For those interested in a semi-solution to help prevent this failure you can set your ATO to not always be active and use a timer to control when it can activate. This is easily done within level sensor settings. Set the timer to activate once a day for just slightly longer than it would need to for worst case evaporation. This essentially replaces the max on time so you set that to 0 to deactivate or still use it how you see fit. For example you could set max on time to your evaporation limit of say 5min while setting the timer to activate for 5-1/2 min. This way you still get an alarm and deactivation if you want it. Otherwise you you can deactivate the max on time and set timer to activate for 5min. The advantage here if you do have a float failure and you're away from home top off water will still be added daily at a rate just slightly over the needed amount but will likely take several days before an issue would surface. While if the alarm feature is used your top off remains deactivated until reset which could also cause issues depending how long it goes unnoticed and how long your tank can run without top off supply.
With either approach the tank will be protected against the fluke occurrence of constant power outages during float failure.
Of course you can also limit the amount of fresh water supply available which most people do but for those people who use a large supply to hold the tank over for an extended or infinite period of time this feature should prove useful.
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