Frozen boiler condensate pipes can be a frequent occurrence for UK homeowners during the icy winter months. Ideally, you should have the condensate pipe thawed-out by an engineer, but if that’s not convenient then here are some easy guidelines to remedy the problem yourself.
What is the Boiler Condensate Pipe?
Most modern boilers have a condensate pipe which transports water away from the boiler. To improve efficiency, the boiler removes as much energy from the flue gases as possible and some of this waste gas cools and turns into a small amount of acidic water. The pipe transports this steady dribble of water away from the boiler and into a drain.
To check if your boiler has a condensate pipe, look at the pipes underneath the boiler entering and exiting the unit itself. If one of these pipes is plastic (usually white and around 20mm wide) and the rest are metal then you almost certainly have a condense pipe. Track the pipe to the outside of your home and you’ll find the pipe always runs to a drain so the water can be eradicated.
Why Does it Freeze?
Because the pipe runs outside the home in order to reach an existing or its own drainage point, during the cold winter months the acidic water is prone to freeze. When it freezes in the pipe it creates a block so water fills up inside the boiler. A trigger is switched to shut down the boiler when it reaches a certain point to prevent the water flooding the entire system.
Can I Prevent it from Freezing?
Yes, there are a number of products on the market that will prevent the condensate pipe from freezing.
BoilerTrace is a universal trace heating kit designed for use on boiler condensate pipes. The cable can be installed on the inside or outside of the pipe and has been specifically designed for use on all condensate boilers. With RCD protection provided you can be assured that your installation is both up to 17th Edition wiring regulations as well as providing an efficient way of frost protecting your boiler condensate line. View and buy the BoilerTrace on Amazon.
The Heating & Hotwater Industry Council (HHIC) advise operating the boiler at a higher flow temperature during the winter to reduce the amount of condensate forming, which will lower the chances of the condensate pipe freezing. This does mean that the radiators around your home will be hotter and your energy bills will rise so remember to turn the temperature on the thermostat down when the cold spell has passed.
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