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Discussion Starter · #1 ·
I was referred to get an inline heater for my 55 gallon tank. So I will be getting the Hydor ETH In Line Heater.

Is it possible to get 2 x 100w heaters and place one on the intake and one on the out take?
This way if one fails it will be less likely to overheat the tank.

Or do I just get the one 200w heater?

Thanks
 

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As far as I know, the Hydor ETH comes in two models only - 200W and 300W. For a 55G, the 200W version would be ideal. These heaters go in the return line from the canister to the tank - presumably to limit their exposure to dirt. These are very reliable heaters. I've had mine for several years now, and so far no problem.
 

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I would go with the 300w.
 

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Discussion Starter · #6 ·
When buying the heater I have an option of buying the 1/2 inch or 5/8 inch fitting.

Which one do i choose?

I have the Fluval 304 and I'm not sure if I measure the inside diameter or the outside diameter of the hose.
 
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