I have a Hayward H350 with a knob controlled thermostat (as opposed to a digital thermostat). Yesterday I had the heater on with the knob set to about 1/3 of the way between Minimum and Maximum (what I thought was a relatively low setting). However, the pool had reached a temperature of 78 degrees and the heater was still running. My question is: does anybody know, approximately what different positions of the knob equate to in pool temperature? For example does Minimum = 70 degrees and Maximum = 90 degrees or something like that?