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Indirect DHW tank Delta T?
In a primary/secondary boiler system a Taco 0010 is serving a Slant Fin WH-40 D indirect DHW tank. The Boiler is Trinity TFT 110(99,000 DOE). The manual for the WH-40 D says that is has 8 feet of head at 6 gpm and will give a 65 deg Delta T at 115 deg. Total head for the DHW loop is about 8.4 feet. At 8.4' of head the 0010 should move about 11 gpm. This is no doubt lowering the Delta T dramatically.
So here's the questions; what is the effect of a lower Delta T on the DHW Tank? How will if affect the 1st hour rating and how will it affect efficiency?