The hot flue gas produced in the combustion chamber passes through the first coils before the metal disc and exits to the outer casing realizing the high temperature heat exchange; the flue gas passes through the baffle and passes through the last coils, realizing the low temperature heat exchange that preheats the incoming water through the condensation of the exhaust.
Condensate, produced by the high decrease in flue gas temperature, drains from the bottom of Circond, on the opposite side flue gas exits from the top.
The metal disc separates the combustion chamber from the condensing part, and the position of the disc is variable: this distinctive feature ensures optimized condensation heat exchange for each specific power size.
This particular property affects both the flue gas pressure drop and the amount of condensate produced, consequently the efficiency of the Heat Exchanger.