Heat exchanger for oil or gas burner heater has circular cavity wall with water-filled annular chamber and removable end-caps

摘要

A heat-exchanger for an oil- or gas-fired heater unit has a burner (2) surrounded by a cylindrical cavity wall (3) with inner (5) and outer (4) faces. The cavity between the walls is an annular chamber (6) with flowing water. The annular chamber end-faces are closed by caps (1, 9).