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Table 1: U-values for a typical three bedroom apartment
Typical 3-bed flat, mid terrace, mid-floorÌýU-value (W/m2K)
Total floor area70 m2Ìý
Window area(aluminum frame, double glazed, low e)7 m22·6
External walls28 m20·35
Room height: 2·3 mÌý
41% of flat is living area (combined kitchen/dining/living area)ÌýÌý
Table 2: Comaprison of glazing to floor ratio and window u-values
U-value (W/m2K)% glazing to floor area
2·2 (elemental minimum U-value)16·5
2·4 (double glazing, low e, argon filled)15·1
2·6 (double glazing, low e)13·8
3·3 (double glazing, argon filled)10·7
3·4 (double glazing)10·4
1·8 (triple glazing, low e, argon filled)20·6
Assumes wall U-value of 0·35 W/m2K and electric heating.
Table 3: Comparison of the emissions of electric heating to gas based systems
ÌýOption 1Option 2Option 3
ÌýGas-fired condensing combi boilerElectric storage heaters, electric water heaters 140 litre storage, 2002 CO2 emissionsCommunity heating – gas-fired boiler
SAP12098120
Running cost (£)93.72135.9493.31
Carbon index9·67·49·1
CO2 kg/year86915651033