By replacing the old, inefficient boiler with a brand new, A-rated boiler you could reduce your gas bills by up to £300 per year. Think of it like this - If your current boiler is 65% efficient, this means that for every £1 you spend on your heating, 35p is being wasted. By comparison, modern A-rated boilers are 90% more efficient. This means that a new boiler will have wastage of less than 10p for every £1 you spend. If you receive the required combination of benefits, you could have your old gas boiler replaced via the ECO Boiler Grant Scheme and start saving on bills.