I usually come throughout boilers and installations where a condensate trap or its pipework is leaking.
This is particularly dangerous when it's leaking onto a fuel pipe for example.
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Alexandraa
If the effectivity of your boiler is dropping, it's time to schedule a service to search out and restore any problems.
During which, the engineer will be succesful of determine any faults, gas or water leaks, and ultimately make sure the boiler is working safely and effectively.