Powerful and eco friendly central heating boilers from 500 and 900 Series are capable of producing 16 kW outputs to water for radiators and domestic hot water. The 500 Series has a built-in cooking hob, while the 900 Series model features a larger cooktop and a 58 litre oven for baking and roasting. Practical, economical and efficient, these boilers provide long burn time, and are easy to use and maintain. An integrated temperature sensor controls the air supply during the heating phase and beyond, while special heating valve regulates air supply ensuring optimum air intake. Wamsler.