Boiler Efficiency ImprovementsThe boiler is inefficient compared to current standards. The calculation below quantifies the saving that could be made with a modern replacement.
| Estimated gas consumption for central heating and hot water | 12702kWh | | Estimated Pilot Light Gas Consumption | 1839kWh | | Gas consumption for Heating and Hot Water | 10863kWh | | Approximate Current Boiler Efficiency | 70% | | Heat Used on central heating and Hot Water | 10839 x 0.7 = 7587.3 | | Approximate Replacement Boiler Efficiency | 90% | | Fuel requirement with replacement boiler | 7587.3 / 0.9 = 8430.3 | | Fuel Saving | 10863 - 8430 + 1839 = 4272 | | With gas at 0.04p/kWh the annual cost saving would be | 4272 x 0.04 = £170.88 |
Use of Insulated Radiator Panels
| Location | Wall | Output | % Total Output | | Dining Room | Inside | 3109 | 26 | | Living Room | | 0 | 0 | | Kitchen | Inside | 1749 | 15 | | Reception | Outside | 1749 | 15 | | Toilet | Outside | 469 | 4 | | Front Bed (Main) | Outside | 1289 | 11 | | Front Bed (Small) | Outside | 932 | 8 | | Bathroom | Outside | 1554 | 13 | | Back Bed | Outside | 1140 | 10 | | TOTAL | | 11991
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Insulated panel manufacturers claim as high as 27% savings. However, for the project house a more modest 10% will be used.
| Percentage of radiator heat output on outside walls | 60% | | Annual Heat Energy used for central heating | 9188 kWh | | Heat dissipated through radiators on outside walls | 9188 x 0.6 = 5512.8 kWh | | Saving at 10% | 551 kWh | | With gas at 0.04p/kWh the annual cost saving would be | £22 |
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