
C Rise 9.8 11.5 13.5 16.4
Min Working
DHW Flow Rate 2 2 2 2
Pump
Available Head See graph below
Expansion Vessel - (For Central Heating only.
Integral with appliance)
bar
Min Pre-charge Pressure 0.5
(24 & 28) (33 & 40)
litre litre
Max Capacity of
CH System 125 155
Primary Water Content
of Boiler (unpressurised) 2.5 2.8
Connections copper tails
Gas Inlet - 22mm
Heating Flow - 22mm
Heating Return - 22mm
Cold Water Inlet - 15mm
Hot Water Outlet - 15mm
Pressure Relief Discharge - 15mm
Temperatures
C.H. Flow Temp (adjustable)
25°C to 80°C max (± 5°C)
D.H.W. Flow Temp (adjustable)
35°C to 60°C max (± 5°C)
dependent upon flow rate
NO
x
Class 5
Clearances
Above Casing 175 mm Min
Below Casing 150 mm* Min
Front 450 mm Min (For Servicing)
Front 5 mm Min (In Operation)
L.H. Side 5 mm Min
R.H. Side 5 mm Min
*This is MINIMUM recommended dimension. Greater
clearance will aid installation and maintenance.
Heat Input CH (Net) Max Min
24 model kW 20 3.5
28 model kW 24 3.9
33 model kW 28 4.8
40 model kW 32 5.9
Heat Output CH (Non-Condensing)
Max Min
24 model kW 20 3.4
28 model kW 24 3.8
33 model kW 28 4.7
40 model kW 32 5.7
Electrical Supply 230V~ 50H
z
(Appliance must be connected to an
earthed supply)
Electrical Protection
IPX5D
Internal Fuse Rating F2L
Appliance Category CAT I
2H 3P
Injector
24 model mm 4.4
28 model mm 4.6
33 model mm 4.9
40 model mm 5.8
Heat Output CH (Condensing)
Max Min
24 model kW 21.2 3.7
28 model kW 25.3 4.1
33 model kW 29.6 5.1
40 model kW 33.8 6.2
Heat Input DHW (Net) Max
24 model kW 24.7
28 model kW 28.9
33 model kW 34
40 model kW 41.2
Heat Output DHW Max
24 model kW 24
28 model kW 28
33 model kW 33
40 model kW 40
Condensate Drain
To accept 21.5mm (
3
/
4
in) plastic waste pipe
External Fuse Rating 3A
Power Consumption
24 model W 104
28 model W 116
33 model W 132
40 model W 142
Inlet Pressure (Natural Gas - G20)
mbar 20
Max Gas Rate (Natural Gas - G20)
(After 10 mins)
24 model m
3
/h 2.54
28 model m
3
/h 2.96
33 model m
3
/h 3.49
40 model m
3
/h 4.23
Inlet Pressure (Propane - G31)
mbar 37
NATURAL GAS ONLY !
PROPANE ONLY !
Max Gas Rate (Propane - G31)
(After 10 mins)
24 model kg/h 1.92
28 model kg/h 2.25
33 model kg/h 2.64
40 model kg/h 3.2
NOTE: All data in this section are nominal values
and subject to normal production tolerances.
IMPORTANT: Where Low Flow Taps or Fittings are
intended to be used in the DHW system connected it is
strongly recommended that the DHW flow rate DOES
NOT fall below 2.5l/min. This will ensure reliable
operation of the DHW function.
SAP 2005 Seasonal Efficiency for N. G.
models is 91.1%
SAP 2005 Seasonal Efficiency for L.P.G.
models is 93.2%
SAP 2009 Annual Efficiency for N. G.
models is 89%
SAP 2009 Annual Efficiency for L.P.G.
models is 91%
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
has been certified by 0087.
SEDBUK Declaration
Appliance Type C
13
C
33
C
43
C
53
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