As parts of the UK prepare for the coldest winter weather in recent years, condensing boilers which produce water as a by product become more at risk of breaking down if temperatures remain at sub zero for a prolonged period of time. If the boiler stops and a gurgling noise is heard then a blocked condensate pipe may be a cause especially if the temperature is negative and the pipe goes to an external drain. The boiler buoy can give a simple indication that this is the problem and has a easy to operate tap to bypass the blockage and allow the boiler to restart.
By the end of this week temperatures are likely to fall and some regions will be negative by day. This is a possible repeat of the 2010 and 2011 winters when many households faced condensing boiler shut downs. Seven years on there are another 10 million condensing boilers installed and though regulations reduced the condensate freezing risk, external perpetual negative temperatures will stop boilers working.