G
gasmarc
very good Kirkgas LOL i have met similar, the FGA can solve alot of problems ,i do have to admit that i usually only use mine when doing a service and say to the customer if the efficiency is ok I will not break the combustion seal as it may need replacing hence the price maybe double the quoted price or worse I may have to cut them off. EG had a customer that wanted a service on an ariston he combi which i didnt like the look of ,well they had BG out as their gas bills were hugh and their hot water you could make tea with, this had been like this for years , the FGA went off the scale , the problem was the burner pressure was way out, sorted customer delighted