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Ebo Jager. The best I know of. I have two old style Ebos way more than 20 years old, solid green glass. I use them as backups, for temporary tanks, etc. They still work perfectly, accurate to within one degree F. I've never had one go bad or become inaccurate, stick on, etc., not ever. I use Ebo Jagers in multiples in the sumps of my larger aquariums, set a couple of degrees lower than the controllers that regulate them. I would not consider using any other heater.
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