Can I use the ProHeat 35 with both air-cooled and liquid-cooled systems?
Yes, the ProHeat 35 is designed to function as either an air-cooled or liquid-cooled system and automatically configures itself based on the type of extension cable attached. However, if using dual output cables, both must be of the same type (either both air-cooled or both liquid-cooled), and extension cables must be the same length. For single output, a protective plug must be placed on the unused connector. (Pages 17-18, 26)
From the official Miller ProHeat 35 Industrial Heater manual, page 26
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