Extensive experimentation with palladium wire cathodes electrolyzed in heavy water has identified loading, initiation and triggering criteria associated with the production of excess heat. In early experiments the loading and triggering were both achieved by electrochemical means and the initiation process was adventitious. This paper discusses the origins of these different effects and suggests means to optimally meet the different criteria for excess heat production as a step towards the attainment of experimental reproducibility.
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