Big freeze presents old problem for modern boilers | UK news | The Guardian: "The second extremely cold winter in a row has exposed what plumbers say is a flaw with condensing boilers, the only sort permitted to be installed since 2005 under government regulations. These are significantly more energy-efficient than traditional boilers because rather than expelling hot waste gases from a flue they use some of this energy to heat water.
However, this process condenses moisture in the gases. The waste liquid is usually expelled into the drains via a slim plastic pipe running down an external wall – a pipe which is prone to freezing in particularly cold weather, stalling the entire system."
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