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Great thanks for your help. Its because the boiler is old I need to work on default values, balance flue and fanned flu have different default efficiency values

Hi, Im doing a building energy rating on a building and need to find if a boiler has a fanned flue or not. will it allways be displayed or is there any easy way of telling. The boiler in question is a Baxi Solo WM 30/4 RS. GC no is 41 077 047 Any help appreciated