| 11. | The Class 362 / 363 engines had an electrically-controlled preheater and heat retention system.
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| 12. | The " Rothemuhle " regenerator is used as an air preheater in some power generating plants.
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| 13. | The preheater was located in front of the chimney and lay parallel to the axis of the locomotive.
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| 14. | It is also equipped with an engine preheater, to allow the engine to start in severe cold.
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| 15. | At a cost of ?0m, the kiln is 68m long and the preheater tower is around 80m high.
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| 16. | This can choke the preheater to the point that air-flow can no longer be maintained in the kiln.
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| 17. | This technology has been extensively used in industrial furnaces and powerplants where it is known as an air preheater or APH.
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| 18. | The system feeds both units terminating on the air preheater roof where the main boiler feeds are controlled through a gas header.
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| 19. | For example, no feedwater preheater was fitted to start with for weight-saving reasons, but one was later installed.
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| 20. | As was typical on all " Einheitslokomotiven ", the engine had a Knorr feedwater preheater mounted transversely above the smokebox.
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