1.) Yes, aquaero 6 works as a switched-mode power supply for the fan outputs which has a high efficiency and therefor does not cause much heat. The aquaero 5 on the other hand uses a classic voltage control which especially becomes quite warm/hot when connecting a lot of stuff and lowering the output voltage.
2.) The aquaero 6 can use voltage or PWM control on all four fan outputs. You can configure that in anyway you want. For example use output 1+4 with voltage control and 2+3 with PWM control. Each channel can have individual controller settings. Or in other words: whatever you want to do: it is possible.
3.) XT uses touch control, has four more buttons that make navigation a bit easier and can be programmed as short cuts to jump to specific menus point, the three main buttons are illuminated with LEDs, the display and touch buttons are covered by a glass so the whole front is even, the remote control is included and the runtime for free updates of the aquasuite software is 12 months longer.
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