I have a two year old 3 ton envision that I love. But I have a question because I have read that the system should produce more hot water in the summer than in the winter. In mine the reverse is true. On a hot day where my system runs 20 hours and we don't use hot water the temperture in my tank will get to about 105 where as on a cold day it would be about 125. Is this normal or can anyone tell me anything to check? Thanks for any help anyone can give.