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Heating demand calculations
This is a rather more geeky section of the analysis which gives you an idea of the heating demand from the property as the different measures are installed. The calculations are also available in a spreadsheet in the appendix if you wish to look at the figures in more detail. You will need a full heat loss assessment from an installer before installing a heat pump.
Progressive heat loss calculations
2019 (SAP 10.1) tCO2
Current EPC
Predicted EPC
Current carbon
Predicted carbon
Current heating
Predicted heating costs
kWh/m²
Predicted kWh/m²
Heat loss coefficient
Heat pump size in KW
Remove secondary heaters - gas
69.95 C
71.78 C
3.759
3.494
£739.95
£696.12
94.77
93.5
326.1
8
Block open chimneys
69.95 C
72.41 C
3.759
3.426
£739.95
£684.86
94.77
91.21
316.7
8
Insulated floors (50mm) from 1967-1975 suspended timber floor
69.95 C
74.26 C
3.759
3.143
£739.95
£637.90
94.77
81.66
286.9
7
300mm loft insulation from 250mm
69.95 C
74.38 C
3.759
3.123
£739.95
£634.65
94.77
81
284.9
7
Humidity controlled kitchen extractor
69.95 C
74.38 C
3.759
3.123
£739.95
£634.65
94.77
81
284.9
7
Humidity controlled extractors per wetroom
69.95 C
74.38 C
3.759
3.123
£739.95
£634.65
94.77
81
284.9
7
Humidity controlled passive ventilation to non-wet rooms
69.95 C
74.38 C
3.759
3.123
£739.95
£634.65
94.77
81
284.9
7
Install PV system where potential has been identified
69.95 C
84.15 B
3.759
2.554
£739.95
£634.65
94.77
81
284.9
7
GSHP with existing radiator central heating and hot water, from A rated gas boiler #2
69.95 C
84.84 B
3.759
0.642
£739.95
£622.99
94.77
91.28
284.9
7
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