Engines of similar ( or even identical ) configuration and operation may use a supply of heat from other sources such as nuclear, solar, geothermal or exothermic reactions not involving combustion ; but are not then strictly classed as external combustion engines, but as external thermal engines.

Engines of similar ( or even identical ) configuration and operation may use a supply of heat from other sources such as nuclear, solar, geothermal or exothermic reactions not involving combustion ; but are not then strictly classed as external combustion engines, but as external thermal engines.

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