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solar tank sensor placement
What would be the optimum placement for the tank sensor in a solar system?. If it is up top, the system will shut down too soon with the water at the bottom staying cold. But with the sensor nearer the bottom, The circulator will com on in the evening when cold street water enters the tank and it seems some of the days gain will be pumped back to the panels and actually loose temperature. My system is an older Grumman Sunstream, wall mounted HX with 2 pumps. The controller has a set differential (4 deg) with no option to shut the system down when the panels/glycol drop below a user set temperatures. A 30 year system that continues to work perfectly. Except for possibly dumping heat back out under certain conditions. Thanks for any thoughts. Mark S