His instrumented tests assure you a maximum efficiency for your boiler and fuel type. Users have reported savings of one to two cleanings per season. The average installation takes one to four hours. In most cases there's no downtime or loss of heat or steam pressure. Insulating cooler gases are in contact with tube walls.
Hotter gases rise and flow mainly through the top tubes.
Excessive heat, lost up the stack, shows up as a high stack - gas temperature. Lower stack temperatures prove the boiler is using the fuel more efficiently to make hot water or steam.