This European Standard defines requirements and test methods concerning, in particular, the construction safety as well as classification and marking of non-domestic flueless space heaters (including greenhouse heaters and diffusive catalytic combustion heaters), having a nominal heat input not exceeding 10 kW (Hs) burning 3rd family gases at nominal operating pressure not exceeding 50 mbar. It covers the following types of appliance: a) Fixed heaters; b) Portable or mobile heaters including those that incorporate a compartment for a transportable refillable liquefied petroleum gas cylinder; c) Heaters intended for use in non domestic areas; d) Heaters inte