I am trying to determine the best easiest method to use to heat my domestic hot water from my thermal storage. Since I am not willing to add a demestic coil in my tank I have pretty much decided to use a flat plate exchanger with 2 circulator pumps to heat my water controlled by an auquastat located on my existing electric hot water tank. Open to more options or details. My current idea is to pull cold water from the bottom of the tank and pass it through the plate exchanger then inject the hot water into the port where the blow-off valve is located. I think the best place to put my auqastat is on top where the water leaves the hot water tank. My questions... 1. Can I use the internal thermostat that is on the electric tank?(I do not want to comprimise the electric functionality) 2. If not where is the best place to locate the auquastat? 3. Best injection points givin the lack of ports? 4.Locate the plate exchanger closer to the storage or domestic tank? 5.Any other thoughts or better ideas?