Why is the ph of my hot water 2 points higher than my cold water?
Water testing is affected by temperature so if they tested the water hot and did not adjust for the temp the measurement was off. When I worked in a clean room the water was tested at 72 degrees if the temp was +- a couple of degrees we had to adjust the values so that is probably the reason for such a high level. But I think it went down on hot measurements, the only thing in your tank that could affect the PH is the anode , flushing the tank and or replacing the rod would be all that you can do.