Homeowners can now get a free energy rating for their boiler when it’s next serviced, and free advice on cutting fuel bills.
The government initiative is part of a wider drive to help consumers make their homes more environmentally efficient.
The Heating and Hot Water Industry Council estimates there are still around 4 million old, inefficient boilers used in homes.
The government says most people don’t know that the average boiler rating is only an E, out of a range of A to G, with A being the most energy efficient.
Ministers say that improving a boiler’s efficiency could cut fuel bills by hundreds of pounds and reduce carbon emissions.
People will be offered other advice on cutting fuel bills. For example, a family could save nearly £100 a year by getting a 75 millimetre water cylinder jacket, installing heating controls and insulating their hot water pipes.
Longer term measures such as changing from a low G-rated boiler to an A-rated one could save over £200 a year and cut up to 2.7 tonnes of carbon from a household’s carbon footprint.
Roger Webb, director of the Heating and Hot Water Industry Council, said: ‘This new scheme will be a useful tool in highlighting to householders the importance of replacing their boiler with the most efficient models.
‘Consumer safety would also be improved if householders were encouraged to replace their boiler as most incidents of CO poisoning are caused by old, poorly maintained appliances.’