Power Outage With Canister Filters

I want to get a canister filter. I have my mind set on an Eheim 2213 or 2215 classic. My main concern is that if the power goes out, will canister filters siphon out my tank and drain the water onto the floor? If so, how can I avoid this. And if they don't, what prevents it from happening?

 

I don't think that would happen in a normal power outage, but I will tell you that my seal on my filstar wasn't sealed properly, and we didn't notice until we had a power outage and we could still hear water dripping. I looked under my tank, and water was still dripping onto the floor even without power.

 

I don't think that would happen in a normal power outage, but I will tell you that my seal on my filstar wasn't sealed properly, and we didn't notice until we had a power outage and we could still hear water dripping.  I looked under my tank, and water was still dripping onto the floor even without power. 

Why couldn't you put in one of those one way valves that they use for air pumps? They only cost like 1 dolllar? ???

 

b/c the tubes are to big

 

I did heaps of research on Eheim Canisters before I went and bought mine and if you are worried that it will ever leak go for the Professional like I did because they've replaced the metal clips and othe litte things that could have broke with a much better designed easier to operate system etc. I didnt cost that much more than the Classic 2215.
They're all supposed to be brilliant however and I'm glad I spent the the money and went with the Eheim.