Diverter

A solar diverter is a device through which any solar power not being used in your home is diverted to an immersion heater in your hot water. If you are generating 1500w of power while only using 500w around the home instead of 1000w going back to the grid it will divert this power to your immersion heating providing you with free hot water.

This can be installed at the same time as your Solar PV System and would benefit from Zero VAT.