Portable heater

1. A portable heater ( 100 ), comprising:

an air inlet ( 108 ) and an air outlet ( 118 );

a heating chamber ( 115 ) including one or more heating elements ( 230 ); and

a preheating chamber ( 114 ) located between the air inlet ( 108 ) and a heating chamber inlet ( 116 ), wherein at least a portion of the heating chamber ( 115 ) is positioned within the preheating chamber ( 114 ).

2. The portable heater ( 100 ) of claim 1 , further comprising one or more airflow generators ( 113 ) communicating with the air inlet ( 108 ) and the air outlet ( 118 ).

3. The portable heater ( 100 ) of claim 1 , further comprising an air filter ( 220 ) positioned proximate the air inlet ( 108 ).

4. The portable heater ( 100 ) of claim 1 , further comprising one or more temperature sensors ( 240 , 241 , 242 ).

5. The portable heater ( 100 ) of claim 1 , wherein the heating chamber inlet ( 116 ) faces away from the air inlet ( 108 ).

6. The portable heater ( 100 ) of claim 1 , further comprising a heating chamber inlet guard ( 117 ).

7. The portable heater ( 100 ) of claim 1 , further comprising an airflow path from the inlet ( 108 ), through the preheating chamber ( 114 ), through the heating chamber inlet ( 116 ), the heating chamber ( 115 ), to the outlet ( 118 ).

8. A portable heater ( 100 ), comprising:

a frame ( 101 ), including an air inlet ( 108 ) and an air outlet ( 118 );

a preheating chamber ( 114 );

a heating chamber ( 115 ), with at least a portion of the heating chamber ( 115 ) positioned within the preheating chamber ( 114 ); and

a heating chamber inlet ( 116 ) located such that air in the portable heater ( 100 ) flows through at least a portion of the preheating chamber ( 114 ) prior to entering the heating chamber inlet ( 116 ).

9. The portable heater ( 100 ) of claim 8 , further comprising one or more heating elements ( 230 ) in the heating chamber ( 115 ).

10. The portable heater ( 100 ) of claim 8 , further comprising one or more temperature sensors ( 240 , 241 , 242 ).

11. The portable heater ( 100 ) of claim 8 , further comprising a heating chamber inlet guard ( 117 ).

12. The portable heater ( 100 ) of claim 8 , further comprising one or more airflow generators ( 113 ) communicating with the air inlet ( 108 ) and the air outlet ( 118 ).

13. The portable heater ( 100 ) of claim 8 , wherein the heating chamber ( 115 ) is offset from the frame ( 101 ).

14. The portable heater ( 100 ) of claim 8 , further comprising an airflow path from the inlet ( 108 ), through the preheating chamber ( 114 ), through a heating chamber inlet ( 116 ), the heating chamber ( 115 ), to the outlet ( 118 ).

15. The portable heater ( 100 ) of claim 8 , further comprising an air filter ( 220 ) positioned proximate the air inlet ( 108 ).

16. A portable heater ( 100 ), comprising:

an air inlet ( 108 ) and an air outlet ( 118 );

a heating chamber ( 115 ) including one or more heating elements ( 230 ); and

a preheating chamber ( 114 ) located between the air inlet ( 108 ) and a heating chamber inlet ( 116 );

wherein the heating chamber inlet ( 116 ) faces away from the air inlet ( 108 ).

17. The portable heater ( 100 ) of claim 16 , further comprising one or more airflow generators ( 113 ) communicating with the air inlet ( 108 ) and the air outlet ( 118 ).

18. The portable heater ( 100 ) of claim 16 , further comprising one or more temperature sensors ( 240 , 241 , 242 ).

19. The portable heater ( 100 ) of claim 16 , further comprising a heating chamber inlet guard ( 117 ).

20. The portable heater ( 100 ) of claim 16 , further comprising an airflow path from the inlet ( 108 ), through the preheating chamber ( 114 ), through the heating chamber inlet ( 116 ), the heating chamber ( 115 ) to the outlet ( 118 ).