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boiler flue?

Hi I have noticed that my flue on boiler does not relese the white steam that other flues do any ideas why
denise, December 2011
Does that mean I need a new boiler I have carbon monoxide detector in house and it has never went of is this problem repairable thanx

denise, December 2011
may be your boiler is not condensing new boiler are, less CO2

ltd, December 2011