CLHS oil (gas) hot water boiler is a vertical oil (gas) internal combustion fire tube boiler. The high-temperature flue gas generated by the combustion of the burner flushes the furnace and the threaded smoke pipe with spiral spoilers inserted in it from the bottom, and then is discharged into the atmosphere through the chimney from the upper smoke chamber. The boiler is equipped with an industrial burner with good technical performance, and adopts advanced technologies such as automatic combustion ratio adjustment, automatic water supply adjustment, program start and stop, and full-automatic operation. Since the boiler is pressure-free during operation, it can be installed anywhere without being restricted by the multi-level annual inspection procedures. This safe, reliable and explosion-proof hot water boiler has been rapidly developed and promoted in recent years. This product is suitable for heating (using temperature 95°C) and boiling water (using temperature 100°C) in various fields.