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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
Application barriers
Information sources	Source Source Source
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Trade:

Fuel	Gas
Operating Efficiency	91.1%
Annual Degradation Rate in Efficiency	<9%
Heat Output Central Heating	30 kW
Heat Output DHW	39 kW
Dimensions	86x72 inches, 181x72 inches
Weight	330-840 kg
Maximum DHW Flow Rate	37 kW
Maximum DHW Flow Rate Required	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 dB
CO Emissions Maximum	40mn/m3
NOX Emissions Maximum	0,02ppm
Investment Cost	£500 - £2,500 in UK
Operational Cost	£666 Average Bill
Replacement Cost	£500 - £2,500 in UK
Life Expectancy	5 years (taken as warranty)

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The Design4Energy project aims to address evolutionary life-cycle evolutionary design methodology able to create energy-efficient buildings flexibly connected with the neighbourhood energy system.

BL(Ti)=0.788

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Boiler 4