[Chester Stone]

I serviced my Aqua-Hot yesterday, put in a new burner nozzel, fuel filter and adjusted the electrodes. Checked the mixer valve, and found that it gradually moved about 2/3 of a turn, but leaked water when my hand was on the knob. I ordered a new one from Roger. Found that the hose to the reserve tank was broken at the radiator cap and the unit was two gallons low even thought the reserve was full. Question: any suggestion on how to adjust the mixer valve after the burner is installed.