Patent ID: 7607426

Claim:
A dual fuel heater for coupling with one of two fuel sources operating at different pressures, the heater comprising: a first fuel line; a second fuel line; a first pressure regulator valve configured to control flow of a first fuel through the first pressure regulator valve within a predetermined first pressure range corresponding to natural gas; a second pressure regulator valve configured to control flow of a second fuel through the second pressure regulator valve within a predetermined second pressure range different from the first pressure range and corresponding to liquid propane; and a fluid flow controller in communication with the first pressure regulator valve and the second pressure regulator valve, the controller configured to selectively permit flow of said first fuel to either the first fuel line or flow of said second fuel to the second fuel line; and a combustion chamber; wherein the first fuel line is in communication with a first oxygen depletion sensor nozzle and the second fuel line is in communication with a second oxygen depletion sensor nozzle.