Boiler for oil or gas burner, etc.

摘要

The boiler (10) has a return (RL) and advance (VL) for a heating medium. A burner (12) burns the fuel in a furnace (14) so that it heats the medium in a heat exchanger (20) and creates a heating gas (A) vector (1). Further vectors (2,3) lead on from the first to also heat the heat exchanger. These vectors pass through U-shaped tubes (22) in the exchanger. The tubes are preferably round. The plane through the tubes is preferably vertical.