I have just had a Worcester Bosch Greenstar 40CDI delivered.
The installation manual states it should be mounted on a non-flammable surface.
I don't however, have a wall in the loft and I will have to build some sort of insulated cupboard to mount it in. Clearly the back of the cupboard to which the boiler is mounted has to be made out of some non-flammable substance, but what should it be?
Mr F.