The following table shows the estimated consumption of electricity by the heat pump for each month in 2011 in units (kW.hours). There are separate columns for Domestic Hot Water (DHW) and Central Heating (CH). The overall cost is based on a price of 13.17p per unit which was the price at the end of the year. This should be compared with the estimated cost of using oil of £2087, i.e. nearly halved.
| Month | DHW | CH | Total |
| January | 217 | 1694 | 1911 |
| February | 168 | 1446 | 1614 |
| March | 155 | 1050 | 1205 |
| April | 120 | 135 | 255 |
| May | 93 | 0 | 93 |
| June | 90 | 0 | 90 |
| July | 93 | 0 | 93 |
| August | 93 | 0 | 93 |
| September | 120 | 0 | 120 |
| October | 155 | 114 | 269 |
| November | 180 | 739 | 919 |
| December | 217 | 1485 | 1702 |
| Totals | 1701 | 6663 | 8364 |
| Cost | £224.02 | £877.52 | £1101.54 |
The same for 2012
| Month | DHW | CH | Total |
| January | 217 | 1526 | 1743 |
| February | 174 | 1656 | 1830 |
| March | 155 | 710 | 865 |
| April | 120 | 489 | 609 |
| May | 93 | 0 | 93 |
| June | 90 | 0 | 90 |
| July | 93 | 0 | 93 |
| August | 93 | 0 | 93 |
| September | 120 | 0 | 120 |
| October | 155 | 114 | 269 |
| November | 180 | 739 | 919 |
| December | 217 | 1485 | 1702 |
| Totals | 1701 | 6663 | 8364 |
| Cost | £224.02 | £877.52 | £1101.54 |