Burner Collars

Most heater manufacturers do not worry about the excess temperatures that occur near the burner end of a heater.  To prevent coils from seeing excess radiant and convective heat, TFS utilizes a refractory collar prevents the upper coils from exposure to high temperatures.  This is crucial not only to the longevity of your coils, but to your fluid.  Excess temperatures can cause coking and ultimately tube failure if heat is trapped in this region of the heater. 

The combination of TFS 3-Pass coil design, properly

designed exhaust stack and blower, create a natural draft

effect that forces combustion air freely through the heater.