You probably know I sell all of those. Here is my thinking about them. There is no technical issue with using them with a low-NOX heater. But unless you have a water softener, sacrificial anodes make more sense. They’re cheap, have nothing to break, last a long time — especially if you can install two together, and don’t require electricity to function. I’m actually surprised you’re getting pink water unless you waited too long on the last changeout. My own heater is now 37 years old and going strong. If you install one of my hexes and one of my combos, it gives you the equivalent of 21 years of rust protection. There is no way yet to know if any powered anode will last that long.