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Old 10/26/2007, 11:28 PM
itZme itZme is offline
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Join Date: Sep 2005
Location: West Salem, OH
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I just wish the tubing I have in the sump was titanium instead of plastic tubing
I'm guessing it doesn't transfer heat very well.

Found this to answer your question about mixing hot/cold water.

"Membrane performance is based on feedwater temperature of 25°C. For every 1°C below 25°C product water quantity is reduced by 3%. When feedwater temperature is regularly below 25°C, it is recommended that hot and cold water are mixed to increase the temperature to 25°C. Feedwater which is greater than 35° will damage most membranes. "

Just guessing that the input water temp from the cold water supply line would hover around 50F in the winter means that 50F= 10C. 25C- 10C= 15C difference from optimal temp. 15C x 3% reduction in product water per degree = 45% reduction in output water
To me it seems that it may pay off to run some hot and some cold in your case.
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It doesn't make a difference what temperature a room is, it's always room temperature. ~ Steven Wright