I asked the same question a couple months ago and while most people responded Tunze everyone else just said what they currently had was the best. So I went a different direction and started googling what systems have failed and why. I couldn't find any instances were a Tunze ATO caused any damage or overflows. Lots of pumps dying but usually due to owner not filling up the water. Other systems had more problems but I'll leave you to research any particular methods you are interested in.
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