How to test the flue air intake on a gas central heating boiler. Boiler Service.
Elliott from E Fry Gas Services shows us a leaking Vaillant Combi Boiler.
How to test if the flue is dangerous.
LEEDS PLUMBER - Shocking Boiler Installation and New Boiler    • LEEDS PLUMBER - Shocking Boiler Insta...  
ACS GAS TRAINING