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Old 03-15-18, 08:59 PM   #15
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Originally Posted by Semipro View Post
Heating time is a measure of performance (e.g. capability) not efficiency. I'd argue here that efficiency is energy in/versus energy out to accomplish a task.
Since the end goal is heating, and all the electrical input energy is converted into heat, and the system is essentially closed with respect to external heat loss, I challenge the assertion that scaling results in decreased efficiency.
The overall heat transfer coefficient of the system takes a hit with a scale build up The pdf I linked to earlier has a list of papers / books to back up the info.

Scale sucks more heat out faster and takes longer to put the energy in to accomplish the same temperature rise. A two fold hit then there's lifespan to add to the scales effects

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