im in the process of getting quotes for a new combi boiler ive had two so far one from a local firm and the other british gas. the boiler is worcester greenstar 28i junior condensing combi. The local firm have given two quotes one to site it in the garage where the existing one is and the other to have it in the airing cupboard upstairs, which they recommend. the engineer from BG only quoted to have it in the garage saying its a bad idea to use the airing cupboard as the drainage would be poor. who is right? the property is 15 years old 4 bed with 12 rads 1 bathroom 1 ensuite. thanks