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Posted by Peter on January 31, 2007 at 08:41:14:
In Reply to: Re: Grundfos Comfort Series Instant Hot Water System posted by HeatPro on January 30, 2007 at 15:28:10:
: Any heated water wasted is a cost; but any cold tap that is turned on purges the line fast. There are but a few pints in a cold water line. It's the time spent in getting the hot water that is to be decided if the cost of recirculation is worth the cost and comfort.
while i agree that the loss of hot water wastes more energy, I'm not sure i understand why there would be less cold water in a line that stretches to the same farthest tap as the hot.
i think your statement, "The thermostat starts the circulator when the line gets cool and stops the circulator when it is luke-warm." also would mean that the cold line used as a return could then be warmer all the way back to its source. is this not the case?
this would mean that if i wanted truly cold water, then i would have to purge the cold line of the recirculated warm water. i guess i could shut the system off in the summer or i wouldn't be able to get any real cold water?