This European Standard specifies the requirements and test methods for the construction, safety, marking and rational use of energy of gas-fired insets for heating more than one room that are intended to be built into a casing made from brickwork or similar material.This European Standard is intended to be used in conjunction with EN 613:2000.This European Standard is applicable to type B11BS insets burning gas:that incorporate an atmospheric burner;that are installed directly to an open flue or to a device to evacuate the products of combustion;that have a nominal heat input not exceeding 20 kW (based on the net calorific value).In addition, this European Standard is also applicable to insets for heating more than one room which have a live fuel effect.This European Standard is not applicable to:open fronted appliances as specified in EN 13278;decorative fuel effect appliances as specified in EN 509;convection heating appliances as specified in EN 613;catalytic combustion appliances;appliances in which the supply of combustion air and/or evacuation of products of combustion is achieved by mechanical means as specified in EN 1266;warm air heaters (which are subject of CEN/TC 180).This European Standard is only applicable to insets which are intended to be type tested.