2.6
PERFORMANCE DATA - Qudos 28s & Qudos 28sP
Seasonal Efficiency (SEDBUK) = 91.1 (Qudos 28s) & 92.9 (Qudos 28sP)
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 Advantica Technologies Ltd
Keston Boilers Ltd declare that there are no substances harmful to health within the
appliance or used during the production of the appliance.
The Qudos 28s is intended for domestic and commercial EMC environments and on a
governed G20 meter supply.
The Qudos 28sP is intended for domestic and commercial EMC environments and on a
governed G31 supply.
This boiler meets the requirements of SI 3083 The Boiler (Efficiency) Regulations and is therefore
deemed to meet the requirements of Directive 92/42/EEC. The CE mark on the appliance shows
compliance with Directives 90/396/EEC, 73/23/EEC and 89/336/EEC.
IMPORTANT
This product contains ceramic fibre boards, which although not regarded as a risk, contain
ceramic fibre which may cause temporary irritation to eyes, skin and respiratory tract. The
fibres are held in place by inorganic binders. Therefore as long as the boards are not
WD420/3/2007 Chapter 2 : General Instruction
The Keston Qudos 28s & Qudos 28sP
Boilers
Installation & Servicing Instructions
Page : 9
Qudos 28s
Qudos 28sP
Nat. Gas (G20)
LPG (G31)
Min. Input (Gross CV)
kW/(Btu/h)
7.8/(26,600)
7.6/(26,000)
Max. Input (Gross CV)
kW/(Btu/h)
29.4/(100,300)
28.8/(98,300)
Max. Output To Water
(80/60
o
C Flow/Return)
kW/(Btu/h)
26.4(90,500)
26.4/(90,500)
(50/30
o
C Flow/Return)
kW/(Btu/h)
28.4/(96,900)
28.4/(96,900)
Min. Output To Water
(80/60
o
C Flow/Return)
kW/(Btu/h)
7.0/(24,900)
7.0/(24,900)
(50/30
o
C Flow/Return)
kW/(Btu/h)
7.8/(26,600)
7.6/(26,000)
Max. Burner Press.-Hot
(Factory Preset)
mbar/(in w.g)
0/(0)
0/(0)
Max. Gas Cons. After 10 mins (DHW)
l/s / (Ft
3
/hr)
0.76/(96.6)
0.35/(45.0)
Max. Operating Flow Temp.
o
C
82
82
Max. Press. (Sealed System)
bar
2.50
2.50
Inlet Gas Pressure
mbar/(in w.g)
20.0 / (8.0)
37.0/(14.8)
Recommended Temp Diff.
o
C
8 to 20
8 to 20
Electrical Supply
230V 50Hz
230V 50Hz
Power Consumption (Max)
W
150
150
Power Consumption (Standby)
W
7
7
Type of Gas
G20 Natural Gas G31 LPG
Optimum Flue Gas CO
2
Level (at max CH rate, case on)
9.1
10.5
Expected CO/CO2 Ratio (at max CH rate, case on)
0.0007
0.001
Destination Countries
GB/IE
GB/IE
SEDBUK Efficiency
91.0
93.0
NOx Class
5
5
Safety Valve
bar / (lbf/sq in)
3 / (43.5)
3 / (43.5)
Expansion Vessel Capacity
litre
8
8
SEDBUK Rating
A (91.1%)
A (92.9%)
[NB: For larger systems an additional expansion vessel may be required]
Expansion Vessel Charge Pressure
bar / (lbf/sq in)
1.0 / (14.5)
Heating System Minimum Pressure
bar / (lbf/sq in)
0.6 / ( 8.7)
