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