Internal
Heat loss
The heat loss card with sample data, rendered outside the auth wall so the caveat treatment can be reviewed.
Heat Loss
How quickly your home loses heat, calculated using the Home Energy Model — the methodology replacing SAP for official energy assessments.
Heat transfer coefficient
284
watts per degree
Heat loss parameter
3.14
per square metre
Peak heating need
6.5 kW
at -2°C outside
Where the heat goes
Through walls, roof, floor and windows70%
Through junctions and cold bridges11%
Through draughts and ventilation19%
| Element | Area | U-value | Heat loss |
|---|---|---|---|
| External walls | 96 m² | 1.60 | 154 W/K |
| Roof | 45 m² | 0.40 | 18 W/K |
| Windows | 14 m² | 4.80 | 67 W/K |
| Ground floor | 45 m² | 0.70 | 32 W/K |
Indicative only
Several key values were assumed from your property's age and type. Adding your EPC or more survey detail will sharpen this considerably.
2 things we had to assume — see the working for what and why.