In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
I have a NTI Tft 155 boiler that is set up for indirect DHW with a 67 gallon Lochinvar tank. It works fine and we always have hot water, but I wonder if I have the sola controller configuration parameters optimally configured to save gas. My bills have been the same as with the two older 40 gal gas water heaters plumbed in series, but based on the attached image and the fact that it only runs briefly when the tank needs to be reheated, I was wondering if I could tweak things to make it use less natgas by either having it modulate lower for DHW cycles or by adjusting the hysteresis parameters. Any advice for tweaking parameters for summertime DHW heating? Many thanks in advance.