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one issue would be heat, internal transfer their heat to the water, external typically to the air. thus it will bump your temp up a bit in the summer, but heat your tank the rest of the year. not really an issue if you have AC.
 

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One advantage to having the pump inside the sump is if there's any leak in the hose connection to the pump, you don't end up with a flood. In fact you won't even realize it is leaking.

I had a set-up at one point with an external UV, a cheap made-in-China knock-off brand. My hose connections were all good, but after 2 years the UV unit itself developed a slow leak. Fortunately it didn't happen while I was away, and I caught it before I had a flood.
 

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One advantage to having the pump inside the sump is if there's any leak in the hose connection to the pump, you don't end up with a flood. In fact you won't even realize it is leaking.

I had a set-up at one point with an external UV, a cheap made-in-China knock-off brand. My hose connections were all good, but after 2 years the UV unit itself developed a slow leak. Fortunately it didn't happen while I was away, and I caught it before I had a flood.
After what you said... if i ever build a sump, it's definitely inside!
 
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