News | Published on 29th Mar 2018
This can only be achieved when the flue gas temperatures are reduced to around 50c, (prior to this legislation the flue gases leaving a boiler were around 130c minimum). Cooling to this level creates water, known as ‘condensate’ which needs to be dispersed to the waste water drainage system or a soakaway.
An efficient condensing boiler will generate around 2 litres of condensate water an hour at a temperature of around 30-40°c. This needs to be safely disposed of, within the buildings waste water system. Industry specification and current British Standard 6798 states that ‘wherever possible, the condensate drainage pipe shall be terminated at an internal foul water discharge point’.
However, there are circumstances in which there is no other option than to run the pipe externally. In this instance the pipe needs to be increased to at least a 30mm inside diameter and insulated, or supporting solutions such as internal insulation or trace heating products should be fitted to help prevent freezing.
During the peak of the extreme weather experienced earlier in 2018 that caused major disruption across the UK as a whole, the UK’s gas emergency number control room took over 40,000 calls from members of the public – the vast majority were not boiler fail emergencies but people seeking help because their gas boiler had stopped working due to their condensate pipe becoming frozen.
From the feedback, we have received, it has become clear that there was a significant proportion of installations that were not installed to current standards and manufacturer’s instructions. That said, we are acutely aware that in extreme weather conditions external pipework carrying water is at risk of freezing, particularly when there is a high wind chill factor. Obviously it is difficult to legislate against the most extreme weather conditions. However, we believe it is time for the government to act.
Industry will now;
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