Enter your room size in the boxes specified and then click the “Calculate” button. This gives an approximate output for use as an initial guide in selecting an appliance based on an outside temperature of -1°C. However we strongly recommend that a site survey is undertaken by an experienced stove installer before you make your purchase. 

Appliances are selected with an output slightly greater than the requirement to allow for more rapid heating in colder weather. Figures are based on approximate heating requirements shown in the HETAS® Guide to Solid Fuel Products and Services.