Yeah blue power is highly annoying in that regard. And it doesn't always talk "properly" to other redstone systems One of the benefits of Project Red over BP imo.
I can't recommend strongly enough that you test RS latches on the ground, away from your tank, using buttons to simulate the activated states.
I think I've got a plan in my mind, but let's see if I can implement it today. I have a vanilla Comparator at the tank valve with a line of redstone dust 15 long. Using repeaters, I'll pull the signal off this line at segments 3 and 12 (corresponding to 1/4 tank full and 3/4 tank full values). Then, using these as input signals, I'm gonna combine the outputs of a NOR gate and an AND gate into an RS Latch. I think this will turn the Boiler off at 3/4 full and turn it on at 1/4 full. I hope I can do it.
The BP stuff might not be the best, but it has one big plus - you can mount them anywhere, sideways or even upside down on the ceiling. Really helps me save some space, I hate big, messy crap, and I cannot hide it because I need to keep it close to the tank/boiler and need to keep it in the same chunk so it all works when I'm offline.
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