Heater configured to operate with a first or second fuel

Abstract

A heater can be configured to operate with either a first fuel at a first pressure or a second fuel at a second pressure. In some embodiments, a pressure regulator unit is configured to regulate the pressure of either the first fuel or the second fuel and to direct either the first fuel or the second fuel towards a combustion chamber. A nozzle assembly can be configured to inject the fuel into the combustion chamber.

What is claimed is: 
     
         1 . An apparatus comprising:
 a nozzle for selectively dispensing a first gas, liquid, or combination thereof or a second gas, liquid, or combination thereof, the nozzle comprising:
 a first inlet; 
 a second inlet; 
 a first outlet configured to dispense the first gas, liquid, or combination thereof at a first pressure; 
 a second outlet configured to dispense the second gas, liquid or combination thereof at a second pressure; 
 a first cavity in fluid communication with the first inlet and the first outlet; and 
 a second cavity in fluid communication with the second inlet and the second outlet, the second cavity at least partially within the first cavity, 
   wherein the first inlet defines a first inlet area and the first outlet defines a first outlet area, wherein the first inlet area is larger than the first outlet area,   wherein the second inlet defines a second inlet area and the second outlet defines a second outlet area, wherein the second inlet area is larger than the second outlet area, and   wherein, in a first operating mode, the first gas, liquid, or combination thereof enters the nozzle through the first inlet and proceeds through the first outlet to exit the nozzle, and in a second operating mode, the second gas, liquid, or combination thereof enters the nozzle through the second inlet and proceeds through the second outlet to exit the nozzle.