With the smart immersion customers save on their oil/gas as well as their electricity.
The iboost is fitted as standard if you have a hot water tank. Any excess energy is diverted to your tank. In the summer months this essentially guarantees you hot water at no charge. In the winter months the smart immersion can help bring your tank to a luke warm temperature. This means it reduces the costly energy consumption of bringing your hot water to the required temperature. Customers tend to save around 25% on their oil/gas over the year with this clever add on.