I have an Attack DP356 Profi to which I plan to connect an 800 gallon tank. This is a milk bulk storage tank I got for free, which looks like a small milk truck - the tank runs horizontally. It's about 5' tall and 8' long. I'd like to get the best stratification I can and would also like to make sure I size the FPHX properly. My thoughts for the tank are to install a supply and return header in the tank, return at 6" or so from the bottom and the supply about a foot or so from the top. These will be constructed of 1" CPVC. The headers will run horizontally end to end in the tank. Each header will have a series of 3/4" holes, the return at the bottom will have holes facing down, the supply at the top will have holes facing up. I am hoping this will reduce turbulence in the tank and promote stratification. For the FPHX, I plan to use a 700KBTUH model, to ensure I can achieve a fairly low approach temp and fully charge the tank. This will be connected at the boiler with 1" black iron and a Taco 3 speed circulator. At the tank side, there will be two Taco 007's, one for each direction, with 1" pex. Any thoughts on the manifold idea and FPHX size?