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gurggling boiler?

how doi stop my boiler from gurggling i have unfrozen the condensation pipe
ray, November 2010
The condensation trap can get choked with grit (a by-product of the products of combustion). Is it full to the brim? It should only have 'some' condensate in it.

CMac, November 2010
What boiler is it...

Gary, November 2010