der_wille_zur_macht
Team RC
The 12v Koralias need a variable-frequency AC drive, not just variable-voltage. Running them on a rheostat will end in failure. AC pumps are inherently "harder" to control than DC, and the DC Tunze products have the advantage of coming with a driver that just needs a 0-8v DC signal, so you don't even have to design a driver, just come up with a way to generate the signal.
On large tanks with closed loops it's arguable that a "large" wet end fitted with a 3-phase motor and a VFD is cheaper/more capable than a bunch of powerheads but powerheads have the advantage that you can just stick them on a running tank without redesigning from scratch.
On large tanks with closed loops it's arguable that a "large" wet end fitted with a 3-phase motor and a VFD is cheaper/more capable than a bunch of powerheads but powerheads have the advantage that you can just stick them on a running tank without redesigning from scratch.