Solar water heating systems use free heat from the sun to warm domestic hot water.
A conventional boiler or immersion heater can be used to make the water hotter, or to provide hot water when solar energy is unavailable.
The benefits of solar water heating:
A large portion of the energy your solar panels produce will be exported back to the grid.
In standby mode 90% of the electricity you generate could be exported.
It is assumed that you export 50% of what you generate and this is what you are paid for by your energy supplier at around 5 pence per unit regardless of how much energy is actually exported.
Your energy supplier will then sell it back to you at a much higher rate (typically 12 pence per unit) when you require more energy than you are generating.
It makes sense therefore to harness this energy, prevent it from going back to the grid and use it yourself.
Battery storage enables you store your excess generation for you to use later when your consumption is higher than your generation.