On Sat, 19 Nov 2005 11:54:01 +0000, Ed Sirett
wrote:

I am now led to believe that system flushing appears to be a necessary
requirement for combis due to the design, how important is this
flushing, I would have thought any modern boiler should have some
filtering system to prevent fouling of the internals.


Complete cleaning of the existing pipes and radiators (by flushing or
otherwise) is essential.

I would have to agree that flushing could only benefit but how
essential is it; as previously mentioned my old gravity system worked
for years without any flushing.

The new combi failed within 16 months, I am not an engineer but would
have thought filters should protect vulnerable parts of a boiler.

Geoff Lane