Natural gas heater

The utility model belongs to the technical field of heaters, and particularly relates to a natural gas heater which comprises a heater shell, a burner cover is arranged at the top of the heater shell, a sealing mechanism is arranged on the surface of the burner cover, a gas inlet channel is formed in the burner cover, and a gas inlet pipe is fixed on one side of the burner cover. The main gas pipe is arranged in the heater shell and communicated with the gas pipeline through the gas inlet pipe, the first valve is manually adjusted to control the discharge amount, ignition combustion supporting is carried out through the mother fire gun, then combustion heating is carried out at the fire spraying opening, air is discharged through the air inlet to adjust the flame size, and then the interior of the protection pipe is conveniently heated; according to the mode, the temperature difference change of the molten aluminum heating temperature is small, oxidizing slag is small, energy conservation and heat preservatio