all submersible heaters sold in Canada will have a "do not submerse in water" some where on them as according to our electrical standards there is nothing that qualifies to be a submersible heater. so yes they are submersible depending on which ones they are, and yes you should always unplug them when doing a water change. so you are both right.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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