inline heater very loud- normal?

[Magickiwi]

Stealth and heaters don't seem to go hand in hand do they? I would've liked to use a Hydor but the reviews I've read on them don't seem to be very favorable.

I bought an Aquatherm for my daughter's nano tank and it has the smallest footprint I've seen so far. Best of all they are relatively inexpensive and includes a controller.