High-Efficiency Combination Boilers


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Description A combi boiler is a high efficiency boiler and heater, contained within a compact unit and does not include a water tank.
Advantages
  • Space saving
  • Reliable design
  • High energy efficiency
Disadvantages
  • Certain conditions may result in low water pressure
Characteristic features
Application barriers
Information sources Source Source Source
Image
Trade:
Parameter Minimal Value Maximal Value Unit
Fuel

Gas

Operating Efficiency

91.1

91.1

Annual Degradation Rate in Efficiency

9

%

Heat Output Central Heating

30

30

kW

Heat Output DHW

39

39

kW

Output Capacity

39

39

kW

Dimensions

86x72

181x72

inches

Weight

330

840

kg

Maximum DHW Flow Rate

37

37

kW

Maximum DHW Flow Rate Required

3

3

kW

Minimum Operating DHW Pressure Required

30

150

psi

Mechanical and Hydraulic Connections

Boiler feedwater pump, Boiler connection kit

CH Flow/Return Pipe Size

10,2

139,7

DHW Flow/Inlet/PRV Size

20

50

mm

Noise Level

45

45

dB

CO Emissions Maximum

40

40

mn/m3

NOX Emissions Maximum

0,02

0,02

ppm

Investment Cost

500

2500

£

Operational Cost

666

666

£

Replacement Cost

500

2500

£

Life Expectancy

5

5

years

Deterioration Description
Causes
Parameter
Degradation Rate
Measurement


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