[Alex Blair (RIP)]

Hi Vic...
Glad to help..
Being a licenced gas fitter and Refrigeration mechanic since 1967 ,gas heating is a speciality with me..
The condensating flue gasses are very acidic and are especially hard on copper tubing..Will eat it up in no time..
Possibly a heavy flat steel plate welded over the burner with a free flowin flue to out side will radiate more heat and allow you to have a place for the tea kettle for that all important cuppa char..
Cheers
Alex