Keston Boilers

Tel: (+44) 020 8462 0262

Email: info@keston.co.uk
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support information

C40 and c55

The section below details the performance data for the Celsius 25 condensing boiler. Further down the page are links to exploded diagrams to help identify spare parts.

Technical Specification

C40

C40P

Max. Input (GCV)

k/W/(Btu/h)
45.6/(155,600)
43.2/(147,00)
Max. Output to Water
(80/60C Flow/Return)
k/W/(Btu/h)
40.3/(137,700)
39.1/(133,300)
Max. Output to Water
(50/30C Flow/Return)
k/W/(Btu/h)
44.9/(153,400)
43.1/(147,100)
Min. Output to Water
(80/60C Flow/Return)
k/W/(Btu/h)
11.3/(38,500)
10.9/(37,300)
Required Inlet Gas Pressure (Dynamic)

mbar/(in w.g)

20.0/(8.0)
31.0/(12.4)
Max Gas Consumption After 10 Mins.

l/s / (ft³/hr)
1.207/(153.4)
0.452/(57.4)
Max. Operating Flow Temp.

°C
82.0
82.0
Max. Head (Open Systems)

m/(ft)
30.5/(10)
30.5/(10)
Max. Press. (Sealed Systems)
Bar
2.70
2.70
Min. Head (Open Systems)

m
3.0
3.0
Flow/Return Temperature Differential

°C
10 to 20
10 to 20
Electrical Supply

 

230V 50Hz
230V 50Hz
Power Consumption (Standby)
W
8
8
Power Consumption (Max)

W
260
260
IP Rating
IP20
IP20
Cabinet Height

mm
720
720
Cabinet Width

mm
520
520
Cabinet Depth

mm
320
320
Side Clearance
mm 
25
25
Base Clearance
mm 
150
150
Front Clarence (when servicing)
 mm
305
305
Top Clearance
mm 
150
150
Weight - Full
kg/(lbs)
65/(143)
65/(143)
Weight - Empty
kg/(lbs)
56/(123)
56/(123)
Flow and Return Connections
 
Rp 1" F
Rp 1 " F
Gas Connection
 
Rp 0.75" F
Rp 0.75" F
Condensate Connection
 
22mm plastic
Flue/Air Intake Pipe Size (nominal bore)
mm/(in)
50(2) or 75(3)
50(2) or 75(3)
Flue/Air Intake Material 50mm
muPVC (BS5255)
Flue/Air Intake Material 75mm
 
Keston Composite
Max. Air Intake length 50mm
m
 15
15 
Max. Flue Outlet Length 50mm
m
15
15
Max. Air Intake length 75mm
m
45
45 
Max. Flue Outlet Length 75mm
m
45
45
Type of Gas
 
G20 Natural Gas
G31 LPG  
Optimum Flue Gas CO2 Level
%
8.3
9.9
SEDBUK Efficiency
Band / %
A / 90.4
A / 92.5

 

Technical Specification

C55

C55P
Max. Input (GCV)
k/W/(Btu/h)
56.5/(192,850)
51.4/(175,400)
Max. Output to Water
(80/60C Flow/Return)
k/W/(Btu/h)
49.7/(169,500)
46.2/(157,600)
Max. Output to Water
(50/30C Flow/Return)
k/W/(Btu/h)
55.2/(188,500)
51.3/(175,000)
Min. Output to Water
(80/60C Flow/Return)
k/W/(Btu/h)
13.9/(47,500)
13.9/(47,500)
Required Inlet Gas Pressure
(Dynamic)
mbar/(in w.g)
20.0/(8.0)
31.0/(12.4)
Max Gas Consumption After 10 Mins.
l/s / (ft³/hr)
1.496/(190.1)
0.537/(68.3)
Max. Operating Flow Temp.
°C
82.0
82.0
Max. Head (Open Systems)
m/(ft)
30.5/(10)
30.5/(10)
Max. Press. (Sealed Systems)
Bar
2.70
2.70
Min. Head (Open Systems)
m
3.0
3.0
Flow/Return Temperature Differential
°C
10 to 20
10 to 20
Electrical Supply
230V 50Hz
230V 50Hz
Power Consumption (Standby)
W
8
8
Power Consumption (Max)
W
260
260
IP Rating
IP20
IP20
Cabinet Height
mm
720
720
Cabinet Width
mm
520
520
Cabinet Depth
mm
320
320
Side Clearance
mm 
25
25
Base Clearance
mm 
150
150
Front Clarence (when servicing)
 mm
305
305
Top Clearance
mm 
150
150
Weight - Full
kg/(lbs)
65/(143)
65/(143)
Weight - Empty
kg/(lbs)
56/(123)
56/(123)
Flow and Return Connections
 
Rp 1" F
Rp 1 " F
Gas Connection
 
Rp 0.75" F
Rp 0.75" F
Condensate Connection
 
22mm plastic
Flue/Air Intake Pipe Size (nominal bore)
mm/(in)
50/(2) or 75/(3)
50/(2) or 75/(3)
Flue/Air Intake Material 50mm
muPVC (BS5255)
Flue/Air Intake Material 75mm
 
Keston Composit
Max. Air Intake length 50mm
m
 15
15 
Max. Flue Outlet Length 50mm
m
15
15
Max. Air Intake length 75mm
m
45
45 
Max. Flue Outlet Length 75mm
m
45
45
Type of Gas
 
G20 Natural Gas
G31 LPG  
Optimum Flue Gas CO2 Level
%
8.8
10.2
SEDBUK Efficiency
Band / %
A / 90.2
A / 92.2

 

  
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KESTON Boilers Limited, 34 West Common Road, Hayes, Bromley, Kent BR2 7BX, United Kingdom, Telephone: 020 8462 0262 Fax: 020 8462 4459 General Information: info@keston.co.uk
Designed and built by PRG.