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How to defrost a frozen condensate boiler pipe

a frozen condensate pipe is very common, however, can be avoided without having an engineer call and high costly bills.

Here are some pointers to help you defrost your condensate pipe:

  • Pour hot water (not boiling water) over the end of the pipe where it’s frozen.
  • If you have a hot water bottle or any form of heat cushion you can wrap this around the pipe.
  • Reset the boiler holding the reset button once the pipe has defrosted.  If you’re unsure how to reset your boiler, check your manual or contact your boiler manufacturer who should be able to advise over the phone.

Thawing your condensate pipe.

  • Use hot water – not boiling – heated by a kettle or a microwave and pour over the end of the pipe where it is frozen using a suitable container like a watering can.
  • Hold a hot water bottle or heat wrap around the condensate pipe.
  • Once the pipe has thawed you should re-set your boiler by holding in the re-set button for 10 seconds and wait for the boiler to re-fire.

You can also find some useful information from the Baxi site via this link.


  • Never attempt to thaw a condensate pipe above waist level, or disconnect the condensate pipe in order to do so.
  • Never attempt to access the condensate pipe or any other pipe work within the boiler.
  • Beware of ice on the ground that will form from the water you have poured.

This information was given to you with the help and support of WDH Care


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