The Rayburn Heatranger 680 KCD has the largest cast-iron hot plate on the market, two large ovens and a boiler which powers up to 16 radiators, as well as delivering copious amounts of domestic hot water. It has two independent burners - one for heating and hot water, the other for cooking. To encourage fuel efficiency and energy saving, the Rayburn 680 KCD has an Eco mode for the boiler to ensure it runs at its optimum efficiency of over 85%.