It also occurred to me that if they did not put any check valves in the system and the flow rate is too small to activate the pump you could be pulling cold water in a back flow through the pump and thus diluting your hot water to the dish washer. This is just one more reason I do not like recirculating hot water system. You may notice that hot water pressure or flow seems to be less than the cold water and this is not uncommon. What this does do is result in a drop in pressure between the hot and the cold water lines, almost guaranteeing cross communication of cold to hot if the pump is not running. You might also try turning on the hot water at the sink with a very small flow and see just how much you need to open the hot water valve before you activate the pump.
The hot water line runs about 27" inside the cabinet (temp average 60) - maybe another 24" to cross the back of the DW, and come up underneath where it connects. Just tested… a 1/2" pipe x 24" long - holds slightly less than 4oz. So, even if the line was 4' long and 1/2" in diameter, it wouldn't hold over 8 oz. Doesn't seem like that's enough to dilute the hot water coming in that much. I'll have to do some more testing with this theory.
Evidently dishwashers do not note how much water goes in - just fills to a point that activates the control panel……my water level is to the correct notch so it's getting plenty of water. GE says the profile uses 5gal a cycle — but doesn't specify which cycle. I purchased this because it has the best reviews of all the new ones, even beating out much more expensive models - though you can't call these cheap :)
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Posted by: Dale Schoepflin <dalu@hbcomm.net>
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