DS EN 15502-2-1:2012 Gas-Fired Central Heating Boilers - Part 2-1: Specific Standard For Type C Appliances And Type B2, B3 And B5 Appliances Of A Nominal Heat Input Not Exceeding 1000 Kw Defines the requirements and test methods concerning, in particular, the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of gas-fired c