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heating flow slow to heat radiators?

have vaillant ecotecpro it takes a long time for radiators to heat up can be as long as1 to/2 hours.
recently have pressed chimney sweep mode and it seems to speed up the heat process. is this oh are is it dangerous?
roger kelly, March 2014
Look like flue is not right ,reposition flue avoid 90 degree make it 45 by 45 need to inspect by gas safe engineer

ltd, March 2014
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