boiler, its like 50 years old (possible exageration), but the damn thing keeps going and going and going, its costing a absolute fortune, does anyone know what would possibly eventually cause its demise, its run on gravity and out of the ark, im in a block of 11 flats and 7 of 11 have lovely wall mounted boilers, i got this hideous monstrosity taking up loads of floor space, its only good side is, i can basically use the top as a extra bit of workspace...