I'm using a couple identical as those for my auto top off and have been in service for over 4 yrs with no problems and they are exposed to a salty environment. They get fairly warm when they are cycled on so you have to watch where you mount them.
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Mike
150g reef, 55g sump, T5's, Vertech 200A, Profilux III - German made is highly over rated, should just say Gerpan made.
Reefkeeper - individual obsessed with placing disturbing amounts of electricity and seawater in close proximity for the purpose of maintaining live coral reef organisms.
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