Water tank pumps are quite efficient and don’t use much power to operate.
Example 1 – water pump for all household water requirements
For example, sample measurements from a pump operating for the Surrey Hills house supplying all water needs in August 2008 were:
| Hours | 297 |
| Days | 12.375 |
| kWh | 2.8646 |
| kWh/h | 0.009645118 |
| kWh/day | 0.231482828 |
Example 2 – water pump trial for garden watering
This trial was conducted with a water pump used to water a garden, also in Surrey Hills, Victoria. The pump was run for 20 minutes, the volume pumped and the electric energy used were both measured.
| Volume pumped – litres | 608 |
| Energy used – kWh | 0.35 |
| Water usage per day (2 person household) – litres | 122 |
| kWh/day | 0.070 |