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Heat load and heat demand of buildings

Heat demand and heat load are a decisive factor in the design of energy systems. In the nPro tool, individual demand parameters are stored for each building type and each location.

Heating load and heat demands for different building types

The heat demand and the heat load of a building are two of the most important parameters in the design of district energy systems. On this page, you find the heat load and heat demand for a variety of different building types as an example for the location Berlin, Germany. The data should only be used as initial estimates if no other building-specific data is available. Information on the size and nature of the building also plays a role in more accurate estimates of heat demand. In addition, demand data is site-specific: in northern Europe, the heat demand of a school is higher than in southern Europe. In nPro, estimates of heat demand and heating load are stored for all available locations and all building types.

Table 1: Typical heating load and heat demand for different building types: The values given are estimates for average existing buildings; the values in parentheses are estimates for new construction.
Building typeHeat demandHeat load
School120 (60) kWh/m²109 (60) W/m²
Kindergarten140 (70) kWh/m²127 (70) W/m²
Office125 (65) kWh/m²89 (59) W/m²
Hospital165 (85) kWh/m²92 (57) W/m²
Canteen170 (75) kWh/m²126 (65) W/m²
Restaurant170 (75) kWh/m²97 (65) W/m²
Hotel150 (85) kWh/m²100 (77) W/m²
Museum115 (65) kWh/m²61 (46) W/m²
Theater160 (75) kWh/m²84 (54) W/m²
Car park0 kWh/m²0 W/m²
Shopping center85 (65) kWh/m²57 (59) W/m²
Retail95 (65) kWh/m²56 (54) W/m²
Supermarket115 (75) kWh/m²77 (75) W/m²
Sport hall140 (85) kWh/m²64 (61) W/m²
Gym125 (75) kWh/m²69 (63) W/m²
Public swimming pool175 (125) kWh/m²80 (78) W/m²
Table 2: Typical heat load and heat demand for single-family houses
Year of constructionHeat demandHeat load
Before 1918250 kWh/m²119 W/m²
1919 - 1948194 kWh/m²97 W/m²
1949 - 1957223 kWh/m²117 W/m²
1958 - 1968198 kWh/m²104 W/m²
1969 - 1978182 kWh/m²96 W/m²
1979 - 1983160 kWh/m²84 W/m²
1984 - 1994135 kWh/m²71 W/m²
1995 - 2001101 kWh/m²53 W/m²
After 200272 kWh/m²45 W/m²
KfW 8561 kWh/m²38 W/m²
KfW 7051 kWh/m²32 W/m²
KfW 5541 kWh/m²29 W/m²
KfW 4031 kWh/m²22 W/m²
Passive house21 kWh/m²15 W/m²
Table 3: Typical heat load and heat demand for multi-family houses
Year of constructionHeat demandHeat load
Before 1918180 kWh/m²90 W/m²
1919 - 1948193 kWh/m²102 W/m²
1949 - 1957211 kWh/m²117 W/m²
1958 - 1968168 kWh/m²93 W/m²
1969 - 1978139 kWh/m²77 W/m²
1979 - 1983124 kWh/m²69 W/m²
1984 - 1994116 kWh/m²64 W/m²
1995 - 200198 kWh/m²54 W/m²
After 200265 kWh/m²43 W/m²
KfW 8555 kWh/m²37 W/m²
KfW 7045 kWh/m²30 W/m²
KfW 5535 kWh/m²27 W/m²
KfW 4025 kWh/m²19 W/m²
Passive house15 kWh/m²12 W/m²
Table 4: Typical heat load and heat demand for apartment blocks
Year of constructionHeat demandHeat load
Before 1918159 kWh/m²80 W/m²
1919 - 1948164 kWh/m²86 W/m²
1949 - 1957173 kWh/m²96 W/m²
1958 - 1968172 kWh/m²96 W/m²
1969 - 1978140 kWh/m²78 W/m²
1979 - 1983116 kWh/m²64 W/m²
1984 - 199482 kWh/m²46 W/m²
1995 - 200173 kWh/m²41 W/m²
After 200254 kWh/m²36 W/m²
KfW 8548 kWh/m²32 W/m²
KfW 7038 kWh/m²25 W/m²
KfW 5528 kWh/m²22 W/m²
KfW 4020 kWh/m²15 W/m²
Passive house12 kWh/m²9 W/m²