Valve assemblies for heating devices

1. A valve assembly for a dual fuel heater comprising:

a housing defining an oxygen depletion sensor (ODS) inlet and a burner inlet;

a valve body positioned within the housing and configured to rotate between a first position for a first fuel type and a second position for a second fuel type different from the first fuel type, the valve body comprising:

a single ODS channel in the valve body;

a first burner channel in the valve body; and

a second burner channel in the valve body;

wherein the valve assembly is configured such that rotation of the valve body between the first position and the second position changes the relationship of the single ODS channel to the ODS inlet and also changes the relationship of the first and second burner channels to the burner inlet;

a first burner nozzle member connected to the housing; and

a second burner nozzle member, wherein the second burner nozzle member is internal to the valve assembly.

2. The valve assembly of claim 1 , wherein an outlet of the first burner nozzle member is larger than an outlet of the second burner nozzle member.

3. The valve assembly of claim 1 , wherein the first burner channel is in fluid communication with the second burner channel.

4. The valve assembly of claim 1 , wherein one of the first and second burner channels passes through the valve body.

5. The valve assembly of claim 1 , wherein the single ODS channel comprises a slot in the valve body.

6. The valve assembly of claim 1 , wherein the first burner nozzle member is threadedly attached to the housing.

7. The valve assembly of claim 6 , wherein the second burner nozzle member is threadedly attached to the housing.

8. The valve assembly of claim 1 , wherein the second burner nozzle member is inside the first burner nozzle member.

9. A dual fuel heater comprising the valve assembly of claim 1 , a pressure regulator, a burner and an ODS.