Bundle an iStore Solar Power System with an Award-Winning iStore Heat Pump iStore won the 2025 Product Review Award for the fifth year in a row for their renowned hot water heat pump. iStore – AIR TO ENERGY technology drastically reduces your electricity costs, especially when combined with a solar PV system, helping you make the most of your savings. Utilising thermal energy, the iStore heat pump stores the excess solar energy generated by your solar panels and converts it into hot water for your home. The iStore heat pump is one of the most efficient and affordable energy storage