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The overflow I'm looking at is not suppose to lose siphone
Yeah, a lot of them have been marketed that way over the years but I haven't seen one that truely lives up to that claim. Maybe this is the one : )
The most common issues are related to quick power outages and how they handle that. If the siphon breaks the return pump will empty the sump into the tank which can flood onto the floor. Depending on the sump size and design this might not be an issue and just burning out the return pump is the only real concern. This is much less significant than other issues.
Certainly, doesn't happen to everyone. Probably largely related t0 selecting the one which the most people have had success with, proper maintenance and frequency of short term power outages in your area.
Again I would look at your system and how it would behave in a situation like that as well as the potential damage to your home. If a flood just results in a mess on the tile no big deal. If you have to buy $5,000+ in new hardwood floors I would put a significant amount of thought into doing it as safely as possible.
I will say that draining most of the water out of the tank and drilling it for a proper overflow is a lot easier than most people think. Maybe a two hour project from end to end.
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