Multi-family house - Case Study This factsheet shows the potential of optimised technical building systems for multi-family houses1. Multi-family houses cover a floor area of approximately 7.9 billion square meters within Europe. Reference Multi-family house Floor area: 3,811 m² View Southeast Final energy consumption: 156 kWh/m²a Heating Hot water Ventilation Cooling Gas condensing boiler by heating system (with circulation system) Natural ventilation - Technical building system Heating Hot water Ventilation Cooling Get the basics right Energy savings High performance Energy savings 31% 47% 20% 20% - - - - Total [%] Total [kWh/m²a] 28% 45 40% 63 The following table illustrates energy and energy cost savings as well as the required investment and payback period for the case study (building level). Optimisation package Final energy savings [%] Energy cost savings* [Euro] Investment [Euro] Payback period [years] Get the basics right 28% 10,330 14,110 1.5 High performance 40% 14,660 63,840 4.5 * EU28 energy cost averages from 2017 to 2030 as used in EPBD impact assessment (Gas: 5.9 ct/kWh; District heat: 9.6 ct/kWh; Electricity: 21.9 ct/kWh) 1 In the underlying study of this factsheet three multi-family buildings only differing in the type of heat generators (gas boiler, district heating, heat pump) have been investigated. The savings resulting from optimising the technical buildings system are mainly independent from the heat generator. This factsheet shows the multi-family house with gas boiler as heat generator.
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