In message , Cod Roe
writes
geoff wrote:

Well, for a start, it depends on whether it is a positively or
negatively pressurised boiler (whether the fan blows or sucks)
Ecomax is IIRC neg so should be OK in that regard

The instruction manual says the boiler is room sealed, so how is the
presence of the cover relevant to this?

It isn't then, is it ?

--
geoff