Charnwood Flue Boilers fit Charnwood stoves and are available by SPECIAL ORDER . They can be used to heat hot water or heat radiators . This means that you can heat your hot water or other rooms in your home while running your stove in winter. The boilers come in three sizes (to fit our stoves). This means an output range of between 1.8KW (max) and 3.4KW (max) depending on which size you choose. Your average electric heating element in a 200 litre geyser is a 4KW element. This means that if your electrical element takes 1 hour to heat your water in your geyser, then our boilers will heat your hot water over a period of between 1 hour 10 mins and 2 hours 10 mins. All of this means less electricity dependency!