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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			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

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