How much can I save?
This depends on what you're using to heat your pool, swim spa or spa bath and where you are located. The table below gives the heat energy collected per (1.1m2) collector across an entire swimming season and the equivalent cost of this heat energy obtained using either gas, electric heat element or heat pump units.
Energy savings per collector across a swimming season
| Average Daily Seasonal Insolation (1.1m²) | Energy Collected | Gas (1kWh=3.6 MJ) | Electric Element Offset | Heat Pump Offset | |
| Melbourne (Oct-Mar) | 6.7 kWh | 733 kWh | $91 | $165 | $41 |
| Sydney (Oct-Apr) | 6.5 kWh | 696 kWh | $86 | $157 | $39 |
| Brisbane (Oct-Apr) | 6.7 kWh | 716 kWh | $89 | $161 | $40 |
Assumptions
- We assume the Vertex system is optimally mount and undersized so that each collector is maximally utilized.
- We count only the energy collected across the swimming season specifed.
- The Average Daily Insolations (or peak sun hours) across the swimming seasons are assumed to be 6.08kWh/m² (Melbourne), 5.94kWh/m² (Sydney) and 5.91kWh/m² (Brisbane).
- We assume an average gas price of 2.75c/MJ and electricity price of 22.5c/kWh.
- We assume an overall unglazed collector conversion efficiency of 60%, gas boiler efficiency of 80%, and heat pump efficiency of 300%.
To obtained the anticipated energy savings simply multiply the size of your system by the relevant energy cost - hence for a 4 panel spa heating system in Syndey, off-setting an electric heat element the anticipated annual savings are $157 × 4 = $628.