GCSE Physics

EPC Graphs

EPC: energy efficiency rating EPC: environmental impact (CO2) rating

The average Energy Efficiency Rating for a house in England and Wales is band E (rating 46), so the EPC above shows a good performance (72) with the potential to improve to 75 if a more efficient boiler was installed. The EPC goes on to suggest fitting solar thermal and solar electric panels, which would boost its performance to 76 and 87 respectively.

The average Environmental Impact (CO2) of a household is about 6 tonnes every year; for the house above, it was 3 tonnes. Clearly simple measures can make a real difference to energy bills and associated carbon emissions. Here are the key areas assessed in the EPC above with descriptions and current performance:

WallsCavity wall, filled cavityGoodGood
Roofs200mm loft insulation averageGoodGood
FloorsNo insulation assumed--
WindowsFully double glazedAverageAverage
HeatingGas boiler with radiatorsGoodGood
Heating ControlsProgrammer, room thermostat and TRVsAverageAverage
Hot WaterFrom central heating systemGoodGood
LightingLow energy lighting in all fixed outletsVery goodVery good

There is a strong correlation between the two ratings, for obvious reasons! But how could we improve on the above?

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