Just over 13% of the UK homes are referred to as being ‘off-gas grid’ and are not connected to the national gas supply network. There is the option of connecting to the gas grid but depending on the distance involved this can be very costly. The electric boiler has always had a mixed reputation. Burning fossil fuels has been the staple for heating homes across the world for millennia. However, increased pressure on homeowners to reduce carbon emissions has seen a shift to renewable sources of energy and an investment in improving energy efficiency.